Key On Engine Running (KOER) On-Demand Self-Test
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The KOER on-demand self-test is a functional test of the PCM, and is carried out on-demand with the ignition 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.