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TURBONutterLada Niva 4x4Service ManualFuel Injection

This manual and a host of other wonderful Lada Niva documentationis available free of charge at:http://www.turbo-nutter.com

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http://www.lada.co.uk/forumFor Lada parts, advice and general all round Lada wonderfulnessthese blokes aren't bad:Lada UK LtdAskew RiggTroutbeckPenrith, CumbriaCA11 OSZUnited Kingdom

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ENG INE M ANAGEM ENT SYSTEM S 1.7 l THROTTLE BODY IN JECT10N 2-101

SURGES ANDIOR CHUGG LESDefinition: Engine power variation, under steady throttle orcruise. FeelsIike the vehicle speeds up and slowsdow n, -w ith no change in the accelerator pedal.

PREUM INARY CHECKS Perform the careful visual/physical checks as described at start of "Symptoms." in t hi s se c ti on . B e sure driver understands air cond it ion ing ' c omp re s so r op er a ti on in owner 's manual. Use a Tech 1 "Scan" tool to make sure reading of vehicle speed sensor matches vehiclespeedometer;

CHECK: CHECK:

". - ....fU EL SY STEM

Fuel pressure while condition exists, use CHART A-7.In-line fuel filter. Replace:if dirty or plugged.

CHECK: CHECK:

IG NmON SYS TEM~~~~~~vJ:u~; '3 ' f~f~:: ' :=t. :~4~,;~~jabumed electrodes. orbeaVy depOsits-Repair o r r e p l a c e as n e c e s s a r y . - - - - -For misfire under load. U se C HA RT C -4C .CHECK:

ADomoNALCHECKS- - --CHECK:_'~:u~~~r!~~:~~~~~;~~~~~~gn~~nP~~~~~~~~~

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2-102 ENG INE M ANAGEM ENT SY STEM S 1 .7L THROTTLE BODY IN JECTION

LACK OF POW ER. SLUGGISH, OR SPONGY(Page 1 of 2)Eng ine de live rs le ss than expec ted powe r.L ittle or no inc rease in speed, wh en a cc el er ato rpeda l is pushed down pan w ay.

Definition:

PREU MIN ARY CHECKS Perform the c a r e fu l v isua l/ phys ic a l checks as described at stan of "Symptoms," in t hi s s ec ti on . C ompare custom er 's vehic le to similar unit. M ake sure th e custom er has an ac tua l prob lem . R emove a ir filte r and c he ck a ir filte r fo r din, or for b eing plugged, r ep la ce a s n ec es sa ry .

FUEL SYSTEM CHECK : F or contam ina ted fuel. CHECK : F or restric ted fue l filte r , or im proper fue l pre ssu re , use C HA RT A -7 .

JGNTnON'SYSTEM C HEC K: P roper ignition system volag eO utP ut with~rktester s 2 67 92 ( sT -I 2S ). CH ECK : Ignition tim ing . CH ECK : P roper opera tion of e lectronic spark. t iming.

EX HA UST SY STEM CHECK: Exhaust s ystem fo r poss ible rest ric tion: U se CHART B-1.

SENSORS CHECK: Man ifo ld a b so lu te pressure se nsor. U se C H A RT Col D . V a cuum hose b etw ee n e ng in e andmanifold absolute pressure sensor fo r kinks o r l ea ks .

vAZ. SERVICE MANUAL THROTILE BODY INJECTION NIVA


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. :ENGINE-MA NAG EMEN T' SY SJEM S t.7L . TH RO TTL E BODY IN .JECT IO N 2-103

LACK OF POW ER, SLUGGISH, OR SPONGY(Page 2 of 2)

Definition: Engine delivers less than expected power,Little or no increase in speed. when acceleratorpedal is pushed down pan way.

ENGINEMECHANICAl CHECK : Engine compression. Refer toEngiile Manual. CHECK: Engine' valvetiIl1irig~R-ef~ ~~ngipe, Manual. C :HECK : Engineior'prt;Per'OI"wti'rn:Camsha!iRe fert~ih1gtneManua1 ,

ADomONAL CHECKS CHECK : Electronic control modu le g ro un ds fo r being clean. tight. and in their. proper location.These ground Wires secure to th e engine block on the directignition systembracketuppermost boll -. ...., ... .... '. . .' .... .' CHECK: Ai fcondi tio rungD~ ta tio ri. .A i r,C( )il< fitioning chitchshouldttitoutatWideopert throttle, '.' CHeCK : A1tematoroutputvoJ.tage,~'ii~ssthan9 Of more than 16.9 volts.

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VAZ.SERVICEMANUAL THROTILE BODY INJECTION NIVA153


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2~104 ENG INE MANAGEMENT SYSTEM S 1.7L THROTILE BODY IN JECTION

DETONATION/SPARK KNOCK(P age 1 of 2)D efinition: A m ild to severe ping . usua lly worse underacceleration. The eng ine m ake s sharp m eta llick no ck s th at c ha ng e with t hr ot tl e o p en in g .

PREUM INARY CHECKS P erfo rm the ca re ful physica l/V isua l checks as desc rib ed a t sta rt of "Symptoms," in th is s ec tio n, M ake sure m e custom er ha s an ac tua l prob lem . R emove a ir filte r and check a ir filte r fo r din. or for b eing plug ged , repla ce a s nec essa ry.

COOUNG SYSTEM CHECK: F o r o bv io us o ve rh ea tin g problems .. CHECK: Low engine COOlanL CHECK: Loose water pump belt, CHECK: R estric te d a ir flow to ra dia tor. o r re str ic te d w ate r flow thru radiator . CHECK: Faulty o r in co rr ec t th en no sta t OI~CK: Correct c o ol an t s ol ut io n.

SENSOR GiECK: Co ol an t temp er atu re sensor. which may ha ve shifte d in v alu e.

, C ompa re c oo la ra tem pe re ru re se nso r r esis ta nc e to the "Diagnostic Aids" chan on Code14 or C ode 15 chart.

FUEL SYSTEM CHECK: Fue l pressure, use C H AR T A -7 . CHECK: F or poor fuel quality. proper octane rating.NOTICE : If Tech 1 "S can" tool readings a re norm al (see TECH 1 "SCA N ' TOO L TY P IC A L DATAVALUE list) and t h e r e a re no engine me ch an ic al fa ults ; fill fue l t a n k . with a fresh and prope r fue l forvehicle a nd e v al ua te vehicle performance.

OCTANE ADJUSTMENT POTENTIOM ETER A s buill a t th e fa cto ry th is adjustment was initiall y se t for p re miu m octane fue l. If low octane fuel isto be used on a reg ula r b asis, it is adv isab le to readjust th e oc ta ne ad justm ent pote ntiom ete r. U seCHARTe-iS.

THERMOSTATIC AIR C LEANER Ensure tnar the the rm osta tic a ir c lea ner func tions properly. C heck tha t the tem pera ture ac tua teddam per m oves away from "H OT A IR " position afte r th e eng ine is fully wanned up . U se the Tech 1"S can" tool to ob se rve intake a ir tem pera ture after the eng ine is fully warm ed up. A t road speedsthe intake a ir te mpera ture should be close to a m bie nt a ir te m pe ra tu re .

V AX SER VIC E M AN UA l TH RO ITL E B OD Y IN JEC TIO N N IV A

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ENGINE MANAGEMENT SYSTEMS 1.7l THROTTLE BODY INJECTION 2105

DETONATION/SPARK KNOCK,(Page 2 of 2)

Definition: A mild to severe ping. usuallyworse underacceleration. The engine makes sharp metallicknocks that change with throttle opening.

IGNIrIONSYSTEM CHECK : Spark plugs for proper hear range.". .

ENGINE MECHANICAL CHECK : For carbon buildup. CHECK : For in c or re c t b a sic e ng in e .p a rt s suchas c am , h ea d s, p is to ns , etc . CHECK: For excessive oil e nte rin g c omb us tio n c ham be r.

.. ..' .. ,.ADomONAl CHECKS

CHECK: For correct engine calibrator (see Service Bulletins). CHECK: For intake manifold electric heater should be "OFF" with the engine fully warmed up.Use Tech 1 to display "MANIFOLD HEATER" "ON/OFF" status.

VA2 SERVICEMANUAl THROmE BODY INJECTION NIYA155


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2106 EN GIN E M AN AG EM EN T SY STEM S 1.7l THROTTLE BODY INJECTION

HES ITA TION, SAG , S TUMBLEDefinition: Momentary lack of response as the accelerator is pushed

down. Can occur at all vehicle speeds. Usually most severewhen first trying to make the vehicle move, as from a stopsign. May cause the engine to stall if severe enough.

PRELIMINARY CHECKS Perform me careful visual/physical checks as described at stan of "Symptoms:' Inthis section.

CHECK:CHECK:

SENSORSThrottle position sensor. Use CHART CIH.Manifold absolute pressure sensor response and accuracy. Use CHART C~1D.

CHECK : For kinked or leaking vacuum hose between engine and manifold absolute pressuresensor.

IGNITION SYSTEM CH ECK : Spark plug wires for being faulty. CHECK: Spark plugs for being fouled. CHECK: Open ignition system ground. reference low circuit.

EVAPORATIVE EMISSIONS CHECK : Evaporative emissions storage canister system. Use CHART C-3.

F U E L SYSTEM CHECK : For restricted fuel filter or improper fuel pressure. Use CHART A-7.

ADD IT IONA L CHECKS CHECK : For correct engine calibrator (see Service Bulletins). CHECK : Alternator output voltage. Repair, if less than 9 or more than 16.9 volts.

VAl SERVICEMANUAL THROTIlE BODY INJECfION MVAlSi)

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ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJE(110N 2-107

C UTS O UT, M ISSESDefinition: S teady pulsa tion or jerking that fo llow s e ng in e spe ed, u sua llym ore pronounced as eng ine load inc reases. The exhaust has aste ady spir ting sound a t id le or low speed .

PREUM INA RY CH ECK S P e r form the ca re ful visua l/physica l 4 tecks _a s d e sc r ib e d atstart o f "S ym ptom s." in this se ction .

IGNmON SYSTEM CH ECK: F or cylinde r m iss by :

1. Stan engine . allow engine to s ta b iliz e th en d is co nn e ct idle a ir c on trol m oto r. R e mov eone spa rk p lug w ire a t a tim e. using insulated pliers .2 . If the re is a revolutions P e r m inute drop. on a ll cylinde rs (equa l to w ithin 50revolu tions pe r m inute ), g o to "R ough. U nsu.b le O r Incorrect Idle . S ta lling"sym ptom , R econnec t id le a i r contro lmotor ; , ...3. If thez:e isnorevQ.l~ot lSper' : '91i lP.Iteciropon O n e ormore c yl in de 'r s;o r e x ce ss iv e.variation in4 ro p;'c h ec k ,f ur sp a i'k ; 'o n)J )C s us pe c te d c yl in de ns ) with J 16792 (ST-125)Sparlc.T~. If 00 ~ u s e 0iAR'r C-4.lf there is spark . remove spark plug(s) inthese cylinder(s) and check for:

- I ns ul atio n Cracks- W e a r- Im proper Gap- B urned Ele ctrode s- H eavy D eposits

!CHECK: F o r e xc e ss iv e spark plug w ire resistance.NonCE: Ifthe previ9us~,didnot~ . I h e . l > r Q b 1 e r n :

-Visually Inspect ignition sysi~iJ{iorJlloi.Sttin::, dust . cracks. bums . etc. With e ng in e r un nin gspray plug w ir es W ith fine watetmist fi)cheCk forshorts. . .

FUEL SYSTEM CH,ECK: F or contam.i.nated fuel o r r e st ric te d fuel f il te r o r in co rr ec t fu el p re ssu re . U se C HA RT A-7 .

E N G I N E ,MECHANICAL GIECK: F o r p ro pe r v -. Iv e ,~V ) g .,-,R ~ aV e iO c k er co ve t ',Cleek for, wornrocker arms. broken orweak valve sprilig s,W O mC am shaftlob es;R epa ir a s nec essa ry. R efe r 10 E ng in e M a nu al. CHECK: Low com pression, P erform com pression check . R efe r to Eng ine M anua l. CHECK: Intake and exhaust m anifo ld passag es for casting fla sh .

V~ SERVICE MANUAL THROTTLE BODY IN JEC TIO N N IV A


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2108 EN GIN E M AN AGEM EN T SY STEM S 1 .7 l THROTTLE BODY IN JECTION

POOR FUE L ECONOMYDefinition: Fuel economy. as measured by an actual road test.is noticeably lowertnan expected. Also, economy is

noticeably lower than it w a s on this vehicle at onetime. as previously shown. by an actual road test.

P REUM IN AR Y C HEC KS Perform the careful visual/physical checks as described at start of "Symptoms," in this section. Check air cleaner element (filter) for dirt. or being plugged. Visually (physically) check: Vacuum hoses for splits, kinks, and proper connections. Perform "Diagnostic Circuit Check,"- Is air conditioning "ON" full time?

- Are tires at correct pressure?- Are excessively heavy loads being carried? .- Is acceleration too much, too often?NOTICE: Suggest owner fill fuel tank. and recheck fuel economy;

IGNIT10N SYSTEM CHECK : Spark. plugs. Remove spark plugs, check for wet plugs, cracks, wear. improper gap,burned electrodes. or heavy deposits. Repair or replace as necessary. CHECK : Ignition wires for cracking. hardness, and proper connections.

I FUEL SYSTEMCHECK : Fuel pressure. use CHART A7.CO OU NG SY STEM CHECK : Engine coolant level. CHECK : Engine thermosw for faulty pan (always open) or for wrong heat range. Observe Tech 1"Coolant Temp" with engine fully wann at road speed.ADOmONAL CHECKS CHECK: For correct engine ca l ib r a to r i ns ta l led in electronic control module. Observe Tech I"Calibration ID."

