P0647

P0647-A/C CLUTCH CONTROL CIRCUIT 2 HIGH





For a complete wiring diagram, refer to the Wiring Information.

- 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

- Perform the INTERMITTENT CONDITION diagnostic procedure. Intermittent Condition Test

2. CHECK THE (C3) A/C CLUTCH CONTROL OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition off.
2. Disconnect the TIPM C2 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. CHECK THE (Z904) A/C CLUTCH GROUND CIRCUIT FOR AN OPEN




1. Turn the ignition off.
2. Connect the TIPM C2 harness connector.
3. Using a 12-volt test light connected to 12-volts, check 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 open or excessive resistance in the (Z904) A/C Clutch Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE A/C COMPRESSOR CLUTCH FOR CORRECT OPERATION




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