49
EFI System
66 690 14 Rev. A
KohlerEngines.com
Code 0174
Component: Fuel System
Fault:
Lean fuel condition
Condition:
Fuel inlet screen/
fi
lter plugged, low
pressure at high pressure fuel line, TPS
malfunction, shorted connection or faulty
sensor.
Conclusion: TPS Learn Incorrect
●
Lean condition (check oxygen sensor
signal with VOM and see Oxygen
Sensor).
Engine Wiring Harness Related
●
Pin circuit wiring or connectors.
ECU pin Black 10, 12, 16 and 17.
Low Fuel Pressure
●
Plugged
fi
lters.
●
Fuel pressure regulator malfunction.
●
Fuel pump malfunction.
Oxygen Sensor Related
●
Sensor connector or wiring problem.
●
Exhaust leak.
●
Poor ground.
Poor system ground from ECU to engine,
causing rich running while indicating lean.
Fuel pump connection. See Fuel
Components.
Code 0201
Component: Fuel Injector
Fault:
Injector 1 Circuit Malfunction
Condition:
Injector damaged or faulty, shorted or
open connection.
Conclusion: Injector Related
●
Injector coil shorted or opened.
Engine Wiring Harness Related
●
Broken or shorted wire in harness.
ECU pin Black 5.
●
Wiring from Ignition.
ECU Related
●
Circuit controlling injector #1 damaged.
Code 0202
Component: Fuel Injector
Fault:
Injector 2 Circuit Malfunction
Condition:
Injector damaged or faulty, shorted or
open connection.
Conclusion: Injector Related
●
Injector coil shorted or opened.
Engine Wiring Harness Related
●
Broken or shorted wire in harness.
ECU pin Black 6.
●
Wiring from Ignition.
ECU Related
●
Circuit controlling injector #2 damaged.
Code 0230
Component: Fuel Pump
Fault:
Circuit Low Voltage or Open
Condition:
Shorted or open connection.
Conclusion: Fuel Pump Related
●
Fuel pump open or shorted internally.
Engine Wiring Harness related
●
Broken or shorted wire in harness.
ECU pin Black 9 or Grey 17.
ECU Related
●
ECU is damaged.
Code 0232
Component: Fuel Pump
Fault:
Circuit High Voltage
Condition:
Shorted connection.
Conclusion: Fuel Pump Related
●
Fuel pump damaged internally.
Charging Output System Too High.