CHECK : For proper calibration of speedometer. CHECK : For dragging brakes.O aA NE A DJU STM EN T PO TEN TIOMETER

If premium octane fuel is being used. use Tech 1 to observe "Octane AdjUSL" With premium octane fuelthe "Octane Adjust" value displayed on Tech 1 should b e 0. Use CHART Ct5.

SENSORS CHECK : Coolant temperature sensor or air temperature sensor which may have shifted in value.Compare coolant temperature sensor resistance to the "Diagnostic Aids" chart on Code14 or Code 15 chart,

CHECK : Manifold absolute pressure sensor. Use CHART Cl D.VAZ SERVICEMANUAL ~ROTTLE BODY INJECTION NIVA

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ENG INE M ANAGEM ENT SY STEM S 1 .7 l TH RO TTLE BODY IN JECTION 2109

ROUGH, UNSTABLE OR INCORRECT IDLE, STALLING(Page 1 of 2)

Definition: The engine runs unevenly a t idle. If bad e no ug h, th e vehicle maysha ke . A lso, the e ng ine idle spe ed m ay va ry (c alle d "hunting ").E ith er c on ditio n m a y be se ve re e noug h to c ause sta lling . E ng ineidles at incorrect speed.

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PRELIM IN ARY CH ECK S Perform th e c ar ef ul visual/physical checks as described at stan of "Symptoms," in th is s ec tio n.

SENSORS CHECK : Throttle position sensor- Use CHART C-IH. CHECK : Coolan t t empera ture s e n s o r - U sing a T ech 1 "S can" tool, com pare coolant temperaturewithambienrtemperature on a cold eng ine . '

-lfcoolanttemperaturereadi~g i O c : _ g ~ r t h a J : l , o r Iess thanambient air temperature .Check fo r high resistance in cootam temperature sensor circuit or se ns or itse lf.Compare.resistancevahieto "t>iagnostic Aids" on Code 14 and C ode 15 chart . CHECK : M an if old ab solut~ 'P r c s s:w .e " se~ 'o r ~ ' s p O t t S e and a c c u r a c y . manifold' absotute pressuresensor v acuumhose. u se CHART ' C -I O .

CHECK :

FUEL SYSTEMEvaporative Emission Control, System. Use:CHART C3.I nje cto r fo r leaking:_ari~iii:ie , f u e I ; s y S t e n i b y ' b i t h e r turning the ignition key to the "O N "posi tion which 'will pres$tirire the fuel system Jor,,2 secondsor by, appJying battery, . vo lta g e [0, the, fuel:MPtesl:tcrttllnaI.{Asscmbly Jine :data link ter:m.inaI"G".) Applyingb a l t e r y v o l ~ a g e ;W l J r ' t o r i : : ~ : t h ~ : f U ~ F ~ m p io 'h in , u r i t l l :t l i e b a t t e r y v o l t a g e is ' r e m o v e d ., ' ,Visual ly,checkinjeCtot and thI'ottiebody , inject:i .on.assembl y for fuel leakage. Refe r toCHART A 7 "Fuel System Iliagnosis." 'F ue l pressure , use C H AR T A -7 .

CHECK : CHECK :

IG N ITION SYS TEM C HEC k: Ignition system for:"P ro pe r ig nitio n voltage outpUt with spark tester J 2 67 92 (S T 1 25).Spark plugs. wet plugs. c ra ck s. w e a r, improper gap. b u rn ed e le ctr od es o r heavydeposits.Spark plug l ea ds /w ir es fo r e x ce ss iv e r e sis ta nc e .Bare and shorted wires.Crankshaft sensor resistance and connections.Loo se ig n iti on c oi l c o nn e cti on s.

For misfire at idle. Use CHART C4B.CHECK :

v s a . SERVICEMANUAL THROTTLE BODY INJECTION NIVA'59


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2-110 ENG INE MANAGEMENT SYSTEM S 1.7L THROTTLE BODY IN JECTION

ROUGH, UNSTABLE OR INCORRECT IDLE, STALLING. .(Page 2 of 2)

Definition: T he e ng ine r un s unevenl y a t id le . If b ad enoug h. the ve hic lem ay shake . A lso. the eng ine idle speed m ay vary (ca lled"hunting"), Either c on ditio n m a y be severe enough to causes ta ll in g. E ng in e id le s at i nc o rr e ct s p ee d .

ADDITIONAL CH ECKS CHECK: V a cu um le ak s can cause bigherthan normal i dl e s p ee d s. CHECK: Idle a ir c ontrol op era tion, u se < ; : H A R T C -2C . CHECK: Electronic control module g rounds for clean. tight. and in their proper location. Theseground wir es s ec ur e to th e engine b lock on the direct ig nitio n s yste m b ra ck et uppermostb olt. T his b olt w as p re viou sly used to retain th e distributor on a c arb ure te d e ng ine .NOTICE: U se Tech 1 "S ca n" tool to de te rm ine i f e le ctro nic c on tr ol m od ule is r ec eiv in g a ir c on ditio nin grequest signa l. If prob lem exists only with a ir conditioning "O N ," check. a ir conditioning system forovercharg e or undercharg e of R 1 2 re frig erant system . CHECK: B atte ry cab les and ground straps should be c le an and s ec ur e. E rr atic v olta ge will causeidle a ir c o nt ro l to change its p ositio n. r es ultin g in p oo r id le qual i ty . . GIECK: Idle aircontrol va lve w ill not m~e. i f s y s t e f u voltageisbelow 9 or . g rea te r than 16.9~~ . .. . CHECK : C r a nk c as e v e nt il at io n system f or p ro pe r o pe ra tio n ( se e '; CHARTC -1 3 ).

ENG IN E M EC HAN IC A L CHECK: F or b ro ke n motor mounts . CHECK: P erform a compression check.. Refe r to Engine Manual.

V /!0 2. S ER VIC E M ANU AL T HROT TL E aoov IN JECT IO N N IV A

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ENG INE MANAGEMENT SYSTEMS 1.7 l THROTTLE BODY IN JECTION 2111

EXCESSIV E EXHAUST EM ISSIO NS OR ODORSDefinition: Vehicle fails an emission test. Excessive odors do

not necessarily indicate excessive emissions.

PREL IM INARY CHECKS Perfo rm ,.Diagnostic Circuit Check." If EMrSSlO~ TEST shows excessive carbon monoxide and hydro carbons check items wluch causevehicle to run RICH. Make sure engine is at normal operating temperature. If E\1IssrON n:ST shows excessive oxides of nitrogen check items which cause car to run LEA;';or too hot.SENSORS CHECK: .Manifold absolute pressure '~ensor bseCHART Cv lD to check the manifold absolute.pressur~ sensor.

NOTICE: If the Tech 1 "Scan" tool indicates a very high coolant temperature and the system is runningLEAN: Check the cooling system and COOlingfan for proper operation.

FUEL SYSTEM , CH ECK:>For proper fuel cap. CHECK: ,Fuel pressure.use CHART A 7., N OTIC E: If test shows excessive oxides ofnitrogen, check items which cause vehicle' to run LEAS or. . r o o hot. .: .' CHECK: Canister for fuel loading. Refer-to CHA .RT C-3.IG N ITION S YSTEM CHECK: Ignition system for:- Proper ignition voltage ouiput with spark tester} 26792 (ST125).- Spark plugs.wet plugs.cracks; wear, improper gap. burned electrodes or heavydeposits,

- Spark plug leads/wires for excessi ve resistance.- Bare and shorted. wires.- Crankshaft sensor resistance and connections..- Loose ignition coil connections.ADD ITIO NA L CHECKS CHECK: For vacuum leaks. CHECK: Carbon build-up in combustion chambers. CHECK: Crankcase ventilation system for proper operation (see: CHART C-13).

VA2.SERVICEMANUAL THROTTLE BODY INJECTION NIVA


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2~112 ENGINE MANAGEM ENT SYSTEMS 1.7L THROTTLE BODY INJEcrlON

DIESEL ING, RUNONDefinition: Eng ine continues to run afte r key is turned"off," but runs v ery r ou gh ly . If eng ine runssm oothly, check: ignition sw itch and adjust-m e m o a nd short [0 voltag e on ig nition sw itchv ol ta g e in pu t c ir cu it

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PREUM INARY CHECKS P e rform the ca re ful visua l/physica l checks as desc rib ed a t stan of "Sym ptom s," in th is secuon.

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F UEL S YS TEM CHECK : Injec tor for leaking . Energ ize fue l system by e ithe r turning the ignition ke y to me "ON"position which will pressurize the fue l system for 2 seconds or by applying ba tte ryvoltage [0 the fue l pum p test terminal. (A sse mb ly line da ta link te rm ina l "0 "'.) A pp lyingb atte ry v olta ge will force the fue l pump to run until the b a tte ry voltag e is removed.

V isua lly chec k injec tor and thrortle body inje c tion assem bly for fue l le akage . R efe r toCHART A-7 "Fuel S y stem D i ag n os is ."

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ENGINE MANAGEMENT SYSTEMS 1.7l THROTILE BODY INJECTION 2-113

BACKFIREDefinition: Fuel ignites in intake manifold, or inexhaust system . making a loud

popping noise,

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I PR EL IM IN ARY CHECKSP erform the careful visual/physica l checks as described at stan of "S ym ptom s," in this section.IGNITION SYSTEM

CHECK : Proper ignition coil output voltage with span tester J 2 67 92 (ST-1 25 ), CHECK : Spark plugs. Remove spark plugs. check for wet plugs, cracks. wear. improper gap,burned electrodes, or heavy deposits, repair or replace as necessary. CHECK : For defective insulation on the spark plug wires or boots. This would allow high voltagearching to engine pans, mostly noticeable during acceleration. CH E CK : For cxcessive spark plug wire resistance .. CHECK : For crossfirebetweenspark plug wires. (proper routing of plug wires). Refer to EngineManual. _. ',- ,

ENGINE MECHANICAL CH EC K: P e rform a com pression check. Refe r to Engine Manual, CHECK : Valvetiming. Remov e.r oc ke r.c ov er .C h ec kfo r w or n rocker arms. broken or weak valve

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2-114 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJEalON

CHART 8-1RESTRICTED EXHAUST SYSTEM CHECK

CHECK AT OXYGEN SENSOR:t Carefully remove oxygen sensor.2. Insta II exhaust backpressure tester (BT-8515V) or equivalent in place of oxygen sensor (seeill ustr ation),3. After completing test described below, be sure to coat threads of oxygen sensor with anti-seizecompound or equivalent prior to re-installation.

, BAOC PREsSURE GAGe2 OXYGEN-siNSOR(OiS)l EXHAUST MANIFOlD 153338-'E

DIAGNOSIS:t. With the engine at normal operating temperature and running at 2500 revolutions per minute,observe the exhaust system backpressure reading on the gauge.2. If the pressure exceeds 1 1/4 ps i (8.62 kPa), a restricted exhaust system is indicated.3. Inspect the entire exhaust system for a collapsed pipe, heat distress, or possible internal mufflerfailure.4. If there are no obvious reasons for the excessive backpressure, a restricted catalytic converter should

be suspected, and replaced using current recommended procedures.

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EN G IN E M ANAG EM EN T S YS TEM S 1 .7L TH RO TIL E BODY INJEalON 2-115

ELECTRON IC CONTROL M ODULE PIN CONNECTOR "A " SYM PTOM S CHART24-PlN A-8 CONNECTOR

This electronic control module symptoms chart is for use with a digital voltmeter to further aid indiagnosis. The voltages you get may vary due 10 low battery charge or other reasons, but they should bevery close.BACKPROBE CONNECTORS ONLY!

THE FO LLO WIN G CO NP IT ION S M UST BE M ET BEF ORE TESTING : Engine at operating temperature Engine idling (For "Engine Run" column) Diagnostic "test" terminal not grounded Tech 1"Scan" tool not installed Air conditioning "OFFn Digital voltmeter ",_ .. (negative) lead cOrinected toa good clean ground point.

.. ,PINfUNc: ryON

' .-.a.;.....COPES. ." fECT . P OS SI!lU S Yr.'lP TO MS F RO MFAU~TY.ORar lT .

.u NO . CONNECT ION., N O NE l I : O S T A A T . : S U C HA ATA .7 . PU MP R uN SALL THE TIME( 11) .

A .J P UlS E W ID THMODULATo.RCAN IS TE R CONTRO LGREENIYELLOW o NONE F UEL LO SS OR FUELVA?o.R 0 0 0 .1 1 . . POCRID U. S TA LU NG . P OO R D RN EA BIU TY .

A4 NO CO NN ECTlo.NA S ~ CH EC KEN GIN E-' L I G H T CONTROL BLACK!. , 'W HiTi . INST fIVMENT,;ANKcuimk o 8 + NO . C l- IE CK , ENG IN E L IG H T (8 ). U GHT -ON":.l\iiTKETtM~, DOES NcHWH COOES ' .'(lo;'.SU 'O IA GN OS TlC C IR CU IT < ~EC IC - .:A l i , I GN rr JON sWlTCH,voc TAG~IN; iUT

S IGNAL..53>" 'N tI ST AR :'i "; 'N C ) c H etK e NG IN e UGHT. NOSERIALPATA(8) . fu$E BlQwN (10). SEE,-D iA GNO sTIC C lRCU tTQlECK:": "

.ENGINE wiu NOTSTOPJl .UNNIHG. (In.A7 NO CONNE CT ION

... : ..

