P1273-A/C CLUTCH CONTROL CIRCUIT 2 HIGH
For a complete wiring diagram, refer to the Wiring Information.
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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.
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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.
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Set Condition:
The Totally Integrated Power Module (TIPM) detects the voltage on the A/C Clutch Driver circuit is higher than the calibrated level.
Possible Causes |
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| (C3) A/C CLUTCH DRIVER CIRCUIT OPEN |
| (C3) A/C CLUTCH DRIVER CIRCUIT SHORTED TO VOLTAGE |
| (Z906) GROUND CIRCUIT OPEN OR EXCESSIVE RESISTANCE |
| A/C CLUTCH |
| TOTALLY INTEGRATED POWER MODULE (TIPM) |
| NOTE: | If Powertrain Control Module (PCM) DTC P0645-A/C CLUTCH CONTROL CIRCUIT is present, diagnose it first. |
| 1. | Ignition on, engine not running. |
| 2. | With the 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. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
No
- Go To 2
2. (C3) A/C CLUTCH DRIVER CIRCUIT SHORTED TO VOLTAGE
| 1. | Turn the ignition off. |
| 2. | Disconnect the A/C Compressor Clutch harness connector. |
| 3. | Disconnect the TIPM C1 harness connector. |
| 4. | Ignition on, engine not running. |
| 5. | Measure the voltage between ground and the (C3) A/C Clutch Driver 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 Driver circuit.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
No
- Go To 3
3. CHECK THE TIPM FOR CORRECT OPERATION
| 1. | Turn the ignition off. |
| 2. | Reconnect the TIPM C1 harness connector. |
| 3. | Ignition on, engine not running. |
| 4. | Connect a 12-volt test light between the (C3) A/C Clutch Driver circuit and (Z906) Ground circuit at the A/C Compressor Clutch harness connector. |
| 5. | With the 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 in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
No
- Go To 4
4. CHECK THE (C3) A/C CLUTCH DRIVER CIRCUIT FOR AN OPEN
| 1. | Turn the ignition off. |
| 2. | Disconnect the TIPM C1 harness connector. |
| 3. | Measure the resistance of the (C3) A/C Clutch Driver circuit between the A/C Compressor Clutch harness connector and the TIPM C1 harness connector. |
Is the resistance below 5.0 Ohms?
Yes
- Go To 5
No
- Repair the open in the (C3) A/C Clutch Driver circuit.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
5. CHECK THE (Z906) GROUND CIRCUIT FOR AN OPEN
| 1. | Using a 12-volt test light connected to 12-volts, check the (Z906) Ground circuit at the A/C Compressor Clutch harness connector. |
Does the test light illuminate brightly?
Yes
- Go To 6
No
- Repair the open or excessive resistance in the (Z906) Ground circuit.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
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 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 that may apply. |
Were there any problems found?
Yes
- Repair as necessary.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
No
- Replace the TIPM in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).