Inspection and Verification

Cruise Control

Inspection and Verification

NOTE: If any concerns are noted with the speedometer, stoplamps or horn, address those concerns by referring to the appropriate systems before continuing cruise control diagnosis.

1. Verify the customer concern.

2. Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart





3. If the fault is not visually evident, verify the symptom and refer to the self-test diagnostics.

Self-Test Diagnostics

WARNING: This KOEO (key on, engine off) test must be conducted with the vehicle stationary and the parking brake fully engaged. Failure to follow these instructions may result in serious personal injury.

NOTE: On vehicles equipped with a manual transmission, the clutch pedal needs to be applied in order to correctly carry out the self-test. On vehicles equipped with an automatic transmission, the transmission selector needs to be in the NEUTRAL (N) position.

NOTE: After entering the diagnostic mode, the module times out if the mandatory switch sequence is not completed within 5 seconds and each switch is not pressed within one second of the previous switch. If a module time-out occurs (cruise control lamp stops flashing part way through the test), the procedure must be re-initiated.

NOTE: Review and familiarize yourself with the following steps before carrying out the self-test diagnostics procedures as timing of some actions is critical.

The self-test is comprised of 2 parts. The first part is a static check of the cruise control electronics module and system. The second part is a dynamic pull-test to check the actuator motor and gear mechanism. To carry out the self-test:

- Enter self-test diagnostics by firmly pressing and holding the cruise control OFF switch while quickly cycling the ignition switch from RUN-to-OFF-to-RUN, making sure the engine does not start and is not running. The cruise control indicator lamp on the instrument panel flashes once to indicate that the cruise control module has entered the diagnostic mode. Release the OFF switch. If 5 additional flashes are displayed at this point, a cruise control subsystem concern exists. GO to Symptom Chart. Symptom Related Diagnostic Procedures

- NOTE: The module times out if each switch is not pressed within one second of the previous switch. If a module time out occurs (cruise control lamp stops flashing part way through test), the procedure must be re-initiated.

Firmly press and release the remaining switches within one second of each other in the following sequence:
- ON
- RSM (resume)
- CST- (coast)
- SET+

- The cruise control indicator lamp flashes once after each of the first 4 switches are successfully pressed. Firmly press and release each switch in the sequence immediately after the light goes out for the previous switch.
- NOTE: There is a slight delay from when the last switch is pressed and the lamp flashes diagnostic codes. If the self-test will not start or cannot be completed after multiple attempts, GO to Symptom Chart. Symptom Related Diagnostic Procedures

Follow the list below for diagnostic flash codes, then GO to Symptom Chart. Symptom Related Diagnostic Procedures
- 0 flashes: No flash after the last switch is pressed: suspect circuitry or cruise control switch.
- 1 flash: Static test passed.
- 2 flashes: The stoplamp switch is damaged, circuit is damaged, or brake pedal is applied; CPP switch is damaged, circuit is damaged, or clutch pedal is applied.
- 3 flashes: The cruise control deactivator switch is open or the circuit is damaged.
- 4 flashes: The vehicle cruise signal is out of range or the circuit is damaged.
- 5 flashes: Cruise control actuator internal failure.

- NOTE: Monitor the PCM Throttle Position (TP) PID (TP) after the last switch is pressed.

Within 0.25 second after the static test has passed, the cruise control actuator carries out a dynamic pull test automatically by actuating the throttle lever from 1 to 10 mm (0.04 to 0.39 inches) of travel from the idle position for 3 seconds and then releasing the throttle. If the TP PID value does not change and holds steady for 3 seconds, GO to Symptom Chart. During the dynamic throttle pull, observe throttle movement to witness any binding or sticking of the cruise control cable, verify the correct connection of the cruise control cable to the throttle lever, and make sure that the throttle returns to the idle position. Symptom Related Diagnostic Procedures
If incorrect connection and/or binding or sticking of the cruise control is observed, GO to Symptom Chart. Symptom Related Diagnostic Procedures
- Turn the key to OFF and GO to Symptom Chart. Symptom Related Diagnostic Procedures