7. Carry Out the Key on Engine Off (KOEO) On-Demand Self-Test
7. CARRY OUT THE KEY ON ENGINE OFF (KOEO) ON-DEMAND SELF-TESTPurpose:
The purpose of this test is to determine if the PCM has detected any fault conditions that would cause a hard start or no start condition.
Carry Out The KOEO On-Demand Test
- Use the scan tool. Diagnostic trouble codes (DTCs) set during this test are current faults.
Recommended Procedure:
NOTE: To verify that the DTC is a hard fault, clear continuous DTCs first (be sure to record all DTCs and freeze frame information before clearing). Repeat the KOEO on-demand self-test. If the DTC is set again, a hard fault has occurred.
Connect the scan tool. Turn off all accessories. If the vehicle is equipped with a power take-off (PTO) system or auxiliary idle control, it must be turned off to carry out the self-test.
- Carry out the necessary vehicle preparation and a visual inspection. Refer to Quick Test Operation.
- Refer to the scan tool operating manual for instructions.
- Key ON, engine OFF.
- Wait 4 seconds for the transmission control module (TCM), PCM, and the FICM to initialize.
- Follow the operating instructions from the diagnostic menu.
- Carry out a KOEO on-demand self-test.
- Record the DTCs and freeze frame information and refer to the appropriate pinpoint test.
Possible Causes:
The most likely PCM detectable faults that cause a no start or hard start condition are:
- CMP sensor inactive fault
- CKP sensor inactive fault
- IPR output circuit check fault
- FICM enable circuit fault
Tools Required:
Scan tool