Self-Diagnostic System: Notes

Vehicle uses a Engine Control Module (ECM).

The ECM is equipped with a self-diagnostic system, which detects system failures or abnormalities. When a malfunction occurs, ECM will illuminate the CHECK ENGINE light located on instrument cluster. This light is also referred to as the Malfunction Indicator Light (MIL). When malfunction is detected and MIL is turned on, a corresponding trouble code will be stored in ECM memory. To retrieve stored codes, see READING TROUBLE CODES or RETRIEVING CODES (NON-SCAN). Malfunctions are recorded as HARD FAILURES or as INTERMITTENT FAILURES.