How to Solve Trouble Code 0031 and 0032 for Kohler ECH440 EFI System

This is an instruction show guide on how to solve Kohler ECH440 EFI system trouble code 0031 and 0032.

Code 0031
NOTE: Codes 0031 and 0032 may have been mistakenly activated by turning key ON with
oxygen sensor disconnected. If either code status is historic, that code may have set during
assembly or a previous repair and may not be related to current event. Clear codes and retest
to confirm. If code status is current, refer to Oxygen Sensor (O2) earlier in this section, to
test and troubleshoot.

Component: Oxygen Sensor Heater

Fault: O2S Heater Circuit Low Voltage

Condition: System voltage too low, open connection or faulty sensor.

Conclusion: Engine Wiring Harness Related
● Pin circuit wiring or connectors.
ECU black pin 7 or broken wire.
Oxygen Sensor Related
● Sensor connector or wiring problem.
Poor system ground from ECU to engine or battery to engine.

Code 0032
NOTE: Codes 0031 and 0032 may have been mistakenly activated by turning key ON with
oxygen sensor disconnected. If either code status is historic, that code may have set during
assembly or a previous repair and may not be related to current event. Clear codes and retest
to confi rm. If code status is current, refer to Oxygen Sensor (O2) earlier in this section, to
test and troubleshoot.

Component: Oxygen Sensor Heater

Fault: O2S Heater Circuit High Voltage

Condition: System voltage too high, shorted connection or faulty sensor.

Conclusion: Oxygen Sensor Related
● Sensor connector or wiring problem.
● Sensor damaged.
● Pin circuit wiring or connectors at Black7.

ECU Related
● ECU-to-harness connection problem.

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