P1275-A/C CLUTCH CONTROL CIRCUIT 2 OVERCURRENT (TIPM)





For a complete wiring diagram Refer to Section 8W.



Possible Causes
TERMINAL DAMAGE OR CORROSION
A/C CLUTCH GROUND HIGH RESISTANCE
(C3) A/C CLUTCH CONTROL OUTPUT CIRCUIT HIGH RESISTANCE
(C3) A/C CLUTCH CONTROL OUTPUT CIRCUIT SHORTED TO GROUND
A/C COMPRESSOR CLUTCH
TIPM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).



Diagnostic Test

1. A/C CLUTCH OPERATION

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

Is the A/C Clutch actuating?

Yes


No

2. VISUAL AND PHYSICAL CONNECTOR AND TERMINAL INSPECTION

Turn the ignition off.
Disconnect the C1 TIPM harness connector.
Disconnect the A/C Clutch harness connector.
Inspect the terminal and connector condition. Check for signs of corrosion build up or damage the would compromise the terminal to controller pin connector.

NOTE: Make sure that all in-line connectors are inspected for corrosion and/or damage.


Visually inspect the wiring harness. Look for any chafed, pierced, pinched or partially broken wires hidden in the wire insulation.

Were any of the above conditions found?

Yes


No

3. (C3) A/C CLUTCH CONTROL OUTPUT CIRCUIT EXCESSIVE RESISTANCE



With a jumper wire, connect one end to the (C3) A/C Clutch Control Output circuit in the A/C Clutch harness connector and the other to a clean chassis ground.
Using a 12-volt test light connected to battery voltage, probe the (C3) A/C Clutch Control Output circuit in the C1 TIPM harness connector.

NOTE: The test light should be illuminated and bright. Compared the brightness to that of a direct connection to the battery.



Does the test light illuminate brightly?

Yes


No

4. (C3) A/C CLUTCH CONTROL OUTPUT CIRCUIT SHORTED TO GROUND



Measure the resistance between ground and the (C3) A/C Clutch Control Output circuit at the A/C Clutch harness connector.

Is the resistance below 100 ohms?

Yes


No

5. A/C CLUTCH GROUND CIRCUIT



Using a 12-volt test light connected to battery voltage, probe the (Z906) A/C Clutch Ground circuit in the A/C Clutch harness connector.

NOTE: The test light should be illuminated and bright. Compared the brightness to that of a direct connection to the battery.



Does the test light illuminate brightly?

Yes


No

6. A/C CLUTCH CONTROL OUTPUT FROM TIPM



Reconnect the C1 TIPM harness connector.
Ignition on, engine not running.
With a scan tool in the TIPM Actuators, actuate the A/C Clutch.
Using the 12-volt test light connected to ground, probe the (C3) A/C Clutch Control Output circuit in the A/C Clutch harness connector.

Does the test light illuminate brightly?

Yes


No