Test C: DTC P0579 or DTC P0581 - Speed Control Switch Circuit Failure

PINPOINT TEST C: DTC P0579 OR DTC P0581 - SPEED CONTROL SWITCH CIRCUIT FAILURE

C1-C2:

C3-C5:

C5-C6:

C7-C9:

C9-C10:

Normal Operation
The powertrain control module (PCM) sends a signal through circuit 248 (TN/OG) to the speed control switches which passes through the clockspring. The return signal is sent through circuit 133 (BK) and the clockspring.

Possible Causes
- circuit 248 (TN/OG) open, short to voltage, or short to ground
- circuit 133 (BK) open or short to voltage
- clockspring
- speed control switch
- PCM