Pinpoint Test 3: The Speed Control Switches Do Not Operate Correctly

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PINPOINT TEST 3: THE SPEED CONTROL SWITCHES DO NOT OPERATE CORRECTLY - HYBRID

Normal Operation

Voltage is sent from the PCM to the speed control switch. When a switch is pressed, the voltage is routed through a specific resistor value for each function and the PCM grounds the reference voltage. The PCM uses this reference voltage to determine which speed control input function has been selected.

- 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.

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

Diagnostic Procedure

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

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