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:

C2-C4:

C4-C6:

C6-C8:

C8-C9:

Normal Operation
The powertrain control module (PCM) sends a signal through circuit 7-PG24 (YE/BU) to the speed control switch, which passes through the clockspring. The return signal is sent through circuit 31S-PG24 (BK/OG)/31S-PG1 (BK/BU) and the clockspring.

Possible Causes
- Circuit 7-PG24 (YE/BU) open, short to voltage, or short to ground
- Circuit 31S-PG1 (BK/BU) open, short to voltage, or short to ground
- Circuit 31S-PG24 (BK/OG) open, short to voltage, or short to ground
- Clockspring
- PCM
- Speed control switch