Introduction to 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). Problems 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) or powertrain control module (PCM) , control switches and sensors. The control switches and sensors monitor the state of the vehicle. The ECM or PCM controls the throttle valve opening angle in the throttle body in accordance with the input signals from the switches and sensors. If the ECM or PCM detects a problem on any of those components, the ECM or PCM 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 or PCM .