AS S ER IA L OATACOMMUNICATIONS ORANGE A SS EM Il V UN fDATA UNK-M 2-'5 2-5V .tAYING V ARYlN G NCNE NO . ASSEMB~V UNE QATA ~INK ORWIUN OT F LA SH coos 1 2 G l.se E -D IA G NO ST IC C IR CU IT C H EC K :. A9 DIAGNOSTIC TE ST T ERM INA LI NP U T S IG NA L

BLACICIWMITE A S,S EM al V U H EDATAUHK, 5 5 NO ASSEM BLY UN E D ATA UNK OR WILLNOT FLAsH CODE 12 (8), . ,F lA SH ES C OD ES. H IG IH PEEO FA N IS O N.( IOJ . SE E -o I AGNO ST lC C I! \C U I TCH EcK:

.. ... .A l0 . V E HI CL E. S PE ED IN PU T S IG NA L V E i uC L E S P E E D, S iNsoR-Z- :ENGINe MAYstAl l . AT COA STO ~.:'r'EOIlst.AI'I v E... IC LE~ E D D OES N OT: t. 4~ lc ! :l ~ ~e _ o, q, ;. tE :' rE R (9 , I ll .GREEN

A IC ooLA ...T , ' .rs MPERATUIUANO lH~OriLEPO~ ;' It ION SENs oRGROUND." .'

. CCO ,LANT' .. , .. ' ,: .,'.:0"'0-,T E M P E R A T U R E ". SENSOR -A-"THROTT1.El>OSmONS EN SO R -8

, I S :: ; ' ,}IIGH lOU. RauCH.IDLE. HAAOTO START;21.(8) I 'OOR;eIU 'OR, . .ANCE; EXCeSSI'IEE X HAli S T EMISSIONS (8) .

A 1 2 E LE CT RON ICC ON TR OL M OD UL EGROl JNOA SS EM 91 Y U NEOATAUNKA

0 NONE -Air A ND -0,- OPEN NO STA I'IT(8).P OO R G RQU NO S P OO R P ER fO RM A NC E.S Ee -O IA G NO ST IC C IR CU IT C HE CK :

Battery voltage for first twoSKonds. ;l.fier ignition is turnedON"withoutCr.!inking the engine.When vehide isstOppicl. voltagewill be either'nthan 1 volt org~atler than 10 volts; depeiidlngupon ' pos it ion of drw. Wheels. Whenvehide i$ moving. volt.age wlll varydepending upon vehicle speed.Varies with tefT! perl tun!.

Varies. With Jgi'lition -ON- readsb a r O n M t r I c p r e s s u r w . WIth. engineNnning,lUdiengiMkMd ."Voltage will vary With engii\e~luUOni pef minute . .De,pendlng On octane adj lolStpe)te \1 'UQmeter trim.bttery vOlt.ag. (8 +)with enginewann.Open.

2 567

J 8

9 Open/Grounded circuit;0 Gri::HJndeddrcuit.11 Short to +12 varts. wstha:ii O.SOvolts.... leSS tnan 0.'0 volts. Air Conditioning Vehicles OnlyB+ should equ;l.lbattery voltilge.

9-17-92NS 14374

V Al. SERV ICE M AN UAl rnR OTTLE BO DY IN JEC TIO N NIV A'65


17/48

2-116 ENG INE MANAGEMENT SYSTEM S 1.7 l THROTTLE BODY IN JECTION

ELECTRONIC CONTROL MODULE P IN CONNECTOR "B" SYM PTOM S CHART24-PIN A-S CONNECTOR

This electronic control module symptoms chart is for use with a digital voltmeter to further aid indiagnosis. The voltages you get may vary due to low battery charge or other reasons, but they should bevery close.BACKPROBECONNECTORS ONLY!

THE FQllQWIN~ :tQNDITlQNS; MUST BE M E T BEFQRETESTlNy: Engine at operating temperature Engine idling (For "Engine Run" column) Oiagnostic "test" terminal not grounded Tech 1 "Scan" tool not installed Air conditioning "OFF" Digital voltmeter


18/48

:

-' ".;t " .

, -

'

,ENGINEM ANAGEM ENT SYSTEM S 1.7L THROTTLE BODY IN JECTION 2117,

ELECTRONIC CONTROL MODULE PIN CONNECTOR e"SYMPTOMS CHART32-PlN c -o (ONNEO'OR

This electronic control module symptoms chart is for use with a digital voltmeter to further aid indiagnosis. The voltages you get may vary due to low battery charge or other reasons, but they should bevery dose.BACKPROBE CONNECTORS ONl Y!

THE, fOLLOW ING (ONpmONS MUST SEMET BEFORE TESTING: E"gine at operating temperature Engine idling (For "Engine Run" col urnn) Diagnostic "test'" terminal not grounded Tech 1 "Scan" tool not installed Air conditioning "OFF" Digital voltmeter : (negative) lead connected to a good clean ground point.NOMAL VOlTA(i

C1" " N o Cci~fCTioN, 'IGN ENG . CO DES"O N '" ' !tUN AffECf .WIRECOL04 l P OS SLBLE S YM PTO MS F RO Mf AULTY C I tO J lT

C2,~~~~t:rA~f:,.::~~RELAY CbN!itO l ',,:' ,-, :B+ (I) "1+, ~NE_ ", -NOT , . , ' U S I : . . . a u ' 3S _NO T USEABLE 35NO T U S E A B L E 35NO T USEABlE 35

," "

,.(4)1,..2 j",,'2 "i4,' \.5:

COL.D O RIV , A8 LU TY C OM P LA I N T'S _

" C3JO lEA III: CON tROLCOILa lOW '" ' ';lOuAli .....CONTROl VA.l .VE'~ ,A. G RE EN t. 8 LAOc :'C4 IOLE A lII. CONTROL GREENIc arlS HLGI"I . WHITE -,DLEAIl ..CONTltOl VALVE "a C S . -lD U A IR C ON TI! .b l BLUE!C OiL "A toW' BLACK IDlE ..CONTROL VAL 'l l: "COC6 !OLE AI R CONTROL BlUEJ. ' CO I lA"H IGH WHITE I OL E A IRCONTROL V AL Vi "0

. c , c a , . ";N O< QN ~c r1 6N -.; ...._ .. . C? "N()CONNE9LON

C I , O : - C O O t. . A N T ' . . :. 'T tMj i~RAruRe. ,_ ,. .. IN Put SIGNAL" cu. . MANIFOLD ABSOLUtE,' P i t ES-SuR.E .. ... . INP UT S IG NAL

.::: : .

P OO l! . P ER FO RM A NC E. H IG H IO LE(9)SE E CHAltT C l H . - LiA RD TO sr AR TWHEN COLD (In....SURGE. f tUNSR.OUGH"HIGH IDLE.HMO TO STM T,ExcnsN E IX MA USTE M ISSlONS' O t O O O R S : . foO~.: ,P~~OR~CE;ftOVGl t i t lL{9J;

-'. ', .: .: :;:>,~.. _ B+ Nq~E

. ; " :. c ls ':

9 OpenlGrounded cin::uit.10 Grounded circuit.11 Short to +12volts. leSS th.an 0,50 votu. iRu.than 0,10 votu.u* A ir Conditioning Vehicles OnlyB+ Should equ.d b -a tte ry v otta ge .

16 ,


19/48

2-118 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION

ELE CTRON IC CON TROL MO ()U LEP IN CONNEC TOR "0" SYM PTOMS CHART3 2-P IN CoO CONNECTOR

This electronic control module symptoms chart is for use with a digital voltmeter to further aid indiagnosis. The voltages you get may vary due to low battery charge or other reasons, but they should bevery close.BACKPROBECONNECTORSO NL Y!

I tI~ EQ! ..LQW IH~&QHQI IIQHS MUST 81;MH ~EEQRf IfSTIN~; Engine at operating temperature Engine idling (For "Engine Run" column) Diagnostic Ntest'" terminal not grounded Tech 1 "Scan'" tool not installed Air conditioning "OFF" Digital voltmeter .._ .. (negative) lead connected to a good clean ground pointCOMPONENT f !IIO RM AlV Ol T AG EW 1R,E CONNECTOR IGH E~C;; CODE;S P OS SIB LE S YM PT OM S F RO M

P IN fUNCT ION (OtOfl CA'IITY -Otr RUN ' 'AfFECT. FAULTY O I ICU I T"01 H E C TR O NK IIROwN ENGINE .j)~. 0- NONE A12 AN~ , '01 ' OPEN; NO STAAT,CONTROL MODULE GII:OUNO H E 'O IA GN OSTIC (IR(UIT C MEC X:GROUND SE E T ERM INA L 'A 12'02 O CT AN E A DJ US T BLACI ( O CTANE A DJ US T -3 - 0- 0 54.33. R OU GH OR U NSTABLE ID LE. M AY STA LLPOTENTIOMETER, M AN ifO lD A BS OlU TE 2J OOR P EP. FO RMAN ce (a)M AN IF OlD A BS OLU TE I 'RESSU lI .E 'A ' HE OIARTCl0PRES SURE S ENSOR AND M AN IF OLD AIRt NT AJ (E A lII T EMP ERA TU II E T EM PE RA TU ItE A 'S ENSO fI G ROUNDD) NO CONNECT ION04 eLECTRONIC G R u N t 6,'IN (5)0 1.12 42 HMO TO , ST A AT , S TA LL S, W I LL 'lI. ES TAR T I NS PA AK T tM NG WHITE C ON NE CT OR 'C ' BY P~ M OOE , SH qV .A TC4j9).OUTPUT STALLS, P OO flIO LE, M AY ss r c coe 42{inos IGNmON MoOULe SLA(", 6.l>IN 0- 4, 6 42 LACK OF PWER .POQA f' ERFORMANCE ",SYPASS CO ,NT II Ol WHITE C ON NE CT OR 0 (9 , 1 1) IIY .P AS S M OO E,S EE (M AR T (4 ,D6 O XY GeN S EN SO R BROWN ENGINE 0 - O' 13 OPEN LOOP . HCH 1 R EADSGlI.OUNo GROUNQ FIXED 400- 50 0 mV (9).01 OXYGEN SENSOR PINI( OXYGEN .4SmV .1-.9mV 1] O PE N LO OP . S TR ON G E X,"A US T O OO P. ~ )IN PU T S IG NA L SENSOR08 NO CONNeCTION09 IN Je aO R C 1R ClJ IT SLACK E LEC TRON! ( CONT lt Ol 0 0 NONE N O s TA AT (8 . 1 1). MAY D AM AG E E LE CT RO NICC UR RE NT UMIT EO J UM PE II: MODUU"OIO C ON TR OL M OO UL E O R IN JE CT OR (1 0)D 10 I N J s cr O f! 0 11 C .lJ IT " - 8 L A O : ELECTRON IC CONTl t at. 0- 0", - NONE NO STA At(8 ,11), M AY OAM AG E ELErnO NICC UM EN T L IM IT ED J UM PE R' .. MODULE 09- (ONTltOl Moouu O R IN ,J eq Oll:O O) .011 NO CO NNC TlO ,N '.012 A lII CONDJTlONING B(UE A IR CDNOmON I~ 0-' 0' NONE NO A J R CONOITlONING ( 8 . II).C OM P "E SS Of t C ll1 T~ ItELAY,2 A IR (O NO IT IO NIN G R UN S A LL J l.IE T IM E (1 0)R EL AY C ON TR OL013 NO CONNECT IO N0', NO CONNECT IO N015 NO (O NNeC TIO N016 F UE L IN JEC TO R BLUE ELECTRONIC CONTltOL 8+ B. NONE IF '01" IS OPEN, NO STAAT, SEE C HAATCONTROL MODULI:016 A -3 . F LO OO E NG IN E. F AIL E LE CT RO NICC ON TR OL M OO UL E O R IN JE CT OR ('0),N O S TA RT (1 1),

S Voltage will v~ryw)th engine 9 Open/Grounded drcult. 3 2P IN CO CO NNE CTO Rrevolutions per minut 10 Grounded circuit. A -0 IIII I I I6 Dc!pending on OCUne adjust Short to +12 volts. .J N. I I I H J lilt! r 1 4potentiometer t rim. " z s un 1 1. n II " ' _ . _ I I II..7 Battery voltage (8 +) with engine t..essth.lln O . S O volts. I ;III JI I Iwarm, t..essth.an 0,10 vorts ))'l1{(8 Open. B+ Should ~U.l I I o.attery voltage. BACK V IEW OF CONNECTOR6-29lNS 14 177

V~ SERV ICE MANUAL THROTILE 80DY INJECTION r:-'IVA

.' ~:;.~

-

" .. J- . i ,


20/48

hartC-15 Octane Adjustment Potentiometer Check 2146

,ENG INE M ANAGEM ENT SYSTEM S 1.7L TH RO TTLE B OD Y INJECTlON 2119

S ECT ION 2 .9C

COM PONENT SY STEM CHARTSCONTENTS

.' ;'" Page . ~ : ! ~ : ~ ~ : : ~ t : 1 t ~ ~ : : : : = = = = = = ~ = = ~ ~ ~ ~ ~ : ~ = =Chart C-2e Idle Air Control Circuit Check _ 2124Chart C-3 canister Purge Valve Check ..: _ _ 2-126Chart (-4 Ignition System Cleek (No Spark) _ .2-128ChartC4 Direct Ignition System Misfire M..J4ll 2132

'.. :;Cha,rt ,C-4C' ,Oi~"lgnitiC)fl's)'$f,e"' , , . . i s f i " , Under Load _ ~, ;2.136,_'.' 'C:~~rtC.9 -Intak'e ManifOld EtedricHeater : 2138 - " .'~~~rt~~10 ",- ':Air,C()Oditiol1ingcqrpp~r , g u t c h C()ntrol... , ~ 2.1~.". :(:har t::~~13 .Crankcase ,ventilatiOn' s y s t e ~ C h e c k . _ ~ , , .2144

V A2. SE RV IC E M AN UA L T HR OT TLE BO DY IN JE CT IO N N IV A169


21/48

2120 EN GIN E M ANAGEM EN T S YS TEM S 1.7L TH RO TTL E BODY INJEcrJON

MANIFOLD A8S0lllTEP RES SURE S EN SOR

, .. . . - - - - - - - - - - . ,TOTHROnu IIPOSIl lQt4 SENSOR I. . .- - - - f - - - - - . . .,r - - i O " ' O C T A H E A O J U S T M E H T A ' j , j O - - ,I IN TA K E A lk T lM P t:M TU I! S EN SO lI; I~ - - - - - - - - - - - - - - - - - - - - - - ~

MAN!FOLDA8S0lUTEPRESSURE

9-H..92NS 14366

ELECTRONICC ON TR OL MODU LE

+ S V OLT S R EF ERENCE7S GRAY41 G REEN69 8LAO:

SENSORGROUND

CHART(-10MANIFOLD ABSOLUTE PRESSUREOUTPUT CHECK1.7L THROTTLE BODY INJECTION NIVA

.:. :.~Circuit Description:The manifold absolute pressure sensor measures th e changes in the intake manifold pressure which result fromengine load (intake manifold vacuum) and revolutions per minute changes; and converts these into a voltage output.The electronic control module. sends a 5 volt re fe re nc ev olta ge to the manifold absolute pressure sensor. As memanifold pressure changes, the output voltage of the sensor also changes. By monitoring the sensor output voltage,the electronic control module knows the manifold pressure. A lower pressure (low voltage) output will be about 1..2volts at idle. While higher pressure (high voltage) output will be about 4-4.8 at wide open throttle. The manifoldabsolute pressure sensor is also used. under cer tain conditions. to measure barometric pressure. allowing theelectronic control module to make adjustments for different altitudes. The electronic control module uses themanifold absolute pressure sensor to control fuel delivery and ignition timing.

