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JF613ELow/Reverse Sprag RotationAllJune, 2014

Technical Bulletin #1617

JF613ELow/Reverse Sprag Rotation

MS • of 1Copyright © 2014 ATRA All Rights Reserved



ZF4HP16 FWDRange Switch Testing: P0705Suzuki Forenza, Reno, VeronaJune, 2014


ZF4HP16 FWDRange Switch Testing: P0705On the ZF4HP16 FWD the range switch is a common failure. Use the following connector view and chart to test the operation of the switch. To test the switch use connector view figure 1.

JW • Page 1 of 2Copyright © 2014 ATRA All Rights Reserved

Figure 1

JW • Page 2 of 2 Copyright © 2014 ATRA All Rights Reserved

#16181. Confirm battery power on pins 1 & 72. Confirm reverse lights work. If not inspect pin 8, pin 8 feeds power to the reverse lights when in

reverse.3. Does the car start in Park and Neutral? If yes pins 9 & 10 are good. Pin 9 grounds the PNP relay

when in Park and Neutral. Pin 10 is a ground at all times.4. Next, check each switch in each range. Test L1, L2, L3 and L4. Compare voltages to chart (figure 2)

in each range.

ZF4HP16 FWDRange Switch Testing: P0705

L1 L2 L3 L4

Park 0 0 12 0

Reverse 0 0 0 12

Neutral 0 12 0 0

Drive 12 12 12 0

D3 12 12 0 12

D2 12 0 12 12

1st 0 12 12 12

Range Switch

Figure 2



4L65E/4L70EBurnt 2-4 Band OnlyGMJune, 2014


4L65E/4L70EBurnt 2-4 Band Only

LW • Page 1 of 1Copyright © 2014 ATRA All Rights Reserved

Some late model cases are not machined properly. If you get a unit in the shop and the only issue is the 2-4 band burnt, pay close attention to the servo bore. If the servo bore is not fully machined as shown on the left, the srevo pin will catch on the rig and drag the band.

To repair this issue, use a dremel to finish the bore travel area as shown in the illustration on the right.

Thanks to James Laughlin from Denver Colorado for the info.



F4A40-50 SeriesBind in Reverse, Forward Ok After RebuildAllJuly, 2014


F4A40-50 SeriesBind in Reverse, Forward Ok After RebuildThese symptoms can be caused by a missing Failsafe Valve Retainer that was lost during rebuild (figure 1).

Special thanks to Manny & Jeff at Dynamic Transmissions in Deerfield Beach Florida.

MS • Page 1 of 1Copyright © 2014 ATRA All Rights Reserved

Figure 1



ZF6HP26/6R60Erratic, Flaring 4-5 and 5-4 Shifts, Pressure Control ProblemsBMW, JaguarJune, 2014


ZF6HP26/6R60Erratic, Flaring 4-5 and 5-4 Shift, Pressure Control ProblemsA worn Clutch E Control valve (pictured below) can cause these concerns. Simply replace the part to fix the problem.

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U660E, U660F, U760E, U760FDelayed, Slipping or a No ReverseEngagementToyotaJune, 2014


U660E, U660F, U760E, U760FDelayed, Slipping or a No Reverse EngagementWhile working on a U660E, U660F, U760E or a U760F transmission, you may encounter a delayed, slipping or no reverse engagement. This concern may be caused by a worn B2 Apply Control Valve and bore or a worn B2 Control Valve and bore. Replacing the B2 Apply Control Valve and B2 Control Valves and repairing the worn bores may be needed to repair this concern.




ZF6HP26, 6R60Erratic, Flared or Harsh Shifts, Wrong Gear Starts or Bind Ups During ShiftsBMW, JaguarJune, 2014


ZF6HP26, 6R60Erratic, Flared or Harsh Shifts, Wrong Gear Starts, Bind UpsWhile working on a ZF6HP26 or 6R60 transmission, you may encounter erratic, flared or harsh shifts. You may also encounter wrong gear starts or bind-ups during shifts. This concern may be caused by a worn Solenoid Pressure Regulator valve. Replacing the solenoid Pressure regulator valve may be need-ed to repair this concern.




F5A SeriesForcing the ShiftMitsubishi/Hyundai/KiaJune, 2014


F5A SeriesForcing the Shift

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1st Gear

2nd Gear

3rd Gear

4th Gear

5th Gear

1 Oil Temp Ret Voltage2 Oil Temp Ground3 UD Solenoid4 2C Solenoid5 OD Solenoid6 L/R Solenoid7 Damper Clutch Solenoid8 Reduction Soleniod9 Battery Voltage

10 Battery Voltage

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