Test C: The Speed Control Is Inoperative - No DTCs

PINPOINT TEST C: THE SPEED CONTROL IS INOPERATIVE - NO DTCS

C1-C2:

C2-C4:

C4-C6:

C6-C8:

Normal Operation
The speed control actuator receives voltage through circuit 601 (LB/PK) and is grounded through circuit 1205 (BK). The driver command input signals are activated from the speed control switches through circuit 151 (LB/BK) and 848 (DG/OG). When these inputs are received by the speed control actuator, a stepper motor is prompted to pull the throttle through a speed control cable to maintain the selected speed. When the brake pedal is lightly pushed, the stop lamp switch closes. This causes the speed control actuator to deactivate the speed control system. When the brake pedal is applied with more force, the speed control deactivator switch opens, removing battery voltage from circuit 535 (LB/RD) to the speed control actuator. When the brake pedal is applied, the speed control deactivator switch opens. This causes circuit 535 (LB/RD) to open. The speed control actuator then releases the throttle, sending the actuator into sleep mode until the speed control resume or set switch is pressed or the speed control is switched off or the ignition is turned off.

Possible Causes
- circuit 151 (LB/BK) open
- circuit 535 (LB/RD) open
- circuit 601 (LB/PK) open
- circuit 848 (DG/OG) open
- circuit 1205 (BK) open
- speed control cable
- speed control switch
- speed control actuator
- clockspring
- horn switch harness
- SJB