Diagnosis Procedure

MAGNET CLUTCH


Diagnosis Procedure

Regarding Wiring Diagram information, refer to Coupe or Sedan.

DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH





SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
1.CHECK MAGNETIC CLUTCH WITH AUTO ACTIVE TEST
1. Perform auto active test. Refer to Diagnosis Description.
2. Check that the A/C compressor clutch operates.
Does the A/C compressor clutch operate?
YES - GO TO 2
NO - GO TO 3
2.DATA MONITOR
1. Press ignition switch ON.
2. With CONSULT-III, select "ENGINE", then "DATA MONITOR" mode.
3. Select "AIR COND SIG" and monitor while pressing A/C switch ON and OFF.





Is the inspection result normal?
YES - Check refrigerant pressure sensor. Refer to For California (QR25DE for California) or Except For California (QR25DE except for California) or Diagnosis Procedure (VQ35DE).
NO - GO TO 6
3.CHECK POWER SUPPLY FOR A/C COMPRESSOR





1. Disconnect A/C compressor connector.
2. Start engine and press A/C switch.
3. Check voltage between A/C compressor harness connector F3 terminal 1 and ground.





Is the inspection result normal?
YES - Check magnet clutch coil.
1. If NG, replace magnet clutch. Refer to Service and Repair.
2. If OK, check A/C compressor ground circuit and repair as necessary.
NO - GO TO 4
4.CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY IN IPDM E/R AND A/C COMPRESSOR





1. Disconnect IPDM E/R connector F10.
2. Check continuity between A/C compressor harness connector
F3 (A) terminal 1 and IPDM E/R harness connector F10 (B) terminal 48.





If OK, check harness for short to ground.
Is the inspection result normal?
YES - GO TO 5
NO - Repair harness or connector.
5.CHECK FUSE IN IPDM E/R
Check 10A fuse (No. 41 located in the IPDM E/R).
Is the inspection result normal?
YES - Replace IPDM E/R. Refer to Service and Repair.
NO - Replace fuse and check IPDM E/R for short circuit. Replace if necessary.
6.CHECK A/C COMPRESSOR ON SIGNAL
Check voltage between front air control connector M37 terminal 10 and ground, with A/C compressor ON and with A/C compressor OFF.










Is the inspection result normal?
YES - GO TO 8
NO - GO TO 7
7.CHECK CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL
1. Disconnect BCM connector M18 and front air control connector.
2. Check continuity between BCM harness connector M18 terminal 33 and front air control connector M37 terminal 10.





Is the inspection result normal?
YES - Replace BCM. Refer to BCM.
NO - Repair harness or connector.
8.CHECK CAN COMMUNICATION CIRCUITS
Check CAN communication circuits between BCM to ECM and between ECM to IPDM E/R. Refer to Scan Tool Testing and Procedures.
Is the inspection result normal?
YES - BCM malfunctioning.
NO - Repair or replace component based on the result of diagnosis.