Communication Circuit Troubleshooting
Cruise Control Communication Circuit Troubleshooting1. 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 14P connector.
5. Check for continuity between the PCM connector terminal AS and body ground.
Is there continuity?
YES - Repair a short to ground in the wire between the PCM connector terminal A5 and the cruise control unit 14P connector terminal No.8.
NO - Go to step 8.
6. Reconnect PCM connector A (32P) and cruise control unit 14P 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 - Substitute a known-good control unit. If the system works properly, replace the cruise control unit.
9. Connect a voltmeter between PCM connector terminal A15 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 or open in the BLU/GRN wire between the AS terminal and the cruise control unit.