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DRIVEABILITY - DIESEL
Symptom:
*A/C INOPERATIVE
CHECK FOR ECM DTCS
FUSED B+ CIRCUIT OPEN
A/C CLUTCH RELAY
A/C CLUTCH RELAY OUTPUT CIRCUIT SHORTED TO GROUND
A/C CLUTCH RELAY OUTPUT CIRCUIT OPEN
A/C CLUTCH GROUND CIRCUIT OPEN
A/C CLUTCH
ECM - INTERNAL FAULT
AZC MODULE OR A/C - HEATER CONTROL MODULE
BCM - NO SWITCH STATE CHANGE
A/C SWITCH SIGNAL CIRCUIT OPEN
BCM - ON/OFF CONTROL CIRCUIT OPEN
TEST
1
NOTE: Ensure that the refrigerant system is properly charged. Refer to the
appropriate Service Information.
With the DRBIII , check for ECM DTCs.
Are any DTCs present?
Yes → Return to the symptom list and choose the symptom(s).
→ Go To 2
No
2
Turn the ignition on.
Position the Mode switch on the AZC Module or the A/C - Heater Control Module to
the Panel position.
Turn the A/C Select switch off.
With the DRBIII in BCM, select Inputs/Outputs.
Monitor the A/C Select Switch state while turning the A/C Select switch from off to
on and then back to off.
Does the switch state change from Off to On and then back to Off?
Yes → Go To 3
→ Go To 10
No
3
Turn the ignition on.
With the DRBIII , actuate the A/C Compressor Clutch Relay.
Observe the A/C Compressor Clutch during actuation.
Is the A/C Compressor Clutch clicking?
Yes → Replace and program the ECM in accordance with the Service
→ Go To 4
No
POSSIBLE CAUSES
ACTION
Perform ROAD TEST VERIFICATION - VER-2.
Information.
Perform ROAD TEST VERIFICATION - VER-2.
212
APPLICABILITY
All
All
All
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