P1273
P1273-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. The A/C Switch on.
- Set Condition:
A shorted high condition has been detected in the A/C Clutch Control output circuit by the Totally Integrated Power Module (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
NOTE: Diagnose and repair P0645 A/C CLUTCH CONTROL CONTROL CIRCUIT OPEN before continuing.
1. Ignition on, engine not running.
2. With the scan tool 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 C3 PCM harness connector.
CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 along with the Adapter 8815-1 to perform the diagnosis.
3. Ignition on, engine not running.
4. With the scan tool actuate the A/C Clutch.
5. Measure the voltage between the appropriate terminal of the PCM Pinout Box 8815 and ground.
Is the voltage below 1 volt?
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 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 POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.
No
- Go To 4
4. A/C CLUTCH GROUND CIRCUIT OPEN
1. Turn the ignition off.
2. Connect the C1 TIPM harness connector.
3. Using a 12-volt test light connected to 12 Volts, probe the (Z904) A/C Clutch ground circuit at the A/C Compressor Clutch harness connector.
NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes
- Go To 5
No
- Repair the excessive resistance in the (Z904) A/C Clutch ground circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.
5. A/C COMPRESSOR CLUTCH
1. Ignition on, engine not running.
2. Using the scan tool actuate the A/C Clutch.
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.
NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
Does the test light illuminate accordingly during the actuation?
Yes
- Verify that there is good pin to terminal contact in the A/C Clutch, TIPM and Powertrain Control Module connectors. If OK, replace the A/C Compressor Clutch.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.
No
- Go To 6
6. 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. Perform any Technical Service Bulletins (TSBs) that may apply.
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.