Test Description: Number(s) below refer to circlednumber(s) on the diagnostic chan. .Ill Important Be sure to use the' same diagnostic test equipmentfor all measurements.1. Checks manifold absolute pressure sensor outputvoltage to the electronic control module. This volt-age. without engine running. represents a barometerreading to the electronic control module. Com-parison of this barometric reading on th e same daywith a known good vehicle is a good way to checkaccuracy of a "suspect" sensor. Readings should bethe same O.2 volt2. Allowing 0.34 BAR (10" Hg) vacuum to the mani-fold absolute pressure sensor should cause thevoltage to be at least 1.2 volts less than the voltageat Step l.Upon applying vacuum to the sensor, th echange in voltage should be instantaneous. A slowvoltage change indicates a faulty sensor.

3. Check vacuum hose to sensor for leaking orrestric ..tion. Be sure no other vacuum devices areconnec tedto the manifold absolute pressure sensor hose,NOnCE : The engine must be running in thiS step orthe Tech I will not indicate a change in VOltage.It isnormal for the "Check Engine" light to come "ON"and for th e system to set a Code 33 during this step.Make sure the code is cleared when this test iscompleted.

4. Disconnect sensor from bracket and twist sensor(BY HAND ONLY) to check for intermittentconnection. Output changes greater than 0.1 voltindicate a faulty connector or connection. If OK.replace sensor..

.-I,)

:.':1. . . .

....i

1 7 ( " ;

VAZ SERVia MANUAL THROTILE BODY INJECTION NIVA


22/48

ENG INE. MANAGEMENT SYSTEMS1 . 7L THROTTLE BODY INJECf IO N 2-121

CHART C-1DMAN IF OLD ABSOLU TE P RESSUREOUTP UT CHECK1.7L THRO TILE BODY INJECTIO N NIV A

-NOTE: THIS CHART APPLIES ONLY TO MAP SENSORS HAVING

GREEN OR BLACK COLOR KEY INSERT (SEE BELOW).. i~

IG N ITIO N "O N ." EN G IN E N OT .UNHING. C O NNECT TE C H 1 ~ S(,t.H " TO OL SELECT ".Fa: D ATA U Sl." TECH 1 SHOULD IN D IC AT E A MANIFOLDA.soum: P RE SS UR E S EN SO ft V O LT AG E. C OM ' AlII.( THIS READING WITH THE R EAD ING OFA KNOWN GOOD vtMICLE. SE lFAC ING PAGE TIST D[Sal~N. nu1 . Y O LTAG E READ IN G SHOULD IE WITHIN t UVOLT .Ism

o .OISCONNECT AND PLUGYACUUM'SOU.Cl TOMANI'OLD AIISOLU1t REPLACEMANIFOLD AlSOLUn:I'.ESSURUEHSoa. .. ,' '. , . ". '. ". . p kESSURE SENSO Il . C O NN ECT A ,HAND VACUUM PUM P TO M. \H I FOLD SOLUTl'RESSUREStNSOA .- "." .. . ". 'STAATENGiNE~' . NOTE MANifOLD AlSOlUn P t l: lSSU I lt : SENSO ,, " VO\.TAGL AfflY CU4 ..... (10 HI) OF VA C UUM ANONon VDLTAGE04 :ANGL

SU '~C T SECOND "U D IN G 'ROM THlf .ST. VOLTAGE Dl f fER tNC lVALUE SH OU LD IE G REA TER 1 lC AN U V OL n.Ism

..

.." -.

(t) ' O t E C I C SENSOICC:ON,.EqibN.1F,OK,II .EitLACE, MANlfOi.D.uSOLUTt'RUS~E SENSOR. .'

HOT-STAMPED.NUMBER

7," COLORKEYED I NS ERT

LS 904S-6ELS"'HE Figure 2 Typical Hot-Stamped Numberigure 1 - Typical Key Insert9-1792NS 14379A FT ER R EP AJR S,P START ENG INE, CLEAA COOES AND CONARM NO KCHECIC ENGINEK UGHT.

VAZ SERV ICEMANUA l T HROT IL E BODY IN JEGIO N N 1VA


23/48

2122 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJEOION

lllROmEPOsrnONSENSORHR.OmE POSmONSENSOR . CONNECTORfront faceview

ELECTRONICCONTROL MODULE

-

1 " - - - - - - - - - - - - - ,TO IIA S SO LU li M . ...NIFOlD IL_~!!~IJ!'!~H_~!_J -36 B LUE7S G RA Y + S V OLT S R EF ER EN CE

73 PINK/BLACKBLACK

72 PINK!

1 " - - - - - - - - - - - - - - - - - - - - ,TO IICOO lA N T T EM P fI tA T lJ RE S EN S OR I~ - - - - - - - - - - - - - - - - - - - - ~- SENSORGI I .OUND

9-15-92NS 1 43 41

C HAR T C ..1HTHROTTLE .POSITION SENSOROUTPUT CHECK1.7LTHROTILE BODY INJECTION NIVA

Circu i t Description:The throttle position se nsor is a tta che d to th e th ro tt le b o dy . and is inte rn ally ro ta te d b y th e th rottle body sh aft. I t isa potentiom ete r w ith one end connected to 5 volts from the e lec tronic contro l m odule and the othe r to e lec tronic con-trol m odule g round. A third wire is connec ted to th e electronic control mo du le . a llo win g it to m ea su re th e va ria bleou tpu t vo lta ge fro m the thro ttle position sensor.

A s the thro ttle v alve a ng le is changed (accelerator pedaJ. mov ed ); th eth to ttle p ositio n s en so r o utp ut vol tage alsochanges i n proporuon. Ata c lo se d t hr ottl e posidon, th e oU tp ut,y ql ta g e i St+ SU : ~Yb el ow 1 .0 v ol t. A s th e'th I'Q r tl e v al veopens. the output incre ase s so tha t. at wideopen throttle; tbeoutpctsbould be a .b O ve jtO voltS . B y m onitoring the out-put volta ge from the throttle posirtcnsensor, th e e le ctr on ic c on tr ol m od ule can de te rm ine fue l n ee ds b ase d o nth rortleo pe nin g (d riv er d em a nd ).A b roke n or loose throttle position se nsor, or one tha t has a n u nsta ble o utp ut, c an c ause inte rm itte nt bursts of fuelb ec au se th e e le ctr on ic c on tr ol modu le thinks th e throttle is m oving . R esults cou ld inc lude eng ine surg e or poor idlequality. If the e lec tronic control m odule inte rpre ts a high voltag e w hen eng ine revolutions pe r m inute is less than 420 ,h ar d sta rtin g c ou ld be th e r esu lt ("cIeart100d mode). A prob lem in any of th e th ro ttl e p ositio n se nso r c ir cu its will se t

either a Code 21 or 22 after the eng ine is Staned. Once a code is se t. the e lec tronic c ontrol m odule w ill use a n artifi-c ia l de fau lt va lue for throttle position sensor based on eng ine revolutions pe r m inute to enab le the vehic le to be dri-v en . a lth ou g h performance.could be less than norm al. 'T he thro ttle p osition se nsor is n ot a djusta ble . T he e le ctron ic c ontro lm od ule u se s th e reading at id le a s "0 % throt-tle." so . no a dju stm e nt is n ec essa ry .

Test Description: N um ber(s) b elow refe r to ci rc lednu mb er(s) on th e d ia gn ostic c ha n.I . This is a check of the voltage a t the id le position. Itis usually less tha n 1 .0 volt.2 . The voltage should inc rea se at the same steady ra tea t which the throttle is opened w ith the throttleva lve .3 . W ith the throttle va lve w ide open. the throttle posi-tion sensor output needs to be above 4 volts. a llow -ing the e le c tronic contro l m odule to interp re t a w ide

o pe n th ro ttl e p os itio n.

~".. ~.

. . . .

4. If th e c losed-throttle voltag e is ove r 2 .5 volts. hardstarting may be encounte red (worse cold) due to"c le a r-flood" m ode. This m ode occurs w hen eng inerevolutions pe r m inute is less than 420 . and throttleposition sensor input indica tes the throttle is m orethan 8 0% open. P ossib le causes: short to vo lta ge onthrottle position sensor input sig na l c ircu it (B luew ire from throttle position sensor te rm ina l "C'ttoe lec tronic control m odule te rm ina l "C 13 "). openg round circu it (P ink/B lack w ire from throttle POS I -tio n se nso r te rm ina l "S" to e lec tronic c ontro l m od-u le te rm ina l "A 1 1"), or a fau lty se nsor.

il2V/lZ. SERVICEMANUAL THRonLE ElODY INJECTION NIVA


24/48

ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJEalON 2123

CHART C-1H,rH~()TTLE ,POS IT ION SENSOR-OUTPUT CHECK"'1.7L THROTTLE BODY INJEctiON NIVA

IF A CODE 21 OR 22 IS PRESENtFOLLOW THAT CHART FIRST.o ONNECT nCH 1 "S(AH- TOOf. . . SELICT -F": DATA UST.- THRonu nOSED. IGHmoN "ON. ENGINE NOTJU N taNG .. ,WHAT ISTHETHItOnuP9S1J1OHvdt.t~G(,~~'~THEltOt 17I i" ' '_--, "':(;' ..I 'I0.25- 1.25 I OvtlllUS I

1 7 \ 2 _I\..V WITHTHEnCH 1 SCAN" TOOLSTU CONNECT tD ,MONITOA THE THIlonu f'OsmoN VOLTAGE AS THETHltonu IS5lOWl. Y AHO STtADIl YOI'fNfD TO AWlDE.of'N POsmoH. VOlTAGE SHOULD INOIfASI: AT,A STlAOY M.Wn:I1NO $UQOEN ~ES. '

IfYOlT ....GE DOtS NOTIliiMEDCAmY fOlLOWTH~onu 'MOy(MEHT,~ IS 'A U tN . ' ,

1':'\ DlSCONNfCT ntAonu rosmON S(NSO,.\,:) ANDItfCHtCJ(nCH 1~onu POSITIOH

VOl TAtil AS usrso IN STEP 1. UNDO 1VOlT J IOyu l.VOlT J ',~.::::::~~__"~ < : K i < ? a - I l f ' E ~ ! t t A _ O T 1 U , "P OS i'IlO It S lN So G aO UN O "~:~~:S0ll'nRMINAL"10 tumONicCQHTRCM. MOOUU TElMJrCAt."AU.,. .,QK.,C(PUoaTHlonu f 'OSmON SfHSOlt.

,

I

" AEPAJIIl,SHOTTOV O l T A G E ON iJ.tAonu' . p o $m O f SENSoii. "... ptl1.-SIGNAltatOO(llUf WIRE fROMMOnu 'osmoNSl~ TERMINAL .c-TOEumoMCCONTJOl MODUUTERMINAL "cn-, .

-A F TE R R E PA IR S .- S TA AT EN GIN E, C LEA R C OD ES A ND C ON FIR M N O -C HEC K EN GIN E- U GH T.9-1792

NS 14381

MOY(' VOlTS}. ,a fL OW V OlTS JIEPLAaTHlOmEIfOSlT1ONSENSOL". ". :.,VAZ SERVICE MANUAl THROTTLE BODY INJECTION NIVA


25/48

2-124 ENGINE MANAGEMENT SYSTEMS 1.7L THROTILE BODY INJEOION

AIR flOW ELECTRONICCONTROL MODULE

47 BLUEflNHrTE48 BLUE/BLACK

49 GREENflNHrTE50 GREEN/BLACK

COIL -A- HICOIL -A- LOCOIL -B- HICOll-e- La

91592NS 14394

--

CHART C..2eIDLE A IR CONTROL CIRCUIT CHECK ....

1.7L THRO lTLE BODY IN JEC TION N IV ACircuit Description:The e le c tronic con trol module controls idle revolutions pe r m inute w ith the idle a ir control va lve . To increa se idle -revolutions pe r m inute , the e lec tronic control m odule m oves the id le a ir control va lve out a llow ing m ore a ir to passa round the th ro ttle pla te . T o dec rease revolutions pe r m inute , it m oves th e idle a ir c ontrol va lve in, redu cing a ir flowa round m e throttle pla te . A Tech '1 "Scan" to ol w ill re ad th e e le ctron ic c ontrol m odu le c omm ands to the idle a ir con-trot va lve in counts. ''''';Test Description: Nurnbens) b elow re fe r to c irc lednumbens) on the dia gn ostic c ha rt.I . The Tech I revolutions per m inute control mode isused to exte nd a i 1 d re tra ct the idle a ir contro l va lve .The va lve should m ove sm oothly w ithin th e speci-fie d r an ge . If the id le spe ed is commanded (idle a ircontrol ex tended) too low (be low 750 revolutionsp er m in ute ), the e ng ine m ay Stall: This m ay be nor-m a l a nd wo ul d ,n ot in dtc a ,te ," a,p ro b lem .R e ,tr ac tin gth e idle .aircontrol b eyondfiscoIlIfoH ed range(above 1 8 00 r ev ol utio ns p er m inute ) w ill c ause ade lay before the revolu tions pe r m inu te stan drop-ping. ntis too is normal,2 . This test uses the Tech 1 to command the idle a irc on tro l c ontro lle d idle sp ee d. The e le c tr on ic c on tr olm odule issue s com mands to ob ta in com manded id lespe ed. The node lig hts each should fla sh red andg reen to ind ica te a g oo d c irc uit as the electroniccon tro l module issues commands. W hile thesequence of colo r is not im portan t if e ithe r lig ht is

"OW' or does not fla sh red and g reen , check thec ir cu its fo r fa ults, b eg in nin g with p oor te rm ina l c on-ta c ts. Eng ine spe ed w ill not ac tua lly chang e , sinc eth e id le a ir c on tro l is d isc on ne cte d,Diagnostic Aids:A slow , unstab le , o r fast idle m ay be caused by anon-id le a ir c ontrol system prob lem tha t c annot be over -come by the id le a ir control va lve . O ut of con tro l rang eidle a ir control Tech I too l "idle a ir control" counts w illb e above 60 i f idle is too low and ze ro counts if id le istOO hig h. T he follow ing c hec ks shou ld be made to repaira non-idle a ir c ontrol syste m prob lem :

V acuum Leak (High 'Idle), If id le is too high. stopth e eng ine . F ully extend (sea t) idle a ir control using222 OM idle aircontrol "M otor Te ste r" in the A"Low S witch P osition." S tan eng ine . If idle speed isabove I O C X J revolutions pe r m inute . loc a te and cor-re c t va cuum leak inc luding C rankcase V entila tionSystem . A lso check for b inding of throttle b lade orlinkage.

F ue l S ystem too le an (H ig h A ir/F ue l R a tio ). Th eidle spe ed m ay be too high or too low . Eng ine speedm ay vary up and down, and disconnec ting the idlea ir control va lve does not he lp . C heck forlow reg u-la ted fue l pressure , wate r in the fue l or a : restr ictedinjector . F ue l S ystem too r ich (L ow A ir/F ue l R a tio). Theid le sp ee d will be too l ow . " S ca n" tool id le a ir con-tr ol c ou nts will usua lly b e above 80 . S yste m w ou ldbe obviously rich and may exhib it b la ck sm oke inexhaust. C heck for h igh fue l pressure , le aking or

stickinginjector, Throttle B ody, R emove idle a ir c on tr ol v alv e and in -spec t bore and idle a ir p assa ge s for fo re ig n m ate ria l. Idle Air Control V alve Electrical Connections,Idle a ir c ontrol va lveconne ctions should be careful-ly che cke d for prope r conta ct. C rankcase V entila tion System , A faulty systemm ay re su lt in an incorrec t id le speed. R e fe r to "R ough , U nstab le , Incorrec t Idle orS ta ll i-n g," in " Sym ptom s." S ec tio n ' 2_ 9 B" . If in te rm ittent poor driveab ility or idle sym ptom sa re re so lved b y disconnec ting the idle a ir control.

c a re fully recheck id le a ir control connec tions andt erm in a l r e si st an c e.VAl SERVICE MANUAL THROTILE aoov INJECTION NIVA

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26/48

EN GIN E M AN AG EM EN T SY STEM S 1.7L TH RO TTLE B OD Y IN JECTIO N 2125

CHART C-2CIDLE AIR CONTROL C IRCU IT CHECK1.7L THROTTLE BODY INJEOION NIVA

8fN G IN E A l N O RM A L O PER A TIN G TEM PER A TU RE ( IS-C9S"C) . EN GIN E tO LIN G IN N EU TR AL W ITH P AR KIN G aitu: SET. ' AIR CONDIT IONING "Off.- CO HNECTTECH 1 ~SCA .N - TO OL SELEC T-M IS e . TESTS ,- TH EN -ID LE SY STEM , TH EN -IOU CONTROl . - W ITH TH E T HR OTTL E R EM A IH IN G C LO SED . C OM MA ND TH E D ES IR ED100E SPH O TH RO UG H R AH GE F RO M 700 " ;E VOLUT IONS P ER M INUTE

U P TO 1 S O O REVOLUTI ON S P ER " "I NUTE . E N GIN E S PE EO SH OU LD F OU QW TH E C OM MA NO E e IO U SPEED .OOESm

C D D IS C ONNEC T HARNE SS cOfr II iuao. fR OM TH I: I OL f A I.., , ' C ON TRO L V ALV E A N D IN $TA I,J..H AR ilriU S C .:)N HEC TO RIN TO -N O DE U G HT'" fR OM Tf:S TER IO T 122 oM. :

EN ~~EliJNN ING . U S INGTECH~1,CO """,,-,ND THE ,D ES IR ED IO LE S ~nD TH li:O U GH A ItA N GE U P AMOCOWN. EACH NOO L IGHT SHOULD fLASH REO AND G affN IUTNEVER OF f." --

D01HEY?

"IG NITIO N O FF .- D IS CO N Nf:C T TH E H A RN ES S C O NN EC TO R" F R OM THE IO U 'A IR C ONT RO L V AL V E. U SIN G TH E D IG ITA L V O LT O HM A MP

M ULnM ETER 1(Il) nut,cH EC K R ES isTA NC EAC R OS S 1 00 E A IR C ONTR O L V A LV E C O I LS . SHOULD If &0 TO 10 O HM S 'ETWE E N I OUA IR C O NTR OL V A LV f TER M IN A LS -A - TO -,-AND C TO -0.

,,

....

I~~Y ~ES ~ ~ .~~O ~~~ .~~--..~~~ CON HfCTTOO l -. .' . : .',C HECdtESISTA NC f 'ETWffN

13.7~ 1 2 2 oM " 'MOTOR I Q ( E ' ~ CON~() l :VAlYE: ' :, , " ! 1 ~ M ~ ~ ~ ~ ~ : : i j J i S ~ l O . ,; !~ :~ ,~ t :~ -ANO-C~ANOCONNECToiTOTH fIOU .... S HO ULD 'ElN flN lTE. N OCON lltO t. V ALVE. CONTINU ITY OPEN C IRCU IT.

wtTH EN(W(_DUNG.CYCU:2UOM SW IT C H " HI G H A ND "L OW.-ENGINESH ED SH OU LD INCREASEAND M OEA SE AS TOOL SWITCHI SMOV(O.DOES t n REP \ .ACfIOUA iR CONTRO l

VALVE "NORETEST.

fA ULTY IO I.EA IRCO",TJ,9l V,ALVe _> n , ' . : ' , ::",~~ r:~~LO - ." _ ; , C O N T A . C T S . . OPEN IO lE A IRCONTROL C I RCU IT S,

INaUDINGCONNECTORS . JO lE A IR CON TftO LC IRCU ITS SHORT IOT O GRO UN O O R

VOLTAGE . fAULTY ELEC11tONICCON .T ROL MODUL I:

C ON N EC TIO N S 0 REPlAc tEumONIC'CONTRot MOOUU .REPAl f tASN EC ES SA R Y ANDRETEST .

N OT O K

3-9-91NS 1439S

.REP lACE IO U' .AtRCONTROLVALVEANDREnST.

IN OT O KJ

IO U A U! (O NllI.O l V AL l. 1." .0 C IR CU IT S ARE O I LREFER lO -o lAGNOSTICA ID S O NF AQN G P AG E.

I

_ O t EeX,104..l"'.' USAGfS ' INTHaOmEIO OV U NIT. IfOK .REPUCE IO U A litCQNTKO l V. . . .VE.

: R E . . . . : A a EUCTR ()NK ,CONTROLMOO uU '

AFTER ALL IDLE AIR CONTROL TESTING IS CO MP tETE, RESET THE rOLE AIR CO NTR OL V ALV E. C ON NEC TTECH 1 "SCAN" TOOL. SELECT "M iSe TEST," THEN "IDLf SYSTEM ," THEN "IDLE RESET."

-AFTER REPAIRS, STAAT ENGINE, C I .EAR CODES AND CONFIRM NO -CHECK ENGINH UGHT.

VAZ SERVICE MANUAL T HR OT TL E B OD Y IN JE CT IO N NIVA175


27/48

2~126 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJEOION

~ ' I A PPULSE WIDTHMODULATEDC AN lffiR C O NN EC TO Rfront fiKe view A ELECTRONICCONTROL MODULEFUSE R (BLACK)~

9-1s nNS 14396

PULse 'MOTHMODULATEDCAN I STER CONT ltO lT_"'''-~--- 41 GREENNElLOW ----4r - - - - - - - - - - - . ,1 TO I1 OXYGEN Sl:NSO~ t . . .. . .. . .L .l 27 PtNKJBLA.CK

r - - - - - - - - - - - - - - . ,TO ,I I NTM~ MAJUFOLD HATER . .. .. . .. 82 P INK ': RHAY : BLACKJ

1 " ' , 29 PtNKIBLACKI TO I ....1 VEHIQ.E SPHD 1L s!~~! J

26P INK /B lACK

CHART ( ..3CAN IS TER PURGEVALVE CHECK1 .7L THRO lTLE BbOY IN JECT ION N IVA

Circuit Description:Canister purge is controlled by a solenoid that allows manifold vacuum to purge the canister when energized. Theelectronic control module supplies a ground to e ne rg ize m e solenoid (purge "ON"). The purge solenoid controlled by

the electronic control module is pulse width modulated (turned "ON' an d "OFF' several times a second). The dutycycle (pulse width) is calculated based on the current value of the "Closed Loop" fuel adjustment .The duty cycle is calculated by the electronic control module and the output commanded when the following condi-tions have been met

Battery voltage is less than 16.9 volts. Coolant temperature above 800C . Vehicle speed above 21kilornetefS per hour. Throttle position ha s exceeded 2%.Also. if the diagnostic "test" terminal is grounded, with th e engine stopped. the purge solenoid is energized(purge "ON").NOnCE: Once enabled it will remain enabled except during a wide open throttle condition.

Test Description: Numberfs) below refer to circlednurnberts) on the diagnostic chart.1 _ Checks to see if the solenoid is opened or closed.

The solenoid is normally de-energized in this step;so it should be closed.2. Checks for a complete circuit. Nonnally, there is

ignition voltage on Circuit 25 and the electroniccontrol module provides a ground on Circuit 41.

3. Completes functional check by grounding "test" ter-minal. This should nonnally de-energize the sole-noid opening the valve which should allow the vac-uum to drop (purge "ON").

. Diagnostic Aids: If 10" Hg (34 kPa) of vacuum is not available at the

solenoid check for:- Split or cracked hoses.- Pinched or plugged hoses.- Ensure hoses are installed correctly. When using th e Tech 1 "Scan" tool to energize thesolenoid, remember mat this is an "OFF' and "ON"control only. The Tech 1 "Scan" tool is not capableof adjusting the pulse width.

VAl SERVICEMANUAL THROTILE gOOY INJECTION NIVA

-

" : f

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28/48

,. . .

ENGINE MANAGEMENT SYSTEMS 1.7l THROTTLE BODY INJECTION 2127

CHARTC-3CANISTER PURGE VALVE CHECK

1.7l THROTIlE BODY INJECTION NIVA

0).1.ij IG N IT IO N -0 ""- E NG IN E S TO PP ED .A T TH ES OL N O IO US E H AN D O PER AT ED V A :iJU M P UM P J ]5555. APPLYVAC l ! , UMXW" Hg 0 ,, _: l4 kPa )TO " 'A~ ' fO lDV ACU j jM Sf O f OF SOLENO ID .1

A aL E T O GET 10- Hg OR I34 kPa Of VA C UUM . UNABLETO GET10- Hg OR J14 kPa O F V A CU UM .I _loD I SCONNECT SOLENO ID . C O NN EC T T ES T L IG H T B ETWE EN H A RN ES S nIM IN A LS . nSTuGHT SHOULD NOT L IGHT.

OOESm

o ENG INE IDUNG . EN ER GIZE SO LEN OID .'" U SIN G TH E n CH 1 -SCAN-TO OL - E VA P SO LEN OIO M OD E. IN O RO E I TO GET TOTH IS AREA Of TH E TO O L. Y OU M U ST F IR ST S CA NTH ftO UG H -M ISC nSTS- A ND -O UTPU T TESTS . V ACUUM SHOULO DROP .D OES In

I,".;:...... -. $ ..r-N O.... ---,'$~Y:~ ~$~N~~---------------~ ....- ro~i -E-EA-(-H-T-E-RM--~-A_L~W ITH A nSTUGHT TOGROUND . D ISCONNECT SOU NOW I.ELCTittcALCONNfCTOR. I D OE S VACUUM , HOW lIG H T O N ONE I'_"r'OR_.,..,.,O~P~7~~~~_~~,1 .,.-L... .;.......,

FAULTY SOLENOlOCONNECT ION 0 1 1 :SOLENOID.

WITH ENGINE lOl.ING. VERIFYTH A T A M IN IM UM O F 10 Hg(34k P.al OF VACUUM ISAVAluau: AT CAN1STR PURGESOLENOID.IS IT? '

I NOUGHT IS Hoa tE D O I':C U IT .1 R [P AIR S H O R Toa-fAVlTY TO VOLTAG fI H_. . _ ~ -~ ~ g ( ~ (J O U L t_. . . . . . _ ' . .. . CU----" 'T. . , .4_.I.. _ _ _ ';:".

$ ~----.--__.-~rA__.-----., $ORCUIT41O PEN O RfAULTYELEcraoli lC,(ONTROL"MODU lE .

CH(CK HOSES. IF. OX ,REP lACEp UR G E S O LENOW.NOPR08LEMfOUND.

