Key On Engine Off (KOEO) On-Demand Self-Test

The KOEO on-demand self-test is a functional test of the PCM carried out on-demand with the key on and the engine off. This test will carry out checks on certain sensor and actuator circuits. A fault must be present at the time of testing for the KOEO self-test to detect the concern. When a concern is detected, a DTC is output on the data link at the end of the test as requested by a diagnostic tool.