DaimlerChrysler Jeep Grand Cherokee 2002, Service Manual

Page: 220 / 284

Symptom:
*A/C INOPERATIVE
POSSIBLE CAUSES
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 ACTION APPLICABILITY
1 NOTE: Ensure that the refrigerant system is properly charged. Refer to the
appropriate Service Information.
With the DRBIII
t
, check for ECM DTCs.
Are any DTCs present?
All
Yes
→
Return to the symptom list and choose the symptom(s).
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Go To 2
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
t
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?
All
Yes
→
Go To 3
No
→
Go To 10
3 Turn the ignition on.
With the DRBIII
t
, actuate the A/C Compressor Clutch Relay.
Observe the A/C Compressor Clutch during actuation.
Is the A/C Compressor Clutch clicking?
All
Yes
→
Replace and program the ECM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Go To 4
212
DRIVEABILITY - DIESEL
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