Diagnosis Procedure
Symptom: Compressor does not operate.
- 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?
YES
GO TO 2.
NO
Repair or replace malfunctioning parts.
- CHECK REFRIGERANT PRESSURE SENSOR
Check refrigerant pressure sensor. Refer to Component Function Check (VQ35DD) .
Is the inspection result normal?
YES
GO TO 3.
NO
Repair or replace malfunctioning parts.
- CHECK A/C AUTO AMP. OUTPUT SIGNAL
With CONSULT
Check "COMP REQ SIG" and "FAN REQ SIG" in "DATA MONITOR" mode of "HVAC" using CONSULT.
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?
YES
GO TO 4.
NO
Replace A/C auto amp. Refer to Removal and Installation .
- CHECK ECM INPUT SIGNAL
Check "AIR COND SIG" and "HEATER FAN SW" in "DATA MONITOR" mode of "ECM" using CONSULT.
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?
YES
GO TO 5.
NO
Check CAN communication system. Refer to Trouble Diagnosis Flow Chart .
- CHECK IPDM E/R INPUT SIGNAL
- Start engine.
- Check "AC COMP REQ" in "DATA MONITOR" mode of "IPDM E/R" using CONSULT.
Monitor item
Condition
Status
AC COMP REQ
A/C switch
ON
On
OFF
Off
Is the inspection result normal?
YES
Inspection End.
NO
Check CAN communication system. Refer to Trouble Diagnosis Flow Chart .