Engine Control Module: Service Precautions

The ignition switch supplies "On" and "Start" information to the ECU to position the idle speed control components. The ignition switch "ON" signal is provided to the ECU through the control relay. Refer to the images below for the "START" signal.

Inhibitor Switch (A/T) Circuit:

AUTOMATIC TRANSMISSION

Ignition Switch (M/T) Circuit:

MANUAL TRANSMISSION