Cruise Control: Testing and Inspection

TROUBLESHOOTING

CRUISE CONTROL SYSTEM

NOTE:
Before troubleshooting :
- Check the ECM(10A), Horn(10A), ECU #3(10A) and ECU B+(15A) fuse in the under - hood fuse/relay box.
- Check that the horn sounds.
- Check the tachometer to see if it works properly.





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 (40km/h) with the cruise control.

Does the cruise control operate ?
- Go to step 3.
- Check the cruise control unit or cruise control actuator.
3. Measure the voltage between the O/D control terminal of the cruise control unit connector and ground.

Is there approx. 1V?
- Go to step 4.
- Replace the cruise control unit.




4. Measure the voltage between the cruise control terminal of the TCM(or PCM) connector and ground.









Is there approx. 1V?
- Check for loosen connectors. If necessary replace the TCM and recheck.
- Repair short or open in the wire between the TCM (or PCM) terminal and cruise control unit.