A/C Clutch Control Circuit 2 Overcurrent

P1275 - A/C Clutch Control Circuit 2 Overcurrent






For a complete wiring diagram, refer to.

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 Driver circuit is higher than the calibrated level.






Test Step 1 - A/C CLUTCH OPERATION

• Ignition on, engine not running.

• 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 => Non-DTC Based Diagnostics. Body Interior

No

• Go to Test Step 2

Test Step 2 - CHECK THE (C3) A/C CLUTCH DRIVER CIRCUIT FOR A SHORT TO GROUND







• Turn the ignition off.

• Disconnect the A/C Compressor Clutch harness connector.

• Disconnect the TIPM C1 harness connector.

• 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 Test Step 3

No

• Repair the short to ground in the (C3) A/C Clutch Driver circuit.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

Test Step 3 - CHECK THE (C3) A/C CLUTCH DRIVER FROM TIPM







• Reconnect the TIPM C1 harness connector.

• Ignition on, engine not running.

• 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.

• 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. Refer to => Non-DTC Based Diagnostics. Body Interior

No

• Replace the TIPM.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior