P1273

P1273-A/C CONTROL CIRCUIT 2 HIGH







- 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 Totally Integrated Power Module (TIPM) detects the voltage on the A/C Clutch Control Output circuit is higher than the calibrated level.





1. A/C CLUTCH OPERATION

NOTE: If Engine Control Module (ECM) or Powertrain Control Module (PCM) DTC P0645-A/C CLUTCH CONTROL CIRCUIT is present, diagnose it first.

1. Ignition on, engine not running.
2. With a scan tool under the TIPM Actuators, actuate the A/C Clutch.

Is the A/C Compressor Clutch actuating?

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.

No

- Go To 2

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




1. Turn the ignition off.
2. Disconnect the A/C Compressor Clutch harness connector.
3. Ignition on, engine not running.
4. 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 voltage in the (C3) A/C Clutch Control Output circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. (Z901) GROUND CIRCUIT OPEN




1. Turn the ignition off.
2. Connect the TIPM C1 harness connector.
3. Using a 12-volt test light connected to 12-volts, check the (Z901) 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 (Z901) Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. A/C COMPRESSOR CLUTCH




1. Ignition on, engine not running.
2. Using the scan tool under the TIPM Actuators, actuate the A/C Clutch.
3. 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.

Does the test light illuminate accordingly during the actuation?

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 Compressor Clutch.
- Perform the BODY VERIFICATION TEST. Body 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 Compressor Clutch and TIPM.
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 Compressor Clutch and TIPM connectors.
4. Perform any Technical Service Bulletins (TSB)s that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

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