Test A: The Speed Control Is Inoperative

PINPOINT TEST A: THE SPEED CONTROL IS INOPERATIVE

A1-A4:

A5-A9:

A10-A12:

A12-A15:

A15-A18:

A18-A20:

A21-A24:

A24-A26:

A27-A28:

A29-A30:

A30-A32:

Normal Operation
The speed control actuator sends and receives signals to the speed control switches through circuits 151 (LB/BK) and 848 (DG/OG). Voltage to the speed control actuator is supplied through circuit 16 (RD/LG) from the smart junction box (SJB). Ground for the speed control actuator is through circuit 57 (BK).

When the brake pedal is applied, the stoplamp switch routes voltage through circuits 306 (TN/LB) and 810 (RD/LG), sending a voltage signal to the speed control actuator. When the speed control actuator receives this input, the speed control actuator goes into a stand-by mode.

The clutch pedal position switch (CPP), if equipped, is normally closed. When the clutch is applied, ground is removed from circuit 306 (TN/LB) to the speed control actuator, and the actuator goes into a stand-by mode.

The speed control deactivator switch (closed when the brake pedal is not applied) routes voltage through circuit 307 (BK/YE) to the speed control actuator. When the brake pedal is firmly pressed, the speed control deactivator switch opens and voltage is no longer supplied to the speed control actuator.

The speed control actuator receives the speed signal from the powertrain control module (PCM) through circuit 679 (GY/BK).

Possible Causes
- Fuse
- Circuit 16 (RD/LG) open
- Circuit 57 (BK) open
- Circuit 151 (LB/BK) open, short to ground or voltage
- Circuit 306 (TN/LB) open
- Circuit 307 (BK/YE) open
- Circuit 679 (GY/BK) open, short to ground or voltage
- Circuit 848 (DG/OG) open or short to voltage
- Stoplamp switch
- CPP switch
- Speed control deactivator switch
- Speed control cable
- Throttle body linkage
- Clockspring
- Speed control switch
- Speed control actuator
- SJB
- PCM