Key On Engine Running (KOER) On-Demand Self-Test: Notes

The KOER on-demand self-test is a functional test of the PCM, and is carried out on-demand with the key in the START position, the engine running and the vehicle stopped. A check of certain inputs and outputs is made during operating conditions and at a normal temperature. The brake pedal position (BPP) test is a part of the KOER on-demand self-test and must be carried out during this operation. A fault must be present at the time of testing for the KOER on-demand self-test to detect the fault. When a fault is detected, a DTC is output on the data link at the end of the test when requested by a scan tool. The KOER on-demand self-test can be executed with the gear selector in PARK only.