Nissan Murano: Heater & Air Conditioning Control System :: Symptom Diagnosis / Compressor Does Not Operate

Diagnosis Procedure

Symptom: A/C compressor does not operate.

NOTE:

• Perform self-diagnoses with CONSULT before performing symptom diagnosis. If DTC is detected, perform the corresponding diagnosis.

• Check that refrigerant system is properly charged. If refrigerant amount is below the proper amount, perform inspection of refrigerant leakage.

CHECK MAGNET CLUTCH OPERATION

Check magnet clutch. Refer to Component Function Check.

Does it operate normally?

GO TO 2.

Repair or replace malfunctioning parts.

CHECK REFRIGERANT PRESSURE SENSOR

Check refrigerant pressure sensor. Refer to Component Function Check.

Is the inspection result normal?

GO TO 3.

Repair or replace malfunctioning parts.

CHECK A/C AUTO AMP. OUTPUT SIGNAL

CONSULT

1. Select “COMP REQ SIG” and “FAN REQ SIG” in “Data Monitor” mode of “HVAC”.

2. Check that the function operates normally according to the following conditions:

   Monitor item	Condition		Status
   COMP REQ SIG	A/C switch	ON	On
   		OFF	Off
   FAN REQ SIG	Front blower motor	ON	On
   		OFF	Off

Is the inspection result normal?

GO TO 4.

Replace A/C auto amp. Refer to Removal and Installation.

CHECK ECM INPUT SIGNAL

CONSULT

1. Select “AIR COND SIG” and “HEATER FAN SW” in “Data Monitor” mode of “ENGINE”.

2. Check that the function operates normally according to the following conditions:

   Monitor item	Condition		Status
   AIR COND SIG	A/C switch	ON	On
   		OFF	Off
   HEATER FAN SW	Front blower motor	ON	On
   		OFF	Off

Is the inspection result normal?

GO TO 5.

Check CAN communication system. Refer to Trouble Diagnosis Flow Chart.

CHECK IPDM E/R INPUT SIGNAL

CONSULT

1. Start engine.

2. Select “AC COMP REQ” in “Data Monitor” mode of “IPDM E/R”.

3. Check that the function operates normally according to the following conditions:

   Monitor item	Condition		Status
   AC COMP REQ	A/C switch	ON	On
   		OFF	Off

Is the inspection result normal?

Inspection End.

Check CAN communication system. Refer to Trouble Diagnosis Flow Chart.