SEE -D IAGNOSTIC1 .1 05- O N fA C IN GPAGE .

VAl. SERVICE MANUAL THROTTLE BODY INJECTION NIVA

1

OPENOReUl"25126.

"2S2NS 14397

177


29/48

2-128 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION - -ELECTRONIC .iF r

CO NTROL M ODULE \~-i-GN ITI ON SWI TCHV OL TA GE IN PU T S IG NA L-'

ElEC TRON IC S PARKTIM IN G O UTPU T iBY PA SS M OD E C ON TR OL .;,jREF ERENCE I NP UT S IGNAL

'.FtEFERENCE LOW ~ J i. . . J

russ '8\(" (GREEN)~ 14P1NKlBLACK

PlNKIBLACII :161S PlNK/BtACK

VP CONNECTOR 1 " ' - - - - ,1 3 WH IT E ~ L r _ A : ~ . ? J86 PINK/BLACK ...J

39 GREENfoNHITE4 0 BLACKM 'H ITE42 V10lETfoNHiTES8 BLACKJREO

6IWHrn:678ROWN

CRANKSHAfTSENSOR -D I RECT I GNmONS Y ST EM MOOUL E

lO-U-9ZN.S14400

CHART (-4(Page 1 of 2)IG NITION SYS TEM CHECK(NO SP ARK )1.7L THROTTLE BODY IN JEC TION N IV A

. . . .Circuit Description:

The direct ignition system uses a waste spark method of distribution. In this type of system, the ignition moduletriggers the correctigmuoncoil. based on s igM l s frO rn the crankshaft sensor, Each ignition coil provides the high sec-ondary voltage required to fire twospark plugs a t the same time on "companion" cylinders, i.e., cylinders with pis-tons at the top of their stroke top dead center at the same time. One of these pistons would be at the top of its com-pression stroke, the other piston would be at the top of its exhaust stroke,Test Description: Number(s) below refer to circlednumber(s) on the diagnostic chart.1. Becasue the direct ignition system uses two plugsand wires to complete the circuit of each coil, the

opposite spark plug cable should be connected toground.

2. This test will determine if + battery voltage is avail-able at the ignition module.

3 . This test will determine if a good ground is ; avail-able at the ignition module.4. Checks for continuity of the crankshaft position sen-

sor and connections.5. Voltage will vary in this rest depending on cranking

speed of engine.

-

VAl. SERVICEMANUAL rHROTILE BODY INJECTION NIVA'78


30/48

ENG INE MANAGEMENT SYSTEM S 1.7 l THROTTLE BODY IN JECTION 2129

NOTE: TH IS C HA RT A SS UM ES TH AT TH ET EC H NIO A N H A S P ER FO R ME D O IA G NO ST lCG RC U Il" C H EC K C HA R T A .

CHART ( ..4(Page 1 of 2)IGNITION SYSTEM CHECK(NO SPAR K)1.7lTHROTTlE BODY INJECT ION NIVA

' (2) U S IN G S EC O N DA R Y IG N IT IO N V O L TA G E I GN IT IO N T ES TE II .J 26"2 S T-1 2S C H ~C K fO R S PA R K, CH ECK ONE CABLE ... .T A TIM E, US IN G C O N NE CTO R T ERM IN A L T ES T A D A PT fR K IT J lS61' TO JU M'~ R TH E I GN m ON cal LCOMPAN ION CAlLE C O NN EC TE O T O G RO U ND WHILE CRANK ING . CH EC K fO R S P .. ..RK O N o..U 5 1,2.1....D ...IS T H ER~ SPA RK ON A T U A ST ON E CABU?~ ""

(.0 '. IGN IT ION -OFF." , 'V .O I SCONNECT DIRECT IGN fT lONSYSTM MODULEl . ... .,A N D , ,. .. , CONNECTOR . I.G~ITION ON~" ,_ : -: .'.." CONNECT TEST UGHT J 141.2~ I ETW f:EN G I I. O UNO AND,DMECr IGNITION SYSTtM

MODULE 2 'IN C QN N EC TO II . H A R N ES S T tAM IN A t. 1- A N o C ;O N fo IE CT TE STl.I GH T T O ' P INC O NN EC TO R H A #tN ES S T ER M IN A l "I",IS T ES T L IG HT "O N" fO R e....CH C I Rc umIS _ " " " , ' , " " "

O ISC ON N EC T )W A Y C ON NEC TO R F RO M D lU CT IG Nm OH SY STEMMODULE . WITHOHM METE It P fl :O I E HARNESS Ttll.MINAlS A ND C " Of JWAY

H AR NE 5S C ON NE C TO A. S HO UlD A EA D IETW EEN 5 O Q . . 700 O HM S.

~ ~ : ~ : 0 ~ ~ - - '1 SE e cHARTC~1:PAGn'on: :_:__ ';' 4

f....LTY C ON NECTIO N ~ ..OPEN CIRCUIT 15116P fNK /8 LACK W I RE .

FAULTY CONNECT IONO R O PEN O RC UIT 21I ROWNWIRE .

...$J . .. .. .. ~~~~ ;~~~g~~Tv~~:'~ .~~~""WM m ...A a s

C RA NK iN GIM EA N!> :oisiF lV t:vO LTA Gf EA DtH G. IlEA DIN GiSHOULD If GRfA TEI tTKAH0;) VOLTcJO omvl, ... . .. . , . . .. . .. ,. ... - - .IS In SEN SO i:! ."" "" "" ""' "" ~ llEAD SI SH~TED8 S TOGHH (RORVB NO FAULTYCRANKSHAFT

fAU LTY CONNECTION fAU LTY CONNECTION P 05mONOR all. SEN SOR .FA u LTV D IRECT IG NITION F ....U LTY O lA NK SH AfT5 ' fSTE M . M ODULE. PO S rnON SEN S tm .

~

. . . N OT O K_ II

Lf ' SSTHANSOO .OHMS J GREATU T H A I ; " ,, 700 OHt- tS

O PEN SEN SO R 'C IRCUIT ' 78 ROWNWlREO R C lR C U rT "WHIT~WIREOR fAU l. TYCONNECTIONOR F A ,U LTYCAANK SHA f TPOSmONSEN SOR .

~ AFTERREPA JRS . ~ S TA R T E NG IN E. C l.E AR C O DE S A N D C O NF IR M N O w CH EC K E N GIN E" U G HT .2~9)N S 14919

V A 2 S ER V IC E M A N U A L T HR O nL E BODy I N JE C TI ON N I VA17 9


31/48

2-130 ENGINE MANAGEMENT SYSTEMS 1.7l THROTTLE BODY INJECTIONRJSE "Y" (GREEN)~ 14 P INK /BtACK

PlNKIBLACK

A 21 BROWN - - - - t I l1S P INK/BLACK

IIP CONNECTOR r----.,~,TOJ13 WHITE C!J - ~T_A._~~J86 PINK/BLACK

39 GREENNJHITt40 BLACIUWH ITE42 V10LETMIHITES8 BLACKIRED

68 WHITE678ROWN

CRANKSHAFTSENSORDIRECTIGNmONS YS TE M MODULE

CHARTC~4(Page2of 2)IG NITIO NS S TEMCH EC K(NO S PAR K)1.7L THROnLE BODY IN JECT ION N IVA

1 6

ElEaRONICCONTROL MODULE

IG Nm ON SW ITCHVOLTAGE INPUT SIGNAL

ELECTRONIC SPARKTIMING OUTPUTB YP AS S MOD E CON TROLREFERENCE INpUT SIGNALREFERENCE LOW

10-22:.92NS 1 44 00

-~;

- ~ . ;

. ,

Circuit Description:The direct ignition system uses a waste spark method of distnbcuon, In this type of system, the ignition module[riggers the correct ignition coil. based on signals from the crankshaft sensor. Each-ignition coil providesthehigh sec-ondary voltage required to fire two spark plugs at the same time on "companion" cylinders. i.e., cylinders with pis-tons at the top of their stroke to p dead center at the same time. One of these pistons would be at the top of its com-pression stroke. the other piston would be at the top of its exhaust stroke. .

Test Description: Nurnberts) below refer to circlednumberts) on the diagnostic chart.6. If carbon tracking is evident. replace coil and besure plug wires relating to that coil are dean andtight. Excessive wire resistance or faulty connec-tions could have caused the coil to be damaged.7. This test will determine if the ignition module is nottriggering the problem coil or if the tested coil is atfault. This test could also be performed by usinganother known good coil.

VI>Z.SERVICE MANUAL THROTTL E BODY IN JECT ION N IV A


32/48

1 , .-o -: , . .

t':f / ; :

ENGINE MANAGEMENT SYSTEMS 1.7L THROTILE BODY INJECTION 2-131

r - . . . L . - - - - - - - - - ,: FROM CHART C~ :I ~A.GE , OF 2. . . ~ _ .. . . . .

CHART (-4(Page 2 of 2)IGN IT ION SYSTEM CHECK(NO SP ARK )1.7 l THRO ITLE BO DY INJEC TIO N NIV A

USING O IG IT A L VOL T 0 HM AM P M U l TIM ETE II K IT J .39689 TO CH E(I( TH EII E S IS TA N C E O f A CH P l UG CABLE OF THE CO IL WH ICH 010 NOT flIIE TH ES PA II I( T ESTEI I_

CABU RESISTANCE SHOULD S[ L ES S TH AN 1S .OOO OHM S EACH AND WlIIHSHt iUL6NOTStGROUNOED.A R E C A BL ES OK'

MU.!>UAe SECONDARY RESISTANCEO F I GN rtJ O N COIL 8'1 ' CONNECTINGE AC I1 M U L T IM !T E"R LEAD ON EACHC O IL T OW E$ ! T fR M IN A l.IS RESISTANCEBETWEEN 5000 AND7GQOOHMS '

.,;'R fM o\ie C OIL RETA IN IH GH UTS A ND REMO v E -.. Call> .. . . ... , . tO IL SHOULD B E fR EE Of CARBON TRA :d c't NG .

A RE TH En

REPLACE IGNITION COJL.ALS 0 ICH,ECKFPR fAUlTYSP~RK,PLUG, tAILE CON""ECTlON(SI ANDW i R E Nip9i:_,E(S)FO itcAR JOH . .TRACK iNG :': ,.

M EASURE PR IMARY R ES IS TAN C E O fI GH IT IO N .COILIYtONHECTlNGfAC~MoqIMt: r~R lAD ,ON fA C " .F E~ A LE l UM INAL ONIOnOM OF ...IGNrriQN'olL.'. ", ,: ...,IS RES:iS 'TANtEIETWt~NIJ. lQ.4NO'UP?

> : ' o " : _ r: .,.......

F A U L TY CONNEC T IO NOR IrA UL TY IG NITIO N C all.

(2) USE TEST L IGHT 134142-1 AND CONNECTOR rERM INA lTEST AOAP rER KIT J 35616 TO J UM P ER T ES T LIGHT ACROSSIG NITIO N M O DU LE TERMINALS WHICH CONNECT TOIG NITIO N C OIL P IU MA AY TER MIN AL S.

CRANK TH E EN GIN E W HIL E O IS ER VIN G TES T L IG HT .' OOfS T~STl!GI:tT BLINK?

FAULTY IGNITION C OIL TER MIN AL C ON NEC TIO NSOR. FAULTY IGNITION COIl.

A F T ER REPA IR S .H S TA R T E NG IN E. CLEAR (ODES AND CONF IRM NO CHECl< E NG IN E" L IG H T.

VAl. SERVICEMANUAL THRonLE BODY INJECTION NiV . \

':279JN S 15201


33/48

2-132 ENG INE MANAGEMENT SYSTEM S 1.7 l THROTTLE BODY INJEalON

FUSE "Y" (GREEN)~ 14 P INK /B lACK ELECTRONICCONTROL MODULE

P lNK IBLACK

21 BROWN - - - - I I I15 PINK/BLACKJJP (O t.&NECTOR ,.. ..,

TE~LTOI13 WHI . C!J - L T _ A . , ? : I ~ l86 PINK/BLACK ---- __ -'

16 IGNITION SWITCHVOLTAGE INPUT S IGNAL

39 GREENfWHITE40 BLACKIWHITE42 VLdlETIWHITESB BLACK/REO

ELECTilONIC SPARKnMING OUTPUTBy pASSMODE CONTROLF l E F E R E N C I : IN PU T S LG NA lREFERENCE lOW

6 8 W H IT E67 BROWN

CRANKSHAFTSENSOROilASSEMBUES L-__ .......DIRECT IGNmONS YS TEM MODUL E

10-U92NS 14400

CHART (-48(Page 1 of 2)D IRECT IGNIT ION SYSTEM M IS FIR E A T ID LE1.7L THROTIlE BODY INJECTION NIVACircuit Description:

T he direc t ig riitiQ n system uses a w aste spa rk m ethod of distr ib ution, Inthis t y p e of system , the ig nition m oduletrig g ers th e {t1/4 coilpair r es1 .1 l .t ing in bo th #1 and #4 s p ar k . p lu g s firing a t the sam e tim e ..#L cylinder is on the corn-pression stroke a t the sam e tim e M ison the e xh au st s tr ok .e , resultingina lower 'energy r equi rement to fire #4 sparkp lu g. T his le ave s the re ma inde r of th e h ig h voltage'tobe used to fir e I tH p ad cp 1u g: O O ,th is a pp lic atio n. th e c ra nk sh aftp osition se nsor is m ou nte d to th e e ng in e b lo ck a rid p ro eu de sto within approximately 1 mm of the c ra nk sha ft reluctor,S ince the re luc tor is a m achined portion of the c rankshaft pulley and the c ra nk se nsor is m ounted in a fixe d positionon the block. t iming adjustments a re not p ossib le or ne ce ssa ry.Test Description: N um ber(s) b e low re fe r to c irc lednum ber(s) on the diag nostic cha n.I. If the "M isfire" com pla int exists under load only.diagnostic CHART C-4C must be used. Eng ine rp mshould drop approxim ate ly equ ally on all p lu g le a ds .2 . A se condary ignition volta g e ignition te ste r J 26792(ST-125) must be used b ec ause it is essen tia l to veri-

fy a dequa te ava ila ble sec ondary voltag e a t the sparkplug (25.000 volts).

