Cruise control system – general information

1. The cruise control system maintains vehicle speed with the Powertrain Control Module (PCM), throttle actuator control motor, brake switch, control switches and associ­ated wiring. There is no mechanical connec­tion, such as a vacuum servo or cable. Some features of the system require special testers and diagnostic procedures that are beyond the scope of the home mechanic. Listed below are some general procedures that may be used to locate common problems.

2. Check the fuses (Fuses – general information).

3. The Brake Pedal Position (BPP) switch (or brake light switch) deactivates the cruise control system. Have an assistant press the brake pedal while you check the brake light operation.

4. If the brake lights do not operate properly, correct the problem and retest the cruise control.

5. Check the wiring between the PCM and throttle actuator motor for opens or shorts and repair as necessary.

6. The cruise control system uses information from the PCM, including the Vehicle Speed Sensor (VSS). Refer to Emissions and engine control systems for more information on the VSS, and to check for the presence of any stored Diagnostic Trouble Codes (DTCs).

7. If no obvious problems are found, take it to a dealer service department or other quali­fied repair shop for further diagnosis.