P1274

P1274-A/C CLUTCH CONTROL CIRCUIT 2 OPEN

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

- When Monitored:
With the ignition on.

Battery voltage greater than 10.4 volts.

Totally Integrated Power Module (TIPM) requesting A/C Clutch operation.

- Set Condition:
An 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. A/C CLUTCH OPERATION
1. Ignition on, engine not running.
2. With a scan tool under the PCM Actuators, actuate the A/C Clutch.

Is the A/C Clutch actuating?

Yes

- Perform the INTERMITTENT CONDITION diagnostic procedure. Intermittent Condition Test.

No

- Go To 2

2. A/C CLUTCH CONTROL OPERATION FROM THE PCM
1. Turn the ignition off.
2. Disconnect the TIPM C1 harness connector.
3. Ignition on, engine not running.
4. With the scan tool under the TPIM Actuators, actuate the A/C Clutch.
5. With a 12-volt test light connected to ground, probe the (C13) A/C Clutch Control circuit in the TIPM C1 harness connector.

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

Yes

- Go To 3

No

- Perform the diagnostic procedure for P0646-A/C CLUTCH CONTROL CIRCUIT LOW Testing and Inspection.

3. (C3) A/C CLUTCH CONTROL OUTPUT CIRCUIT OPEN
1. Turn the ignition off
2. Disconnect the TIPM C10 harness connector.
3. Disconnect the A/C Clutch harness connector.
4. Measure the resistance of the (C3) A/C Clutch Control Output circuit between the TIPM C10 harness connector and the A/C Clutch harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 4

No

- Repair the open in the (C3) A/C Clutch Control Output circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

4. A/C CLUTCH




1. Connect the TIPM C1 and C10 harness connectors.
2. Ignition on, engine not running.
3. With the scan tool under the TIPM Actuators, actuate the A/C Clutch.
4. Using 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.

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

Yes

- Replace the A/C Clutch. A/C Compressor - Removal.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

- Go To 5

5. TOTALLY INTEGRATED POWER MODULE (TIPM)

NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

1. Using the schematics as a guide, inspect the wire harness and connectors.
2. Pay particular attention to all Power and Ground circuits.

Were any problems found?

Yes

- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

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