A-2: Malfunction Indicator Light Remains On: Condition

When ignition switch is turned to ON position, main relay is energized by the Engine Control Module (ECM, manual transmission) or Powertrain Control Module (PCM, automatic transmission) and supplies ECM (PCM) with main power. As ECM (PCM) is supplied with main power, it will turn ON the MIL. After engine starts, MIL will turn OFF if no malfunction is detected. If a malfunction is detected, MIL will remain ON until system is repaired.