Propane EFI System
42
24 690 32 Rev. AKohlerEngines.com
Code 0171
Component: Fuel System
Fault: Maximum adaptation limit exceeded
Condition: Fuel fi lters plugged, low pressure at
high pressure fuel line, TPS malfunction,
shorted connection, faulty 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
Learn procedure.
● TPS problem or malfunction.
Engine Wiring Harness Related
● Difference 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 lock-off or
regulator).
● Combustion air (air cleaner dirty/
restricted, intake leak, throttle bores).
● Base engine problem (rings, valves).
● Exhaust system leak (muffl er, fl ange,
oxygen sensor mounting boss, etc.).
Code 0172
Component: Fuel System
Fault: Minimum adaptation limit exceeded
Condition: Too high pressure at high pressure fuel
line, TPS malfunction, shorted
connection, faulty sensor or regulator
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 17.
TPS Sensor Related
● Throttle plate position incorrect during
Learn procedure.
● TPS problem or malfunction.
Engine Wiring Harness Related
● Difference 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 regulator).
● Combustion air (air cleaner dirty/
restricted).
● Base engine problem (rings, valves).
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