Component Tests and General Diagnostics
Cruise Control Communication Circuit Troubleshooting1. Start the engine.
2. Turn on the cruise control main switch, then drive the vehicle at speeds over 25 mph (40 km/h) with the cruise control.
Does the cruise control operate?
YES - Go to step 3.
NO - Check the cruise control unit or cruise control actuator.
3. Turn the ignition switch OFF.
4. Disconnect the negative cable from the battery.
5. Disconnect Powertrain Control Module (PCM) connector A (32P) and the cruise control unit 14P connector.
6. Check for continuity between PCM connector terminal AS and body ground.
Is there continuity?
YES - Repair a short in the wire between PCM connector terminal A5 and the cruise control unit 14P connector terminal No.8.
NO - Go to step 7.
7. Reconnect PCM connector A (32P) and the cruise control unit 14P connector.
8. Reconnect the negative cable to the battery.
9. Connect a voltmeter between the No.8 terminal of the cruise control unit 14P connector and body ground. Test drive the vehicle at speeds over 25 mph (40 km/h) with the cruise control set, and watch the voltmeter.
Is there about 1 V?
YES - Go to step 10.
NO - Substitute a known-good control unit. If the system works properly, replace the cruise control unit.
10. Connect a voltmeter between PCM connector terminal A5 and body ground. Drive the vehicle at speeds over 25 mph (40 km/h) with the cruise control set, and watch the voltmeter.
Is there about 1 V?
YES - Check for loose connectors of the BLU/GRN wire between the cruise control unit and the PCM. If necessary replace the PCM and recheck.
NO - Repair open in the wire between the PCM connector terminal A5 and the cruise control unit 14P connector terminal No.8.