CHECK ENGINE indicator lamp: Notes

Fig 1: Checking Engine Indicator Lamp

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Checking Engine Indicator Lamp Wiring

Courtesy of SAAB-SCANIA OF AMERICA, INC.

The CHECK ENGINE lamp (MIL) warns the driver when a fault occurs in the engine management system.

The lamp is supplied with current (+15 circuit) in the control module and grounded via terminal 8 (K20) in the engine management system's control module.

In certain markets the transmission control module (TCM) sends a signal to the Trionic requesting it to light the CHECK ENGINE warning lamp (OBDII).

With the ignition ON the lamp remains on until the engine starts. If there are no faults the lamp will go out.