Diagnostic Procedure For Magnet Clutch

SYMPTOM: Magnet clutch does not engage when A/C switch is ON.

Fig 1: Identifying Magnet Clutch Circuit Diagram

1. CHECK INTAKE AND AMBIENT SENSOR CIRCUITS 

   Check intake and ambient sensors. Refer to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION ".

   OK or NG 

   OK: GO TO 2.

   NG: Malfunctioning intake sensor. Refer to "INTAKE SENSOR CIRCUIT ".

2. PERFORM AUTO ACTIVE TEST 

   Refer to "AUTO ACTIVE TEST ".

   Does magnet clutch operate?

   Yes or No 

   YES:

   • WITH CONSULT-II

     GO TO  5.

   • WITHOUT CONSULT-II

     GO TO  6.

   NO: Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 3.

3. CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR 
   1. Turn ignition switch OFF.
   2. Disconnect IPDM E/R connector and compressor (magnet clutch) connector.
   3. Check continuity between IPDM E/R harness connector E119 terminal 11 and compressor harness connector F3 terminal 1.

      11 - 1 : Continuity should exist. 

   OK or NG 

   OK: GO TO 4.

   NG: Repair harness or connector.

   Fig 2: Checking Continuity Between IPDM E/R Harness Connector E119 Terminal 11 And Harness Connector F3 Terminal 1

   
4. CHECK MAGNET CLUTCH CIRCUIT 

   Check for operation sound when applying battery voltage direct current to terminal.

   OK or NG 

   OK: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION OF IPDM E/R ".

   NG: Replace magnet clutch. Refer to "REMOVAL AND INSTALLATION FOR COMPRESSOR CLUTCH ".

   Fig 3: Checking Magnet Clutch Circuit

   
5. CHECK BCM INPUT (COMPRESSOR ON) SIGNAL 

   Check compressor ON/OFF signal. Refer to "CONSULT-II FUNCTION (BCM) ".

   A/C SW ON : COMP ON SIG ON 

   A/C SW OFF : COMP ON SIG OFF 

   OK or NG 

   OK: GO TO  8.

   NG: GO TO 6.

   Fig 4: Identifying CONSULT-II Display Data Monitor

   
6. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL 
   1. Turn ignition switch OFF.
   2. Disconnect BCM connector and front air control connector.
   3. Check continuity between BCM harness connector M18 terminal 27 and front air control harness connector M49 terminal 10.

      27 - 10 Continuity should exist. 

   OK or NG 

   OK: GO TO 7.

   NG: Repair harness or connector.

   Fig 5: Checking Continuity Between BCM Connector M18 Terminal 27 And Front Air Control Connector M49 Terminal 10

   
7. CHECK VOLTAGE FOR FRONT AIR CONTROL (COMPRESSOR ON SIGNAL) 
   1. Reconnect BCM connector and front air control connector.
   2. Turn ignition switch ON.
   3. Check voltage between front air control harness connector M49 terminal 10 and ground.
      VOLTAGE CONDITION CHART
      
      

      Terminals			Condition	Voltage (Approx.)
      (+)		(-)
      Front air control connector	Terminal No.
      M49	10	Ground	A/C switch: ON	0V
      			A/C switch: OFF	5V

      Fig 6: Checking Voltage Between Front Air Control Connector M49 Terminal 10 And Ground

      

   OK or NG 

   OK: GO TO 8.

   NG-1: If the voltage is approx. 5V when A/C switch is ON, replace front air control. Refer to "FRONT AIR CONTROL ".

   NG-2: If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to "REMOVAL AND INSTALLATION ".

8. CHECK REFRIGERANT PRESSURE SENSOR 

   WITH CONSULT-II

   1. Start engine.
   2. Check voltage of refrigerant pressure sensor. Refer to "CONSULT-II FUNCTION (BCM) ".

   WITHOUT CONSULT-II

   1. Start engine.
   2. Check voltage between ECM harness connector F54 terminal 70 and ground.
      VOLTAGE CONDITION CHART
      
      

      Terminals			Condition	Voltage (Approx.)
      (+)		(-)
      ECM connector	Terminal No.
      F54	70	Ground	A/C switch: ON	0.36 - 3.88V

      Fig 7: Checking Voltage Between ECM Connector F54 Terminal 70 And Ground

      

   OK or NG

   OK:

   • WITH CONSULT-II

     GO TO 9.

   • WITHOUT CONSULT-II

     GO TO  10.

   NG: Refer to "REFRIGERANT PRESSURE SENSOR ".

9. CHECK BCM INPUT (FAN ON) SIGNAL 

   Check FAN ON/OFF signal. Refer to "CONSULT-II FUNCTION (BCM) ".

   FRONT BLOWER CONTROL DIAL ON : FAN ON SIG ON 

   FRONT BLOWER CONTROL DIAL OFF : FAN ON SIG OFF 

   OK or NG 

   OK: GO TO  12.

   NG: GO TO 10.

   Fig 8: Identifying CONSULT-II Display Data Monitor

   
10. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL 
    1. Turn ignition switch OFF.
    2. Disconnect BCM connector and front air control connector.
    3. Check continuity between BCM harness connector M18 terminal 28 and front air control harness connector M50 terminal 35.

       28 - 35 Continuity should exist. 

    OK or NG 

    OK: GO TO 11.

    NG: Repair harness or connector.

    Fig 9: Checking Continuity Between Harness Connector M18 Terminal 28 And Harness Connector M50 Terminal 35

    
11. CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL) 
    1. Reconnect BCM connector and front air control connector.
    2. Turn ignition switch ON.
    3. Check voltage between front air control harness connector M50 terminal 35 and ground.
       VOLTAGE CONDITION CHART
       
       

       Terminals			Condition	Voltage (Approx.)
       (+)		(-)
       Front air control connector	Terminal No.
       M50	35	Ground	A/C switch: ON Blower motor operates	0V
       			A/C switch: OFF	5V

       Fig 10: Checking Voltage Between Front Air Control Harness Connector M50 Terminal 35 And Ground

       

    OK or NG 

    OK: GO TO 12.

    NG-1: If the voltage is approx. 5V when blower motor is ON, replace front air control. Refer to "FRONT AIR CONTROL ".

    NG-2: If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to "REMOVAL AND INSTALLATION ".

12. CHECK CAN COMMUNICATION 

    Check CAN communication. Refer to "SYSTEM DESCRIPTION ".

    • BCM - ECM
    • ECM - IPDM E/R
    • ECM - Front air control

    OK or NG 

    OK: Inspection End.

    NG: Repair or replace malfunctioning part(s).