Diagnostic Test
- CHECK FOR ACTIVE CAN DTCS
- CHECK FOR STORED CAN DTCS
- Turn the ignition on.
- With the scan tool, read DTCs.
Are any inactive or stored CAN DTCs set?
Yes
- Refer to STORED LOST COMMUNICATION DTCS and perform the Stored Lost Communication DTCs diagnostic procedure.
No
- Go To 3
- CHECK FOR PCM A/C COMPRESSOR DTCS
- Turn the ignition on.
- With the scan tool, read PCM DTCs and record on the repair order.
Are any PCM A/C Compressor DTCs set?
Yes
- Refer to DTC INDEX and perform the appropriate diagnostic procedure.
- Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
No
- Go To 4
- CHECK THE A/C COMPRESSOR
- Start the Engine.
- Using the A/C heater Control, request A/C maximum cool.
Does the A/C Compressor Clutch engage?
Yes
- Go To 5
No
- Diagnose and repair the A/C Compressor in accordance with the Service Information. Refer to COMPRESSOR, A/C, DIAGNOSIS AND TESTING .
- CHECK IF THE DTC RESETS
- Turn the ignition off.
- Turn the ignition on.
- With the scan tool, erase DTCs.
- Turn the ignition off.
- Turn the ignition on.
- With the scan tool, perform the A/C Cooldown Test. Follow the instructions on the scan tool.
- With the scan tool, read HVAC DTCs.
Does this DTC reset?
Yes
- Replace the HVAC Module in accordance with the Service Information. Refer to MODULE, HVAC, REMOVAL .
- Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
No
- Go To 6
- CHECK THE WIRING AND CONNECTORS
- The conditions necessary to set the DTC are not present at this time.
- With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.
- 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.
- Wiggle the wiring and connectors while checking for shorted and open circuits.
Were any problems found?
Yes
- Repair as necessary.
- Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
No
- Test complete.