Malfunction Indicator Lamp (MIL)

WARNING: This page is about a different car, the 2019 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

When detecting a DTC that affects exhaust gas, the exhaust emission-related control module transmits a malfunction indicator lamp signal to ECM via CAN communication line.

Courtesy of NISSAN NORTH AMERICA, INC.

ECM prioritizes (MIL: ON/blink) the signal received from the exhaust emission-related control module and the ECM-stored DTC that affects exhaust gas and transmits a malfunction indicator lamp signal to the combination meter via CAN communication line.

The combination meter turns ON or blinks the MIL, according to the signal transmitted from ECM, and alerts the driver of malfunction detection.
Control modules that a DTC of MIL ON/Blink is stored (Control module varies among DTCs.):
- ECM
- TCM

The MIL illuminates when ignition switch is turned ON (engine is not running).
NOTE: Check the MIL circuit if MIL does not illuminate. Refer to Component Function Check .
When the engine is started, the MIL should go off.
NOTE: If MIL remains ON or continues blinking, a DTC(s) that affects exhaust gas is detected. In this case, Self-diagnosis is required for performing inspection and repair.