Key ON Engine Running (KOER) Self-Test
WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The KOER self-test is a functional test of the PCM carried out with the engine running. The temperature must be above 60°C (140°F) for the KOER self-test to operate. A check is made on the fuel rail pressure (FRP) sensor, turbocharger, and exhaust gas recirculation (EGR) systems. During this test, the engine RPM may vary. The brake pedal position (BPP) test is a part of the KOER self-test and must be carried out during this operation. A concern must be present at the time of testing for the KOER self-test to detect a concern. If a concern is detected, a DTC is output on the data link at the end of the test when requested by the scan tool.