Powertrain Control Module (PCM)

P0647-A/C CLUTCH CONTROL CIRCUIT 2 HIGH





For a complete wiring diagram, refer to the wiring information Electrical Diagrams.

- When Monitored:
With the ignition on. Battery voltage greater than 10 volts. A/C Switch on.

- Set Condition:
A shorted high or open condition has been detected in the A/C Clutch Control output circuit by the TIPM. One Trip Fault. Three good trips to turn off the MIL.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. ACTIVE DTC
1. Start the engine.
2. Allow the engine to reach normal operating temperature.
3. Turn the A/C on.
4. With a scan tool, select View DTCs.

Is the DTC Active at this time?

Yes

- Go To 2

No

- Refer to CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. Checking for an Intermittent DTC.

2. (C3) A/C CLUTCH CONTROL OUTPUT CIRCUIT SHORTED TO VOLTAGE




1. Turn the ignition off.
2. Disconnect the C2 TIPM harness connector.
3. Disconnect the A/C Compressor Clutch harness connector.
4. Ignition on, engine not running.
5. Measure the voltage on the (C3) A/C Clutch Control Output circuit at the A/C Compressor Clutch harness connector.

Is there any voltage present?

Yes

- Repair the short to battery voltage in the (C3) A/C Clutch Control Output circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. A/C CLUTCH GROUND CIRCUIT OPEN




1. Turn the ignition off.
2. Connect the C2 TIPM harness connectors.
3. Using a 12-volt test light connected to 12-volts, probe the (Z904) A/C Clutch ground circuit at the A/C Compressor Clutch harness connector.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the excessive resistance in the (Z904) A/C Clutch ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. A/C COMPRESSOR CLUTCH




1. Ignition on, engine not running.
2. With a 12-volt test light connected to ground, probe the (C3) A/C Clutch Control Output circuit at the A/C Compressor Clutch harness connector.
3. Using the scan tool under the TIPM Actuators, actuate the A/C Clutch.

Does the test light illuminate brightly and flash on and off?

Yes

- Replace the A/C Compressor Clutch.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Inspect the A/C Clutch Control Output circuit for an open.If OK, replace the Totally Integrated Power Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.