P1272

P1272-A/C CLUTCH CONTROL CIRCUIT 2 LOW



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

- Set Condition:
A shorted condition is detected in the A/C clutch control circuit. 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 CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. Checking for an Intermittent DTC.

2. A/C CLUTCH CONTROL OPERATION FROM THE PCM




1. Turn the ignition off.
2. Disconnect the C2 TIPM harness connector.
3. Ignition on, engine not running.
4. With a 12-volt test light connected to B+, probe the (C13) A/C Clutch Control circuit in the C2 TIPM harness connector.
5. Using the scan tool under the PCM Actuators, actuate the A/C Clutch.

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

Yes

- Go To 3

No

- Perform the Diagnostic Procedure for P0645-A/C CLUTCH CONTROL CIRCUIT P0645
3. (C3) A/C CLUTCH CONTROL OUTPUT CIRCUIT SHORTED TO GROUND




1. Turn the ignition off
2. Disconnect the C9 TIPM harness connector.
3. Disconnect the A/C Compressor Clutch harness connector.
4. Measure the resistance between ground and the (C3) A/C Clutch Control Output circuit at the A/C Compressor Clutch harness connector.

Is the resistance below 100 ohms?

Yes

- Repair the short to ground in the (C3) A/C Clutch Control Output circuit.
- Perform the PCM VERIFICATION TEST. PCM Verification Test.

No

- Go To 4

4. A/C COMPRESSOR CLUTCH




1. Connect the C2 and C9 TIPM harness connectors.
2. Ignition on, engine not running.
3. 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.
4. 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 PCM VERIFICATION TEST. PCM Verification Test.

No

- Go To 5

5. TOTALLY INTEGRATED POWER MODULE (TIPM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the A/C Clutch, TIPM, and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the A/C Clutch, TIPM, and Powertrain Control Module connectors.
4. Search for any Technical Service Bulletins that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the PCM VERIFICATION TEST. PCM Verification Test.

No

- Replace the Totally Integrated Power Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.