Malfunction Indicator Lamp (MIL), Significance

Malfunction Indicator Lamp (MIL), Significance

The Malfunction Indicator Lamp (MIL) lights up when malfunctions are recognized by the Engine Control Module (ECM).

Malfunction Indicator Lamp (MIL):

Installation position of exhaust MIL

NOTE:
The Malfunction Indicator Lamp (MIL) can blink or be lit continuously. DTC memory should be checked in both cases.
- Blinking: There is a malfunction that damages the catalytic converter in this driving condition. In this case, vehicle must only be driven at reduced power!
- Continuously lit: There is a malfunction that causes increased emissions. Check DTC memory for Motronic ECM or automatic transmission.
- DTC memory must still be checked if there are driveability problems or the customer has made a complaint but the MIL is not lit, because malfunctions can be stored without causing the MIL to light immediately.