Reading and Clearing Diagnostic Trouble Codes

WARNING: THIS TEST IS A KEY ON ENGINE OFF (KOEO) TEST THAT IS CONDUCTED ONLY IN PARK WITH THE PARKING BRAKE FULLY ENGAGED.

NOTE: On vehicles equipped with a manual transmission, the clutch pedal needs to be applied in order to correctly perform the self-test. On vehicles equipped with an automatic transmission, the transmission selector lever needs to be in the P or N position.

^ Enter self-test diagnostics by depressing the speed control OFF switch while turning the ignition key on, 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. Five additional flashes at this point indicate a defective speed control module. Release the OFF switch.
^ Press the remaining switches in this sequence: ON, RSM (resume), CST (coast) and SET/ACCEL.

NOTE: If the ON switch is not pressed within five seconds after entering diagnostic mode, the module times out and the procedure must be started over.

^ The speed control indicator lamp will flash as each switched is pressed. Press each switch in the sequence immediately after the light goes out for the previous switch.
^ A lamp flash with the last button (SET/ACCEL) indicates that the STATIC test has passed. If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective. If the lamp does not flash with the last button, and additional flashes occur, follow the list below for trouble codes:
- 2 flashes: Brake Pedal Position (BPP) switch is defective, circuit is defective or the brake pedal is applied.
- 3 flashes: Brake deactivation switch is open or circuit is defective.
- 4 flashes: Clutch/neutral switch circuit is defective, clutch switch is defective or the clutch is not applied.

NOTE: There will be a slight delay when the last button is pressed and the lamp flashes.

^ Immediately (.25 second) after the static test has passed, the speed control module will carry out a dynamic test automatically by actuating the throttle lever from 1 to 10 mm (.04 to .39 inches) of travel from the idle position. 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 the Symptom Chart. Diagnosis By Symptom