Cruise Control Communication Circuit Troubleshooting (A/T)

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. Measure the voltage between the O/D control terminal of the cruise control unit connector and ground.

Is there approx. 1 V?

YES - Go to step 4.

NO - 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. 1 V?

YES - Check for loose connectors. If necessary, replace the TCM and recheck.

NO - Repair short or open in the wire between the TCM (or PCM) terminal and cruise control unit.