P1275-A/C CLUTCH CONTROL CIRCUIT 2 OVERCURRENT
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 TIPM detects the current draw 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 SHORTED TO GROUND |
| A/C CLUTCH |
| TOTALLY INTEGRATED POWER MODULE (TIPM) |
| 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. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
No
- Go To 2
2. CHECK THE (C3) A/C CLUTCH DRIVER 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 Driver circuit in 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 Driver circuit.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
3. CHECK THE (C3) A/C CLUTCH DRIVER 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 Driver 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 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
- 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).