3 . If the spark jumps the test g ap afte r g rounding theopposite plug w ire , it indic ate s e xc essive re sista nc ein the plug which was bypassed. A faulty or poorconnec tion a t tha t plug could a lso re sult in the m isscondition. A lso che ck for ca rb on deposits inside thes pa rk p lu g boot.

VA l SERV ICE MANUAL THROTIlE BODY INJECTION NIVA18 2

-.{-

-

-. . .


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ENG INE MANAGEMENT SYSTEM S 1,7l THROTILE BODY INJECTION 2133

..

8F EN G IN E M IS f IRE SU ND E R lO AD O Nl Y .SECH ARTC~C~ IGN iTiON O F F , D ISCONNECT fACM SPA IitK PLU G CA lL E F RO M SPA RK PL UG . IN STALL H IGH CAR&ON ,cON TENT VA'CUUM-HOSE ApPIitOXIMA TE L Y 5 CM

Lo'NGONSPARKP1.UGANO CONNECT S P A R KPLUGlU.O TO :OTHER EN OOf V ACUU ""-H 0 5 (VACU UM i-tOSE ,.nets FOUNO IN nRMtHAL TEST'ADi.;nRKITJ3S6,6j .' . '.'_ . .' .

C ONNECT tECH 1. SELECT F e: DATA UST.- ENG IN E IDL ING AT NORM AL OPERA nN G TEMPERATURE . DISCONNECT

IDLE AIR CONTl tO l VALVE. WITH TE5T LIGHT J ~ 142-11 CONNECTED TO GROUND MOMENT Ull YTOUCH EACHVACUUM HOSE, WHilE O_SERVING ~ENG INE SPUD ON

TECH 1. SE E CAU1l0N . WHEN TH E TEST L IG HT CONTACTS EACH VA C UUM HOSE IT SHOULDRESULT IN A N EN GIN E SPUD DROP.D ID T HE Y"

CHARTC-4B(Page 1 of 2)DIRECT IGNITION SYSTEMMISFIRE AT IDLE1.7L THROTIlE BODYIN JECT ION N IVA

W ITH IGN ITION "OF F . "INST A ll SEC ON DA RY IG NITIO N VOLTAGE IGNITIONTESTER J 26792 (ST-12S ) ON PLUG C A IlL E {S )W HO S E S H O R 11 0 GROUNOTHROUGH TEST LIGHT 01 0 NOT RESULT IN ENG INE SPEED oa,op_

SPARK SHOULD J UMP SECONOARY IGNITION VO l TAGE I GNmON TESTER GAPWH ILE C RA NK IN G EN GlN E.OOESlT"l

SEE ROUGH .UN STA 8LE ORINCORRECT IDLE D R S TA LL 1N G91NS :Y MPTO MS SEC TIO N S_

DOES IT?

=..:CONTlNUE TO :,PAGE 2 O F 2 IL_-" __ J

jE~CE TH E SPARK "-,UG .f OR rH ~ CAS l E WHICHWAS i U M P E RE010-~IitOUND: if 'M IS fiR E IS S T 1L lPRESEN T; STA RTM lS ftRE TEst A GA IN A TH EP #,.

* CAUTION : When handling secondary spark plug cables with engine running,insulated pliers must be used and care exercised to prevent a possible electrical shock."AFTER REPAIRS:' START ENGiNE. CLEAR CODES AND CONF IRM NO "C HEC K EN GIN E- UGHT .

4-2793N S 1 58 (1 4

V A 2. S ER V IC E MANUAL THROTILE BODY IN JEC TIO N N IV A


35/48

2134 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJEalONruSE "Y' (GREEN)---fI'\.1-- 14 PINK/BLACK

21 BROWN . . . . , / 1ELECTRONICCONTROL MODULE

-

-A1S P IN K /B lACK

COILASSEMBUE5 ...... ___DIRECTIGNmONSYSTEM MODUlI

68 WHITE618ROWN

16 IGNITION SWITCHVOLTAGE INPUT SIGNAL' INKIBlACK

)9 GREENI 'NH fTE40 BlAC1


36/48

ENG IN E M ANAGEM ENT SY STEM S 1 .7 l TH RO TILE BODY IN JEC TIO N 2135

CHART C~4B(Page 2 of 2)D IRECT IGN IT ION SYSTEMM IS FIR E A T ID LE1.7L THROTTLE BODYINJEcrlON NIVA

,---------1: FROM PAGE :t 10f2 ,1-

CH ECK TH f ittslS T ANCEO f EACH PLUG CA IL O f THECO lL WH ICH 0 1 0 NOT F I It T HE S C :C I II II OAAYGN I TI ONVOLTAGUGNI nONTUTU .

C ... .. U IlU IS TA NC SH OU lD IELSS TH AN 'S ;O OOO HM S EA CH A N D C AllES SH OU LD H OTnR OU N DED ...I ll: C A IS LU OK ? . .'

~ EM O V E C O IL A ETA IN IN G N U TS A N D R EM O V E C O ilS . CO llS SHOU l.O 1 fR E OF C A L lIO N T RACK IN G .

: ~ ~ ~ ~ ' ~ ~ : f ~ # : , : ' ? ~ ~ ~ . ~ ~ ~ , " ' - T A . ~ ~ ~ , ~ ~ f 8 ~ , S PARK S HOU l.D i U t M S CONOA .V I G N m O N V O L T A G EIG NITIO N TU TU G A' AT P RO ilE M C Y UN D RWH Ilf

C R ANKI NG E NGIN E .Dlom

EI "l:A .C EK iN IT IO N C O IL A L SO C HEC K fOR. fAlJl .TY.Pl .UG tAtu: C OHNEC TIO N (S ) A ND(AiLE N IP Pl.U S) F O RC .lR lO N TR A CK IN G .

*'CAUTI()N: When handling secondary spark plugc~ble:s with engine running.insulated ,pliers must be Used:and care exe rcisedto prevent _apossib1e electrical shock.WAFTER REPA IR S , S TART ENG INE , CLEARCODES AND (ONARM NO CHE(KENGINEw UGHT.

VAl SERVia MANUAL THROTTLE 800Y INJECTION NIVA

42793NS 14450

185


37/48

-2-136 EN GINE M AN AG EM EN T SYSTEMS 1 .7L THROTT LE B ODY IN JEC TIO N -

A 21 BROWN _'!I15 PINK/StACK

UP CONNECTOR r- ,13WHfTE~:TAT~O:C!J - L . ..86 PINK/BLACK ------.....1

FUSE "Y" (GREEN)---I\}#-- 1 4 P INK /B tACK

68WHlTE67 BROWN


16 IG N ITIO N SWIT CHVOLTAG E IN PUT SIG NAL

D IR EC T I GN IT lO NSY STEM M OD ULE

PlNKIBLACK

39 GREENIWHIT40 BLACKIWHITE4 2 V I OLETIWH I TE58 BLACK/REO

EL EC TR ON IC S PA RKTIM IN G O UTP UTBYPASS M OD E CON TROLR E F E R E N C E IN PU T S IG NA LR E F E R E N C E l O W

CRANKSHAFTSENSOR

10-2292N514400

CHART C-4CDIREO' IGNITION SYSTEM MISFIRE UNDER LOAD1.7L THROTTLE BODY INJECTION NIVA

Circuit Description:The direct ignition system uses a waste spark method of distr ibution. In this type of system . the ignition moduletr iggers m e #1 /4 coil pa ir resulting in both #1 arid#4 spark plugs tiring a t the same tim e. #1 cylinder is on the com-pression stroke a t the same tim e #4 is on theexhauststroke, resulting in a low er energyrequirement to fire #4 sparkplug This leaves the remainder of the high voltag e to be used t o fire #1 spark plug . O n this applica tion the c rankshaftposition sensor is m ounted to th e engine block and p ro tr ud es to w ith in a pp ro xim a te ly .050" o f th e c ra nk sh aft reluctor,S ince the re luc tor is a machined portion of th e crankshaft and the c rankshaft sensor is m ounted in a fixed position on

the block. ti m ing adjustm ents a re not possib le or necessary.Test Description: Number(s) be low refer to c irclednum bert s) on the diagnostic chart.1 _ If the "M isfire" com pla int exists at idle only, diag-nostic CHART C -48 must b e used. A secondaryignition voltage ignition teste r J 26792 (ST-125)must be used because it is essentia l to verify ade-quate ava ilab le secondary voltage a t the spark plug(25.000 V olts). Spark should jump the [est gap on a ll

4 leads. This sim ula tes a "load" condition.::: If the spark jumps secondary ignition voltag e igni-tio n te ste r J 26792 (ST125) gap afte r g rounding theopposite plug w ire. it indica tes excessive resistancein the plug w hich was bypassed.

~.

A faulty or poor connec tion at tha t plug could alsoresult in the m iss condition. A lso check for carbondeposits inside the spark plug boot.3 . If ca rbon trac ing is evident. replace coil and be sureplug wires re la ting to tha t coil a re c lean and tight.Excessive wire resistance or faulty connec tionscould have caused the coil to be damaged .4. If the no spark condition follows the suspec ted coil,that coil is faultv . Otlc rw ise. the ignition m odule isthe- cause of no span. This test could a lso be per-formed by substituting a known good coil for theone c ausing the- n o spa rk c ondition.

.,~

--.i i .Io"

VAl SERVICEMANUAL THROTILE BODY INJECTION NIVA


38/48

ENGINE MANAGEMENT SYSTEMS 1.7L THROT TLE BODY INJECTION 2-137

8I F E HG II IIEM I SF IR ES A T I DL E ON LY', S E E C ~ Ail:T C"'.,_ JGN ,:TlOH O F F ," ,- ,Q lSCONN EctONE SPARK P lUG ,LUD AT A T IM AND ,I N STAU

S tC OH O AR Y iG N ITIO N V O LT AG E IG H lnO N T ES TE R J 267'2(ST,125). oaS ER VE S EC ON DA RY IG NITIO N V O LTA GE IG NflIO N TES T RW IT H E N G IN E I DL IN G , R EP EA T THI S Tf S T F O R AU PLUG

CA lLES. SEE CAUTION*- SPA RK SH OU LD JU MP SEC ON DA RY IG NITIO N V OL TA GIGNITION trs TER G AP O N A LL C AIL ( S W lTH EN GIN ( tO LIN G.

D IOIT?

CHART C-4CD IRECT IGN IT ION SYSTEMM ISF IRE ,UNDER LOAD1.7L THROTTLE BODYIN JECT ION N IVA

- W ITH IG NITIO N -O FF ,- U SE C ON NEC TO R TER MIN ALnST A DA PTER KITJ iS61' GROUND TH (OP f lOS ITP lU G C AIU O F TH E A fF ECTED CO IL A T SPA RK PlU G.- SPA RK SH OU LD JU MP SECO ND AR Y IG NITIO N V OL TA GEI GN IT IO N T ES TE R GA P WH IL E C R ANK IN G ENG IN E .DOES lno

',',

CH tC l( TH E RESIS lA NCE O f tA CH , PLU G CAIU O f THE,C O r L WH ICH 010NO T F IR E TH E S EC ONDA R Y I GN iT IO N

, '. ,,~ f~ l:::s~ ;~~~ t:~~ Jio":E 'L lSSTH ~~ :IS .i.oo' ', , .' O H,t.4:S 'EA CH AN [) A IlESSHO U~N OT IEG ltolJfliD EO .AU CA lLES OK ?

R EM O V E C O IL R ET AIN IN G H U TS A N D R EM O VE C OIL S.C O IL S SHOULD IE fR EE O F C AR lO N TR AC KIN G.

S WIT CH A N O RM A L L Y O PE RA TlN G C O il W IT H TH ECOil FROM PftOIUM CYUNDEI l SPARK SHO UlD JUM P SECO NDA RY IG NfTlO N

VOL1G E IG N IT IO N T ES TE R G A P W IT H EN G IN E ID U NG .DlDIT'J

C H EC K F O R: F AULTY ,WORN OR CRACKED S PA .R K P lUG (S j. P LU G fO U UN G D U E TO E NG IN E M EC H AN IC A L F A .UL T.IF S PA RK PlU GS C HEC K O U T O K. S EE -C UTS O UT.M ISS ES IN S YM PTO M S.- S EC TIO N -28-,

. REPLACE THE SPA RK PlU G F OR TH e CAlLE WHICHW AS JU MPU ED TO G RO UN D. IF M I SF IRE is STilL .P SE~ T;,$rA ~TM iS fIR ET~ sJA GA I" A T S TEP."., " ' . " " " ' ' ' ' ' ' " " ' ' " . . - . ; : . ; . ; ; ; . . . ; ' " " " ' ' ' c . . . . ; . ' ' ' ' ' " " ' ' " ' ' ' ' ' " " ' ' " _ . _ : . . . , ; _ ' ' ' ' ' " " ' ' " _ ' ' ' ' ' " " ' ' " _ - - ' - _ . . . J

. :R E .. .. . C I GN 'lr iO N 'C C '1 L A L SO C H EC K F O RfAUUY PLUG CAIU C ON NEctIO NS A NDC AlLE N IH lES F OR C AR lO N TR AC KIN G.

