Self-Test Diagnostics

WARNING: This test is a key on engine off (KOEO) test only that is conducted in PARK (P) only with the emergency brake fully engaged.

NOTE: Review the following steps before carrying out the self-test diagnostic procedure.

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

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

Connect the scan tool to a power source that is not interrupted when the ignition switch changes positions. With the ignition switch in the RUN position, set the scan tool to monitor the powertrain control module (PCM) throttle position PID while the speed control actuator carries out the self-test.
Enter self-test diagnostics by firmly pressing and holding the speed 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 speed control indicator lamp on the instrument panel will flash once to indicate that the speed control module has entered the diagnostic mode. Release the OFF switch. If 5 additional flashes are displayed at this point, a speed control subsystem concern exists. GO to SYMPTOM CHART .

NOTE: The module times out if each button is not pressed within one second of the previous button. If a module time out occurs (speed 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/ACCEL
The speed control indicator lamp flashes once after each of the first 4 buttons is successfully pressed. Firmly press and release each switch in the sequence immediately after the light goes out for the previous switch.

NOTE: There will be a slight delay from when the last button 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 .

Follow the list below for diagnostic flash codes, then GO to SYMPTOM CHART .
- 0 flashes: No flash after the last button pressed: suspect circuitry or speed 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 speed control deactivator switch is open or the circuit is damaged.
- 4 flashes: The vehicle speed signal is out of range or circuit is damaged.
- 5 flashes: Speed control actuator internal failure.

NOTE: Monitor the PCM throttle position PID after the last button is pressed.

Within 0.25 second after the static test has passed, the speed 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 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 speed control cable, verify the correct connection of the speed control cable to the throttle lever, and make sure that the throttle returns to the idle position. If incorrect connection and/or binding or sticking of the speed control is observed, GO to SYMPTOM CHART .
Turn the key to OFF and GO to SYMPTOM CHART .