Introduction to Cruise Control System Diagnosis

AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS

INTRODUCTION TO AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS
The auto-cruise control system allows driving without stepping on the accelerator pedal by setting a random speed between 40 km/h (25 mph) and 200 km/h (124 mph). Malfunctions in this system can be investigated by the following methods.

Auto-cruise control system diagnostic trouble codes
The auto-cruise control system consists of the engine control module (ECM) [M/T] or powertrain control module (PCM) [A/T], control switches and sensors. The control switches and sensors monitor the state of the vehicle. The ECM [M/T] or PCM [A/T] controls the throttle valve opening angle in the throttle body in accordance with the input signals from the switches and sensors. If the PCM detects a malfunction on any of those components, the ECM [M/T] or PCM [A/T] estimates where the problem may be occurring, and will set a diagnostic trouble code. Diagnostic trouble codes cover the auto-cruise control switch, stoplight switch and ECM [M/T] or PCM [A/T].