Key ON Engine Running (KOER) On-Demand Self-Test: Notes
WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
Key On Engine Running (KOER) is a functional test of the PCM performed on demand with the engine running and vehicle stopped. A check of the inputs and outputs is made during operating conditions and at normal temperature. The brake on/off, transmission control and power steering pressure switch tests are part of the KOER self-test and MUST be performed during this operation (see below). A fault must be present at the time of testing to detect the fault. A DTC will be output on the data link at the end of the test when requested by the WDS or equivalent. Only system pass, hard fault code or an incomplete OBD II drive mode will be displayed.