Kohler ECV940 Service Manual page 50

EFI SYSTEM-ELECTRONIC THROTTLE BODY (ETB)
Fault Code MIL Blinks
Code P0171 1/10/8/13
Component: Fuel System
Fault: Maximum adaptation limit exceeded
Condition: Fuel inlet screen/fi lter plugged, low
pressure at high pressure fuel line, TPS
malfunction, shorted connection, faulty
O2 sensor, low fuel or wrong fuel type.
Conclusion: Oxygen Sensor Related
● Corrosion or poor connection.
● Sensor contaminated or damaged.
● Air leak into exhaust.
● Poor ground path.
● Pin circuit wiring or connectors.
ECU Black pin 10 or Black pin 17.
TPS Sensor Related
● Throttle plate position incorrect during
Auto-Learn.
● TPS problem or malfunction.
Engine Wiring Harness Related
● Diff erence in voltage between sensed
voltage and actual sensor voltage.
● Problem in wiring harness.
● ECU-to-harness connection problem.
Systems Related
● Ignition (spark plug, plug wire, ignition
coil).
● Fuel (fuel type/quality, injector, fuel
pressure too low, fuel pump module or
lift pump).
● Combustion air (air cleaner dirty/
restricted, intake leak, throttle bore).
● Base engine problem (rings, valves).
● Exhaust system leak (muffl er, fl ange,
oxygen sensor mounting boss, etc.).
● Fuel in crankcase oil.
50
SPN FMI
4237 0
KohlerEngines.com
Fault Code MIL Blinks
Code P0172 1/10/8/13
Component: Fuel System
Fault: Minimum adaptation limit exceeded
Condition: Too high pressure at high pressure fuel
line, TPS malfunction, shorted
connection, faulty O2 sensor or fuel
pump module failure.
Conclusion: Oxygen Sensor Related
● Sensor connector or wiring.
● Sensor contaminated or damaged.
● Poor ground path.
● Pin circuit wiring or connectors.
ECU Black pin 10 or Black pin 17.
TPS Sensor Related
● Throttle plate position incorrect during
Auto-Learn.
● TPS problem or malfunction.
Engine Wiring Harness Related
● Diff erence in voltage between sensed
voltage and actual sensor voltage.
● Problem in wiring harness.
● ECU-to-harness connection problem.
Systems Related
● Ignition (spark plug, plug wire, ignition
coil).
● Fuel (fuel type/quality, injector, fuel
pressure too high, fuel pump module or
lift pump).
● Combustion air (air cleaner dirty/
restricted).
● Base engine problem (rings, valves).
● Fuel in crankcase oil.
● Fuel pump module is over fi lled.
● Lift pump diaphragm is ruptured.
SPN FMI
4237 1
62 690 05 Rev. H