System Diagnosis

The PCM continuously monitors transmission operation and contains a self-diagnostic system which stores a Diagnostic Trouble Code (DTC) if an electronic control system problem or component failure is present. A 4-digit OBD-II DTC is used in the self-diagnostic system for diagnosis. OBD-II DTC is stored in the Powertrain Control Module (PCM) and illuminates the Malfunction Indicator Light (MIL) when set. If OD/OFF indicator or MIL indicates a system malfunction, retrieve DTC using desired method. See RETRIEVING TROUBLE CODES  .