P1275

P1275-A/C CONTROL CIRCUIT 2 OVERCURRENT

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

Theory of Operation

The Totally Integrated Power Module (TIPM) is commanded by the Powertrain Control Module (PCM) through a hardwired signal to actuate the A/C Clutch. The TIPM actuates the A/C Clutch by providing voltage through a high-side driver circuit. The TIPM monitors this circuit for correct voltage and current flow.

- When Monitored:
With the ignition on.

Battery voltage greater than 10.4 volts.

Air Conditioning (A/C) Switch on.

A/C Compressor Clutch command on.

- Set Condition:
The TIPM detects the current draw on the A/C Clutch Control Output circuit is higher than the calibrated level.





1. A/C CLUTCH OPERATION
1. Ignition on, engine not running.
2. With a scan tool, actuate the A/C Clutch.

Does the A/C Clutch actuate?

Yes

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 2

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




1. Turn the ignition off.
2. Disconnect the A/C Compressor Clutch harness connector.
3. Disconnect the TIPM C1 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 above 10k Ohms?

Yes

- Go To 3

No

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

3. CHECK THE (C3) A/C CLUTCH CONTROL OUTPUT FROM TIPM




1. Reconnect the TIPM C1 harness connector.
2. Ignition on, engine not running.
3. Using the 12-volt test light connected to ground, check the (C3) A/C Clutch Control Output circuit in the A/C Compressor Clutch harness connector.
4. With a scan tool, actuate the A/C Clutch.

Does the test light illuminate when the A/C Clutch is commanded on?

Yes

- Verify that there is good pin to terminal contact in the A/C Compressor Clutch and TIPM connectors. If OK, replace the A/C Clutch. .
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the TIPM. .
- Perform the BODY VERIFICATION TEST. Body Verification Test.