Pinpoint Test B : P0645:00: 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 |
|---|---|---|
| P0645:00 | A/C Clutch Relay Control Circuit: No Sub Type Information | The DTC sets when the PCM grounds the relay circuit and more current than expected is detected on the relay circuit. The DTC also sets when the relay circuit is off and no voltage is detected on the relay circuit. |
Possible Sources
- Wiring, terminals or connectors
- A/C clutch relay
- PCM
Visual Inspection and Diagnostic Pre-checks
- Inspect BJB fuse 70 (10A).
- Inspect the PCM wiring, terminals or connectors.
- Inspect for loose or corroded PCM connections.
- Inspect the A/C clutch relay.