Test A: The Speed Control Is Inoperative

PINPOINT TEST A: THE SPEED CONTROL IS INOPERATIVE

A1-A2:

A2-A7:

Normal Operation
The powertrain control module (PCM) sends a signal through circuit 151 (LB/BK) to the speed control switches which passes through the clockspring. The return signal is sent through circuit 848 (DG/OG) and the clockspring. The stoplamp switch sends a voltage signal through circuit 810 (RD/LG) to the PCM when the brake pedal is applied, and deactivates the speed control if engaged. The speed control deactivator switch interrupts the power signal to the PCM through circuit 307 (BK/YE) when the brake pedal is applied firmly and passes the stoplamp switch trip point. This is a redundant signal to the PCM.

Possible Causes
- Speed control switches
- Digital transmission range (TR) sensor
- PCM