Diagnosis Procedure

MAGNET CLUTCH


Description

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




MAGNET CLUTCH


Diagnosis Procedure

1.PERFORM IPDM E/R AUTO ACTIVE TEST
Perform IPDM E/R auto active test. Refer to Diagnosis Description.
Does the magnet clutch operate?
YES-1 - WITH CONSULT-III: GO TO 4.
YES-2 - WITHOUT CONSULT-III: 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 compressor.
4.CHECK CAN COMMUNICATION
Check CAN communication. Refer to 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-III
1. Start the engine.
2. Check voltage of refrigerant pressure sensor in "Data monitor". Refer to Reference Value.
WITHOUT CONSULT-III
Check voltage between ECM harness connector and ground. Refer to Component Function Check.
Is the inspection result normal?
YES-1 - WITH CONSULT-III: GO TO 6.
YES-2 - WITHOUT CONSULT-III: Repair harness or connector.
NO - Refer to Diagnosis Procedure.
6.CHECK ECM INPUT SIGNAL
Check A/C switch signal and blower fan motor switch signal in "Data monitor". Refer to Reference Value.





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.
Is the inspection result normal?
YES - Replace IPDM E/R.
NO - Replace ECM.