Malfunction Indicator Lamp (MIL): Description

When emission-related ECU detects a malfunction in the emission control systems components and/or the powertrain control components (which affect vehicle emissions), it turns on/blinks MIL to inform the driver that a malfunction has been detected.

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 "WIRING DIAGRAM ".
When the engine is started, the MIL should go off.

Fig 1: Identifying Malfunction Indicator Lamp

Courtesy of NISSAN NORTH AMERICA, INC.

NOTE: If MIL continues to illuminate/blink, perform self-diagnoses and inspect/repair accordingly because an emission-related ECU has detected a malfunction in the emission control systems components and/or the powertrain control components (which affect vehicle emissions).