Malfunction Indicator Lamp: Description and Operation

PURPOSE
If a fault occurs in the engine management system, the diagnostic module (N59) will illuminate the "CHECK ENGINE" light (A1e26), alerting the driver of an emission related malfunction, and the control module will record the fault. The technician can extract the fault codes and use them to diagnose the problem.

LOCATION
The check engine light is located in the instrument panel.

OPERATION
The "CHECK ENGINE" light is supplied with a voltage from the base module (N16/1). It is grounded by the diagnostic module (N59). For a functional check, the light illuminates for up to 30 seconds after starting the engine. If no system malfunctions are present, the "CHECK ENGINE" light goes out. If a malfunction is present, the "CHECK ENGINE" light stays illuminated until the fault code memory is cleared.