AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION

When the air conditioning amplifier assembly is turned on, a magnetic clutch on signal is sent from the MGC terminal of the air conditioning amplifier assembly. Then, the magnetic clutch relay turns on to operate the magnetic clutch.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Check for CAN communication system DTCs related to the air conditioning system.

      Table 1. Result

      Result	Proceed to
      CAN DTC is not output	A
      CAN DTC is output (for LHD)	B
      CAN DTC is output (for RHD)	C

   
   
   • AClick here
   • BClick here
   • CClick here
2. Click here

   READ VALUE USING INTELLIGENT TESTER (A/C SIGNAL)

   
   

   1. Use the Data List to check if the A/C switch is functioning properly.

      Table 2. Engine

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      A/C Signal	A/C signal / ON or OFF	ON: A/C switch on OFF: A/C switch off	-

      OK
      The display is as specified in the normal condition.

   
   
   • OKClick here
   • NGClick here
3. Click here

   INSPECT FUSE (A/C IG)

   
   

   1. Remove the A/C IG fuse from the cowl side junction block LH.

   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition A/C IG fuse Always Below 1 Ω

   
   
   • OKClick here
   • NGClick here
4. Click here

   INSPECT MAGNETIC CLUTCH RELAY

   
   
   1. 

      Remove the magnetic clutch relay from the engine room relay block.

   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition 3 - 5 Voltage not applied to terminals 1 and 2 10 kΩ or higher 3 - 5 Voltage applied to terminals 1 and 2 Below 1 Ω

   3. Install the magnetic clutch relay to the engine room relay block.

   
   
   • OKClick here
   • NGClick here
5. Click here

   CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)

   
   
   1. 

      w/ Rear Heater

      
      

      1. Disconnect the E36 amplifier connector.

      2. Measure the voltage according to the value(s) in the table below.

         Standard Voltage
         Tester Connection Switch Condition Specified Condition E36-18 (MGC) - Body ground Engine switch off Below 1 V E36-18 (MGC) - Body ground Engine switch on (IG) 11 to 14 V

   2. 

      w/o Rear Heater

      
      

      1. Disconnect the E81 amplifier connector.

      2. Measure the voltage according to the value(s) in the table below.

         Standard Voltage
         Tester Connection Switch Condition Specified Condition E81-20 (MGC) - Body ground Engine switch off Below 1 V E81-20 (MGC) - Body ground Engine switch on (IG) 11 to 14 V

   
   
   • OKClick here
   • NGClick here
6. Click here

   INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

   
   
   1. 

      w/ Rear Heater

      
      

      1. Reconnect the E36 amplifier connector.

      2. Measure the voltage according to the value(s) in the table below.

         Standard Voltage
         Tester Connection Switch Condition Specified Condition E36-18 (MGC) - Body ground Engine switch on (IG) A/C switch off 11 to 14 V E36-18 (MGC) - Body ground Engine switch on (IG) A/C switch on Below 1 V

   2. 

      w/o Rear Heater

      
      

      1. Reconnect the E81 amplifier connector.

      2. Measure the voltage according to the value(s) in the table below.

         Standard Voltage
         Tester Connection Switch Condition Specified Condition E81-20 (MGC) - Body ground Engine switch on (IG) A/C switch off 11 to 14 V E81-20 (MGC) - Body ground Engine switch on (IG) A/C switch on Below 1 V

   
   
   • OKClick here
   • NGClick here
7. Click here

   INSPECT COOLER COMPRESSOR ASSEMBLY

   
   
   1. 

      Disconnect the C30 compressor connector.

   2. Disconnect the A magnetic clutch connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition C30-3 (MG+) - A-1 Always Below 1 Ω C30-3 (MG+) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
8. Click here

   INSPECT MAGNETIC CLUTCH

   
   
   1. 

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition A-1 - Body ground 20°C (68°F) 3.4 to 3.8 Ω

   2. When connector terminal A-1 is connected to the positive (+) battery terminal, check that the following occurs: 1) the operating sound of the magnetic clutch can be heard, and 2) the hub and rotor of the magnetic clutch lock.

   
   
   • OKClick here
   • NGClick here
9. Click here

   CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - BATTERY)

   
   
   1. 

      Remove the magnetic clutch relay from the engine room relay block.

   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition Relay block magnetic clutch relay terminal 5 - Body ground Engine switch on (IG) 11 to 14 V Relay block magnetic clutch relay terminal 1 - Body ground Engine switch on (IG) 11 to 14 V

   
   
   • OKClick here
   • NGClick here
10. Click here

    GO TO CAN COMMUNICATION SYSTEMClick here

11. Click here

    REPLACE ECMClick here

12. Click here

    REPLACE FUSE (A/C IG)

13. Click here

    REPLACE MAGNETIC CLUTCH RELAY

14. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

15. Click here

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

16. Click here

    REPLACE COOLER COMPRESSOR ASSEMBLYClick here

17. Click here

    REPLACE MAGNETIC CLUTCH

18. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM RELAY BLOCK - BATTERY)

19. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM RELAY BLOCK - COOLER COMPRESSOR)

20. Click here

    GO TO CAN COMMUNICATION SYSTEMClick here