Cruise Control Inoperative/Malfunctioning

CRUISE CONTROL INOPERATIVE/MALFUNCTIONING

DIAGNOSTIC AIDS

CAUTION: Refer to SIR Caution in Service Precautions.

Disable the inflatable restraint steering wheel module when performing this diagnostic table. Refer to SIR Disabling and Enabling Zone 3 in Restraint Systems.

Perform the following in order to avoid misdiagnosis:
- Ensure that the following cruise control switches are not stuck in the engaged position:
- On/off switch
- Set/coast switch
- Resume/accel switch
- Inspect for proper operation of the stop lamps.
- With a scan tool, observe the cruise control function switch parameters, in the powertrain control module (PCM) Cruise Control Data list, while rotating the steering wheel to both steering stops and individually activating each cruise control function switch separately. This will help eliminate the possibility of an internally shorted inflatable restraint steering wheel module coil.
- For an intermittent condition,

TEST DESCRIPTION

Step 1 - Step 8:

Step 9 - Step 13:

Step 14 - Step 21:

Step 22 - Step 26:

The number below refers to the step number on the diagnostic path.
6. This step tests the vehicle speed signal circuit for a short to ground, for a short to voltage, for an open, or for a high resistance between the PCM and the TAC module.
8. This step tests the ignition 1 voltage circuit for a short to ground, for an open, or for a high resistance.
9. This step tests the cruise control set/coast and resume/accelerate switch signal circuit for a short to voltage.
10. This step tests the cruise control set/coast and resume/accelerate switch signal circuit for a short to ground, for a short to voltage, for an open, or for a high resistance.
26. DTCs will set in the powertrain control module (PCM) when you perform this diagnostic table.