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

KEY ON ENGINE OFF (KOEO) ON-DEMAND SELF-TEST

Key on engine off (KOEO) on-demand self-test is a functional test of the powertrain control module performed on demand with the key on and the engine off. This test will perform 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 fault. When a fault is detected, a diagnostic trouble code (DTC) will be output on the data link at the end of the test when requested by a scan tool.