Compressor Clutch: Testing and Inspection

MAGNET CLUTCH

Description

Magnet clutch drives a compressor, by a signal of IPDM E/R.


Component Function Check


1. CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK

1.Press AUTO switch.
2.Display should indicate AUTO. Confirm that the magnet clutch engages (sound or visual inspection). (Discharge air and fan speed depend on ambient, in-vehicle and set temperatures.)
Does the magnet clutch operate?
YES- INSPECTION END
NO- Go to Diagnosis Procedure. Refer to "Diagnosis Procedure" .


Diagnosis Procedure


1. PERFORM IPDM E/R AUTO ACTIVE TEST

Perform IPDM E/R auto active test. Refer to "Diagnosis Description" Diagnosis Description.
Does the magnet clutch operate?
YES-1-WITH CONSULT: GO TO 4.
YES-2-WITHOUT CONSULT: GO TO 5.
NO- Check 10A fuse (No. 49, located in IPDM E/R), and GO TO 2.

2. CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR

1.Turn ignition switch OFF.
2.Disconnect IPDM E/R connector and compressor connector.
3.Check continuity between IPDM E/R harness connector and compressor harness connector.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair harness or connector.

3. CHECK MAGNET CLUTCH CIRCUIT

Check for operation sound when applying battery voltage direct current to terminal.
Is the inspection result normal?
YES- Replace IPDM E/R.
NO- Replace magnet clutch. Refer to "MAGNET CLUTCH : Removal and Installation of Compressor Clutch" Service and Repair.

4. CHECK CAN COMMUNICATION

Check CAN communication. Refer to "Trouble Diagnosis Flow Chart" Trouble Diagnosis Flow Chart.
- ECM - IPDM E/R
- ECM - Unified meter and A/C amp.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace malfunctioning part.

5. CHECK REFRIGERANT PRESSURE SENSOR

WITH CONSULT
1.Start the engine.
2.Check voltage of refrigerant pressure sensor in "Data monitor". Refer to "Reference Value" Pinout Values and Diagnostic Parameters.
WITHOUT CONSULT
Check voltage between ECM harness connector and ground. Refer to "Component Function Check" Refrigerant Pressure Sensor.
Is the inspection result normal?
YES-1-WITH CONSULT: GO TO 6.
YES-2-WITHOUT CONSULT: Repair harness or connector.
NO- Refer to "Diagnosis Procedure" Refrigerant Pressure Sensor.

6. CHECK ECM INPUT SIGNAL

Check A/C switch signal and blower fan motor switch signal in "Data monitor". Refer to "Reference Value" Pinout Values and Diagnostic Parameters.





Is the inspection result normal?
YES- GO TO 7.
NO- Replace unified meter and A/C amp.

7. CHECK IPDM E/R INPUT SIGNAL

Check A/C compressor request signal in "Data monitor". Refer to "Reference Value" Pinout Values and Diagnostic Parameters.
Is the inspection result normal?
YES- Replace IPDM E/R.
NO- Replace ECM.