kubota engine america service training kubota engine training: wg1605, spark ignited

KUBOTA ENGINE AMERICAService

Training

Kubota Engine Training: WG1605, spark ignited

KUBOTA ENGINE AMERICA Service

Training

WG1605 Engine Training: System OverviewsMechanical Components Electronic Components and

SensorsOperationService Tool


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Fuel System Overview:


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Mechanical Components: WG1605 engines are similar to

V1505. Some differences include:

Intake and exhaust manifolds. Positive Crankcase Ventilation

system. Pistons. Cylinder heads and valves. Crankcase, Camshaft.


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Intake & Exhaust Manifolds:

Exhaust manifolds are shielded and engineered for higher temperatures

Intake manifolds use longer runners


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Positive Crankcase Ventilation (PCV) System:

PCV Valve

Controls amount of blow-by gas and fresh air.


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Flywheel: The WG1605 flywheel is designed to work alongside the crankshaft sensor.


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Fuel Delivery Pipe and Injectors: ECU controlled fuel delivery (pulse width modulated).

Port Fuel InjectionFuel Pressure 40 – 45 PSI**(can fluctuate between 35-75#)


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Fuel Delivery Pipe and Injectors:


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Three Way Catalyst: A 3-way catalyst oxidizes:

(1)HC CO2 and H20

(2) CO CO2

(3) NOx N2


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Electronic Control Unit, ECU:

Utilizes inputs from the engine sensors to precisely meter fuel, control speed and remain emission compliant.


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Electronic Control Unit, ECU:


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Ignition Coil: ECU controlled inductive coils.

As primary windings dwell then collapse, the secondary windings yield a high voltage output via the spark plug.


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Fuel lines are bold black color. Electrical circuits are thick

black.

Gasoline System:


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Variable controlled by ECU.

Electric Fuel Pump:


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Electric Fuel Pump:


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Press/Temp Sensor

Manifold

Return

Inlet

Outlet

Fuel Pressure Manifold, FPM:


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Fuel Inlet

Fuel Outlet

Coolant Primary

Secondary

Regulator performs 2 functions: Vaporizes liquid fuel Regulates fuel pressure

Only maintenance is periodic draining See maintenance schedule

Dual Stage Regulator, DSR:

Test Port


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Stand alone module Controlled via CAN from ECU Contains:

Control ModulePressure/Temp. sensorFast acting solenoid valve

DEPR (Direct Electronic Pressure Regulator):


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Engine Coolant Temperature:


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Oil Pressure Switch: If oil pressure falls below specification, the warning lamp will illuminate. (ECU pin 35) Note: water ingress may also cause the contacts to corrode and cause false illumination, especially with LEDs.


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Oil Pressure Switch: Standard Kubota Oil Pressure Switch:

Closed: 0-7 psiOpen > 7psi


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Electronic Throttle Body, ETB

ECU controlled, electronic motor driven mechanical throttle body connected to the intake.


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Electric motor connected to throttle.

ECU controlled based on foot pedal input.

Electronic Throttle Body, ETB


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Oxygen (O2) Sensor: Pre and Post catalyst feedback control for precise air-fuel ratio management.

4 wire sensor including heater.


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Pre- and Post-Catalyst Oxygen sensors

Oxygen (O2) Sensor:


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Heated for more accuracy, beyond exhaust temps.

HEGO1 (pre-cat) senses rich/lean to adjust fuel mixture.

HEGO2 (post-cat) checks catalyst for efficiency.

Oxygen (O2) Sensor:


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Bosch LSF4 sensor Pre-cat used for closed loop fuel control Used as a rich-lean switch Only 1 DTC: EGO 1 Open/Lazy

Pre-Cat O2 Sensor:


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Bosch LSF4 sensor Post-cat used mainly for catalyst efficiency checking Post cat O2 failure should not cause an engine running

problem Only 1 DTC: EGO 2 Open/Lazy

Post-Cat O2 Sensor:


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Temperature and Manifold Absolute Pressure Sensor: TMAP.

Mounted in the intake manifold and provides ECU data to calculate air flow pressure and density.


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Combines both intake air temperature and intake manifold pressure

Will compensate for intake temperature, altitude, and air cleaner restriction

Temperature and Manifold Absolute Pressure Sensor:


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Crankshaft Position Sensor:

Provides engine RPM information to the ECU.


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Crankshaft Position Sensor:


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Camshaft Position Sensor: Identifies which cylinders are in compression to begin spark timing.


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Camshaft Position Sensor:


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Knock Sensor: Early detonation detection via mechanical vibration at the cylinder head/block deck level.


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Reacts with a specific frequency from detonation.

When knock is detected, voltage output is increased.

ECU retards ignition timing.

Installed sensor at 35 – 50 degrees from vertical.

Knock Sensor:


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Service ManualsWorkshop & Diagnosis Manuals


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Service ToolE-Com Interface Device

Connects between USB port and connection on engine

Can be connected any time, engine running or not


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Service ToolInterface Connector


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Service ToolSoftware

Interface available through KEA’s Parts Department.

Software is Free, and available for download through K-ISS.


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GCP Display – Gauge Page


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GCP Display – Tests Page


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GCP Display – Test Page


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GCP Display – Faults Page

kubota engine america service training kubota engine training: wg1605, spark ignited

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