Cruise Control Inoperative/Malfunctioning

Cruise Control Inoperative/Malfunctioning

Diagnostic Aids

Perform the following in order to avoid a misdiagnosis:

* Inspect for proper operation of the brake lamps.
* Electromagnetic interference (EMI) on the vehicle speed sensor signal circuit may cause erratic cruise control operation.

For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics

Conditions for Enabling Cruise Control

* The vehicle speed is greater than 40 km/h (25 mph).
* The vehicle is not in PARK, REVERSE, NEUTRAL, or 1st gear.
* The system voltage is within 9-16 volts.

Test Description

Step 1 - Step 10:

Step 11 - Step 21:

Step 22 - Step 29:

The numbers below refer to the step numbers on the diagnostic table.
8. This step tests the center high mount stop lamp (CHMSL) supply voltage/stop lamp supply voltage circuit for an open or for a high resistance between the stop lamp switch and the throttle actuator control (TAC) module.
9. This step tests the cruise control set/coast switch signal circuit for an open or for a high resistance.
10. This step tests the cruise control resume/accel switch signal circuit for an open or for a high resistance.
11. This step tests the ignition 3 voltage circuit for an open, for a short to ground, or for a high resistance.
29. DTCs will set in the powertrain control module (PCM) when you perform this table.