Self-Test Diagnostics

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

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

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

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 1 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.

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 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 .
Firmly press and release the remaining switches within 1 second of each other in the following sequence:
- ON
- RESUME
- CST - (coast)
- SET +
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 defective, the circuit is defective or the brake pedal is applied.
- 3 flashes: The speed control deactivator switch is open or the circuit is defective.
- 4 flashes: The clutch pedal position (CPP)/neutral switch (transmission range [TR] sensor), the circuit is defective, the clutch switch is defective or the clutch is not applied.
- 5 flashes: Speed control actuator internal failure.

NOTE: Monitor the PCM throttle position (TP) 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 in.) of travel from the idle position for 3 seconds and then releasing the throttle. If the PID value does not change and hold steady for 3 seconds from the base voltage, 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 ignition switch to the OFF position and Go to Symptom Chart .