Pinpoint Test C: The Speed Control Switches Do Not Operate Correctly

Speed Control

Pinpoint Test C: The Speed Control Switches Do Not Operate Correctly

Refer to Wiring Diagram Set 31, Speed Control for schematic and connector information. Diagrams By Number

Normal Operation

The PCM sends a signal through circuit VES10 (WH) to the speed control switches, which passes through the clockspring. The return signal is sent to the PCM through circuit RES08 (GN/BN) and the clockspring.

- DTC P0579 (Cruise Control Multifunction Input A Circuit Range/Performance) - sets when the speed control switch circuits are open, shorted to voltage or ground.
- DTC P0581 (Cruise Control Multi-Function Input A Circuit High) - sets when the speed control switch circuits are open or shorted to voltage.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Clockspring
- Speed control switches
- PCM



PINPOINT TEST C: THE SPEED CONTROL SWITCHES DO NOT OPERATE CORRECTLY

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

C1-C3:

C3-C5:

C5-C8:

C8-C9:

C9-C11: