Malfunction Indicator Lamp (MIL), Significance

Malfunction Indicator Lamp (MIL) Function

If a malfunction is recognized by the Engine Control Module (ECM) it is indicated by the MIL coming on.

Location of Malfunction Indicator Lamp (MIL)






NOTE:
When a recognized malfunction switches on the MIL, it will either blink or light continuously. In either case, DTC memory must be checked.
- If the MIL starts to blink, there is a malfunction that can lead to damage of the Three Way Catalytic Conveter (TWC). In this case, driving should only continue using reduced power. The malfunction must be rectified as quickly as possible.
- If the MIL lights continuously, there is a malfunction that affects exhaust emissions. In this case, DTC memory for the Engine Control Module (ECM) and Transmission Control Module (TCM) must be checked.
- Some malfunctions may occur without causing the MIL to come on. When driveability or performance problems are reported, and there is no indication from the MIL, DTC memory must be checked, as there may be DTCs stored that do not switch the MIL on immediately.