4. Carry Out The Key On Engine Off (KOEO) On-Demand Self-Test

4. CARRY OUT THE KEY ON ENGINE OFF (KOEO) ON-DEMAND SELF-TEST

Purpose:
The purpose of this test is to determine if the PCM has detected any fault conditions that would cause a performance problem.

Carry Out The KOEO On-Demand Self-Test
- Use the scan tool. Diagnostic trouble code (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 Diagnostic Methods, Vehicle Check/Preparation. Vehicle Check/Preparation
- Refer to the scan tool operating manual for instructions.
- Ignition ON, engine OFF.
- Wait 4 seconds for the transmission control module (TCM), powertrain control module (PCM) and the fuel injector control module (FICM) to initialize.
- Follow the operating instructions from the diagnostic menu.
- Carry out a KOEO on-demand self-test.
- Record the DTCs, freeze frame information, and refer to the appropriate pinpoint test to continue diagnosis.

Tools Required:
Scan tool