Electronic Control Module (ECM)

Electronic Control Module (ECM) constantly monitors and compares set speed with actual vehicle speed from input sensors. When vehicle speed is greater than set speed, ECM activates actuator motor to close engine throttle plate, reducing vehicle speed. When vehicle speed drops to less than set speed, ECM activates actuator motor to open engine throttle valve, increasing vehicle speed.

ECM includes a self-diagnostic function. If cruise control system is canceled by any condition other than driver operation, ECM assumes a malfunction has occurred and may set a corresponding trouble code. If cruise control is automatically cancelled, and CRUISE indicator light flashes, a Diagnostic Trouble Code (DTC) has been stored. See DIAGNOSTIC PROCEDURE  under SELF-DIAGNOSTIC SYSTEM.