Test A: The Speed Control Is Inoperative

PINPOINT TEST A: THE SPEED CONTROL IS INOPERATIVE

A1:

A2-A3:

A3-A5:

A5-A7:

A7-A9:

A9-A11:

A11-A12:

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.

Possible Causes
- circuit 151 (LB/BK) open, short to voltage, or short to ground
- circuit 848 (DG/OG) open, short to voltage, or short to ground
- clockspring
- PCM
- speed control switch