Communication Circuit Troubleshooting

Cruise Control Communication Circuit Troubleshooting (A/T)

1. Start the engine.
2. Turn on the cruise control main switch, then drive the vehicle to 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 Powertrain Control Module (PCM) connector A (32P) and cruise control unit connector.




5. Check for continuity between the PCM connector terminal A5 and body ground.

Is there continuity?

YES - Repair a short in the wire between the PCM connector terminal A5 and the cruise control unit connector terminal No. 8.

NO - Go to step 6.

6. Reconnect PCM connector A (32P) and cruise control unit connector.
7. Turn the ignition switch ON (II).




8. Connect a voltmeter between cruise control unit 14P connector terminal No.8 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 9.

NO - Replace the cruise control unit.




9. 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 connections 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 A5 terminal and the cruise control unit connector terminal No. 8.