Engine Control Module

Cruise control Electronic Control Unit (ECU) is integrated into the Engine Control Module (ECM). The ECM constantly monitors and compares set speed with actual vehicle speed from input sensors. When vehicle speed is different from set speed, ECM activates throttle control motor to change engine throttle valve, changing 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. ECM is located below passenger's side of instrument panel, underneath carpet.