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Pinpoint Test B : P0645: Notes

Refer to AUTOMATIC CLIMATE CONTROL SYSTEM for schematic and connector information.

Normal Operation and Fault Conditions 

Voltage is provided to the A/C clutch relay coil. When A/C is requested and A/C line pressures allow, a ground is provided to the A/C clutch relay coil from the PCM, energizing the A/C clutch relay.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
P0645 A/C Clutch Relay Control Circuit The DTC sets when the PCM grounds the relay control circuit and more voltage than expected is detected on the circuit. The DTC also sets when the relay control circuit is off and no voltage is detected on the circuit. The PCM expects to detect voltage coming through the relay coil to the relay control circuit when it is not grounding it.

Possible Sources 

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