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

Key On Engine Off (KOEO) is a functional test of the Powertrain Control Module (PCM) performed on demand. A fault must be present at the time of testing for the Self-Test to detect the fault. This test will perform checks on certain sensor and actuator circuits. A Diagnostic Trouble Code (DTC) will be output on the data link at the end of the test when requested by the New Generation Star (NGS) tester. Only system pass, hard fault code or an incomplete OBD II drive mode will be displayed.