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 actuator.
3. Turn the ignition switch OFF.
4. Disconnect powertrain control module (PCM) connector A (32P) and the cruise control actuator 12P connector.
5. Check for continuity between PCM connector A terminal No. 5 and body ground.
Is there continuity?
YES - Repair a short to ground in the wire between PCM connector A terminal No. 5 and cruise control actuator 12P connector terminal No. 10.
NO - Go to step 6.
6. Check for continuity between PCM connector A terminal No. 5 and cruise control actuator 12P connector terminal No. 10.
Is there continuity?
YES - Go to step 7.
NO - Repair open in the wire between PCM connector A terminal No. 5 and cruise control actuator 12P connector terminal No. 10.
7. Reconnect the PCM connector A (32P) and the cruise control actuator 12P connector.
8. Connect a voltmeter between PCM connector A terminal No. 5 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 - Check for loose connectors of the BLU/GRN wire between the cruise control actuator and the PCM. If necessary replace the PCM and recheck.
NO - Substitute a known-good actuator. If the system works properly, replace the cruise control actuator.