Reading and Clearing Diagnostic Trouble Codes

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

1. Enter Self-Test Diagnostics by depressing the speed control OFF switch while turning the ignition key to ON, ensuring engine DOES NOT start and is not running. The speed control indicator lamp on the instrument panel will flash ONCE to indicate that speed control module entered the diagnostic mode. Release the OFF switch.
2. Press the remaining switches in this sequence: ON, RESUME (RSM), COAST (CST), and SET/ACCEL.

NOTE: If the ON switch is not pressed within 5 seconds after entering diagnostics mode, the module times out and the procedure must be started over.

3. The speed control indicator lamp will flash as each switch is pressed. Press each switch in the sequence immediately after the light goes out for the previous switch.
4. After all five speed control switches complete the sequence, the indicator lamp will flash to indicate a Pass or Fail:
a. 1 Flash - Test passed.
b. 2 Flashes - BOO SWITCH defective, circuit defective, or Brake Pedal applied.
c. 3 Flashes - BRAKE DEACTIVATION SWITCH is open or circuit defective.
d. 4 Flashes - SPEED SENSOR is out of range or not connected.
e. 5 Flashes - SPEED CONTROL SERVO is defective.
5. Immediately after a passed STATIC test, the speed control module then performs a DYNAMIC test automatically by actuating the throttle lever from 1 mm to 10 mm of travel from the idle position. During this DYNAMIC throttle pull, observe throttle movement to witness any binding or sticking of actuator cable, proper connection of actuator cable to throttle lever, and ensure THROTTLE RETURNS BACK TO IDLE POSITION. If improper connection and/or binding or sticking of actuator is observed, go to the Pinpoint Tests. Pinpoint Tests
6. Return Ignition Switch to OFF position and go to the Pinpoint Tests, if necessary. Pinpoint Tests