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.

WIRING DIAGRAM

A01EP4TE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


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

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

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (A/C SIGNAL)


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

      Engine
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/C Signal A/C switch signal / ON or OFF

      ON: A/C switch on

      OFF: A/C switch off

      		 -
      OK
      The display is as specified in the normal condition.

    NG

    INSPECT FUSE (A/C IG) Click here

    OK

    REPLACE ECM Click here

  3. 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

    NG

    REPLACE FUSE

    OK

  4. INSPECT MAGNETIC CLUTCH RELAY


    1. A01ENSNE04

      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 Battery voltage not applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE MAGNETIC CLUTCH RELAY

    OK

  5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)


    1. A01ERP4E04

      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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A01ERO1E02

      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

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  7. INSPECT COOLER COMPRESSOR ASSEMBLY


    1. A01ENZNE02

      Disconnect the C37 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
      C37-3 (MG+) - A-1 Always Below 1 Ω
      C37-3 (MG+) - Body ground Always 10 kΩ or higher

    NG

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    OK

  8. INSPECT MAGNETIC CLUTCH


    1. A01ERETE01

      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.


    NG

    REPLACE MAGNETIC CLUTCH

    OK

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


    1. A01ES0OE01

      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

    NG

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

    OK

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