*CAUTION: When handling secondary spark plug cables with engine running.insulated pliers must be used and care exercised to prevent a possible electrical shock.-AFTER REPAIRS; S TART ENG INE . C L E A . R C OD ES A ND C ON FIR M N O -C HEC K EN GIN E- U GIfT, 62-92N S 1 43 80

V A l S ER V IC EM A N UA L THROTILE B ODY I NJ EC TIO N N IV A


39/48

2138 ENGINE MANAGEMENT SYSTEMS 1.7L THROlTLE BODY INJECTION . . .FUSE R (BLACK) 25

82P l N K IBLACK

ELECTRONICCONTROL MODULEiNKJ8LACK76 RED M A X I F U 5 E 7 7 R E D

B 1

I N T A K E M A N IF O L DElECTR!C H E A T E RR E L A Y CONTROL -

SOA P

79 8LACl( PINK/BLACKI N T AK E M A N IF O L DH E A T E R R E L A Y(black relay cOfInector)I N T AK E M A N IF O L DE L E C T R IC H E A T E R(loca tpd IJfIderintake manifold)

9-1$-92NS 14402

CHART C-9(Page 1 of 2)INTAKE MANIFOLD ELECTRIC HEATER1.7L THROTTLE BODY INJECTION NIVA . . .

Circuit Description:To assist in cold.driveability, the electronic control module controls a positive temperature coefficient heater. Thiselectric heating element is turned "ON" by the electronic control module by supplying a ground to a control relay at

the electronic control module's terminal "C2". The relay completes the circuit and supplies voltage from a 50 ampmaxi fuse to the heater.The heating element is self-current limiting, as its temperature increases its resistance increases. preventing ther-mal overheat and possible resultant short to ground.The electronic control module switches "ON" the heater based upon various inputs and conditions: Coolant temperature sensor is less than 63


40/48

.:

."

.. - ..

ENG INE M ANAGEM ENT SYSTEM S1 .7L THROTTLE BODY IN JEC TIO N 2139

CHART (-9(Page 1 of 2)INTAKE MANIFOLD ELECTRICHEATER1.7L THROTILE BODY INJECTION NIVA

@. C ONN EC T T EC H 1.SHECT ,, ,U SCEL IAHEOUS TES ts . .. THEH OUTJlUTrinS ."TH EH ..MANlf.


41/48

2-140 ENGINE MANAGEMENT SYSTEMS 1.7l THROTTLE BODY INJEGION -76 RED

79 BLACK 8 1

INTAKE MANIFOLDELECTRIC HEATERRELAY CONTROL

-FUSER (BLACK) 25

82PlN;;1BLACK

ElEGRONI(CONTROL MODULEINK/BLACK

:HEATINGELEMENTPINK/BLACK

INTAKE MANIFOLDHEATE R R EL AY(black relay connector, _ .INTAKE MANIFOLDELECTR IC HEATER(Located underintake manifold, -1592N5 14402

CHART C-9(Page 2 af 2)INTAKE MANIFOLD ELEaRIC HEATER1.7L THROTIlE BODY INJECTION NIVA

Circuit Description:To assist in cold driveabilitv, the electronic control module controls a positive temperature coefficient heater. Thiselectric heating element is turned "ON" by the electronic control module by supplying a ground to a control relay atthe electronic control module's terminal "C2" . " T h e relay completes the circuit and supplies voltage from a 50 ampmaxi fuse to the heater,The heating element is self-current limiting, as its temperature increases its resistance increases, preventing ther-. mal overheat and possible resultant shortto ground.The electronic control module switches "ON" th e heater based upon various inputs and conditions: Coolant temperature sensor is less than 63C. Engine is running. Intake air temperature is less than s e r e . B a tte ry voltage is greater than 8 volts.Gnce the heater has been "ON" the electronic control module will tum it "OFF," if me following conditions exist: B a tte ry voltage i s .less than 6 volts. (Heavy electrical accessory load.) Coolant temperature sensor input is greater than 65C.

. .

. .

Test Description: Numbers below refer to circlednumbers on th e diagnostic chan.3. Hearer must be tested at or about 27C. As theheater warms from 27C its resistance increases. Ifnecessary, remove and cool the heater. The heater'sresistance at 27C should be less than 0.3 ohms.4. This step checks Circuit 79 wire.5. This step simulates electronic control module con-trol of relay.6. This step will determine if the electronic controlmodule is defective or if Circuit 81 is faulty.

Diagnostic Aids:With ignition "ON,' engine running, use Tech 1"OUTPUT TEST' to rum "ON" heater. Observe "Sys-tem Voltage" on Tech 1. System voltage should drop atleast 0.3 volts with heater "ON." Engine must be idlingfor this Tech 1command to take effect.

Vf,Z SERVia MANUAL THROTILE BODY INJECiION NIVA190


42/48

.

.

.. ,\.~.. ... :

~~.:~;.\'

ENG INE M ANAGEMENT SY STEM S l.7 l THRO ITlE BODY IN JECTION 2'4 '

CHART (-9(Page 2 of 2)INTAKE MANIFOLD ELECTRICHEATERl.ll THROTTLE BODY INJECTION NIVA

: CO NTIN UE D FROM :PAGE 1 O F 2-T---------- J D ISC ON NEC T M AN IF OLD H EA TER EL EC T'U CA I. C ON NEC TO R. PER FO RM N EX TSTEP W ITH H EA TER A T R OO M TEM PER ATU RE. US ING D IG ITA L OHMM EnR . M fA SU RE RES ISTAN CE FROM HEATERCONNECTOR TO ENG INE 6! .O CK . SH OU lD BE B ETWE E N 0 .3 A NO 0 .50 H M S .IsinI.$ .: :..::.: $ If R M O V E 0 A T P REV IO US S1 "EI. R E 1 N S . T Au. H t A T E R IN TO IN TA IC E M A NIF O LD . C HEC K IN TA KE M AN IF OL D H EA TER H OL D RECONN eCT H EA Tn ELECTR ICAL CONN eCTO R : . D OWN 10LTS FOR CORR OS ION . AL SO US ING D IG ITA L OH MM ETER , M EASU Re ItES ISTA NCES leTWEEN RELAY IN SU RE TH AT TH EY A RE TIG HT. R EC HEC KCONNECTOR TERM INA L "2-A NO ENG IN E iLO (k GROUND . R ES IS TA NC E. If S TilL O Vt:R S PEC lf'C A TlO N R ES ISTAN CE SHOU LD NOT B E ZUO A ND SH OU LD IE A PP1 ! .O XIM A TEL Y TH E R fP LA CE IN TA KE M AN IF OL D H EA TER .SAM E AS M EA SU RE'O IN STEP 3 . R E C HE CK R E SiS TAN C E . IfS TI LL O V E RWHAT IS THE R f5IS 1 :A NCE '? SPEC ifICA TION REPLA CE INTAK E

M AN ifO LD H EA TER .'.: .-I I

.A ,P PR OX IM A TE L Y SA M E A S STEP 3 1 A L M OS "( Z eR O O HM sj O P EN C IR C U IT . NO CONT INU ITY I' .

. - ICONNECTTEST~ j ( iHTBE_ i "wEEN + 11 VOLT S AND

..

R EP AIR O PfN aR CU IT IN BLAt lC R EPA IR SlioR T TO G RO UN DRE lA . YC ON NEC TO R TER MrN AL 6-. n o ! C IR 9)IT1 ,IILA Ck W IR E W IR E IETW EEN H EA TER ! N GIN ! ID L IN G. U SE TECH 1 OU TP lIT TEST TO IETW tEN H EA rlR CONN ECTOR AND BLA CK R ! LA YTU RN O W M AN IFOLD H EA TER RELA YCDN TRO L CO NNECTO R AN D RELAY C O NN EC TO R T ER M IN A L "2".. . F R C iM ElECTRON IC CON TRO L M ODU U. CONNECTOR . TEST tiGH T SHO ULD L IG HT.OOE5 IT?$ -.~- - ... ~ E P ;LA - _a ,R E LAYW ITHNEV " t (!) C Q,~ ~E q:l:eS ! p G_ HT. ~ E_ TW EE N + 12 V O LT S A N D E LEC TR ON IC tO N TR O LRELAYANORETESTA nnp 1. .., -'MODl)lf TtRM IN A (;-"Q ,, ,. '. . .. . .. . . ., - ' , _ . ._ . ; - . . - . . . . . . . . . - . " E N G IN E ID I JN ~ . : . ' . . . . - . . . . . . . . . - . . . . . . ' _ . . ... . . .. U S E ' t E C H 1 : :t 1 U ' 1 :P V T r t s rr o TU RN "O N " AN .D O fF " M AN ifO LD H EA TERRe'lA)'c omoi.> .", _ _ -. .. ... .

TEST U G H T S H DU L O TlJ RN ON A ND OW".W 'H A TD OES TEST L IG HT 001

I j_ 1TU RN S "O N" AND OF F - J lSTAYS ON"" I S TA Y S O FfI IREPA IR OPfN C IRCU i t 10 REPA IR SH ORT TO G ROU ND I R ~P tA C E E LE CT RO N IC JP IN K /ILA CK WIRE. . I N C I RC U IT 10 P INK f l LACK C ON TR OL M OD UL E.BETWEEN ELECTRONIC W IR E B ETW EE N E LE CTR O NICcO tmo(M ODULE AND (ONTRO l MODULE ANDRELAYCO ' ; "NECTOR . R EL A Y C O N NE CT OR .

VA2 SERVICE MANUAL T HR O TT LE B OD Y INJECTION NIVA

11-3-92NS 135]2

91


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2-142 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION


AIR CONDfTlONINGREQUEST

-

AIRCONDIT lON ING

C O N TltO lUN IT

HIGH ENGINEHIGH/lOW COOlANTPRESSURE TEMPERAT1JRESWITCH SWITCH~ . . ~ - . - - - ' ~ ~ ' - - - - - ' " t - : - 3 : . ,M o ~ 84 GR.""

. .- - .. ., .. .. .- - I ~ . ~8S BLUE. . ., . . .. . . . . .. . . r " " " ' I ELECTRONICCONTROLMODULE

2""N AIR CONOmONINGHARNESS CONNECTOR

A I R (ONOmONINGClUTCH .

Circuit Description:A r eq ue st f or a ir c o nd itio nin g is sensed by th e e le ctr on ic c on tro l m od ule . W h en it has + 12 v olts a pp lie d to te nn i-na l "88". When the e lec tronic c ontro l m odule se nse s the a ir conditioning is re que sted , it will e ne rg ize th e a ir co nd i-tiorung C om pre ssor C lu tc h C on UbI re l ay by providing a g round pa th for ,the coil pa rt of the re lay. The re lay contac tsw ill c lo se , a nd c ur re nt will flow from the re lay and eng ag e the a ir conditioning C om pressor C lu tch .T he e le ctro nic c on tr ol m odu le d e-e ne rg ize s the r ela y u nd er th e fo llo win g c on ditio ns : If the throttle position se nsor is g re ate r than abou t 95%. No air conditioning requested . . C oolant tem pe ra rure is above about 1t 2C .,. Eng ine speed is above about 6375 revolut ions pe r minute . V ehic le speed le ss than 7 krtllh and throttle p ositio n g re ate r th an 50%.

Test Description: N um ber(s) b e low re fe r to circled Diagnostic Aids: .nu mb er(s) on th e diagnostic cha rt. The T ech 1 "S ca n" tool displa ys a ir c onditioningI. The a ir conditioning com pressor c lu tch should not request sig na l voltag e a t the e lec tronic com rol moduleeng age until about 0_ 3 second a fte r the output te st is "B8" .enabled . A snort to voltag e on C ircu it 84 G reen w ire to elec-2. With e ng in e id lin g and a ir c on dition ing d ash switch tronic control modu le te rm in al '88" w il l d is pl ay air

'ON: the e le c tronic contro l module should be conditioning re qu est .. Y es" in all positions of dashg rounding the re lay control c ircuit c ausing the te st sw itch.l ight to be O]\ ,_"

AIR CONDITiONINGRELAY 12

5--29--92NS 14679.

CHART C..10AIR CONDITIONING COMPRESSOR CtUTCHCONTROL

1.7L THROlTLEBODY INJECnON NIVA

VAZ SERVICEMANUAL THROTILE iiODY INJECTION NIVA,92

. . .


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ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2143

THIS CHART A SSU MES TH E A IRC O ND IT IO N IN G S YS TEM IS F UllY C HA RG EDAND IS IN PROPER WORKING CONOmON

CHART (-10A IR CONDITIONING COMPRESSORCLUTCH CONTROL1.7L THROTILE BODY INJECTION NIVA

IGN ITION "ON ." A lA CONOrnONING SWITCH"OH-llOWU CONnOl SWITCHON "HIGW SPEED. ENG INE IDUNG AT NORMAL O 'fu ,nN G nM 'EM TURE. USING TEC H 1 "S CA N- TO OL EN TU : M 1S CEU AH EO U.S nST." "O UTPU T TEST." AIRC ON O ITIO N IN G R EL AY TH IN fN AalE D lJl'P UT nSTTO CYCLERELAY '"ON" AND O ff,"

DOES A lR CONDrnOHING CO,..NUSOR nUTCH ENGAGE ANODISENGAG1

USIHGllCH ,"S CA N. D OES-A ll.: cp~Orn9NI"'G IlEQUfSTois,u. V"YES'"?

IG NmON "Off,"' D ISCONNECT 2PINAlIt CONDmo~INGHARNESS CONNECTOR lOCAnD UNDER

fNS1l!;U MENT 'ANElNtAA fUSE 'AN IL .. IG NITIO N "'Q H"EN GIN EIO UN .G . U SIN G TES tU GH T J J4 'C2~ CC;NNECTED TO+ lA , TTERV VOLTAGE .NOBE l P iH AIR ' .. co",omONIH(i KAANI$SCO"NtaOR."''''-,: "...~~~~~y~~;omoHltfGlI:QUEsr ......

FAULTY CONNECTlOtlroA9 .~ f ( 91 tSIiOJTTQ GROUND INalCU(J U'GIlEENWUlE(IElW EIN 2 P e N A l I ttR~.~~:~I_~,~HESS .CONNECTOR AND [UCTRONIC~ : '~C l . .M( )OUUTEi t 'MINAL.OR fAULTY EUCTRONICC ON TItO L M O DU LE.

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fMan CONNECTION O 'EN C lOR SHO ITTOD l 'f N Q I I.

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