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 magnet clutch assembly ON signal is sent from the MGC terminal of the air conditioning amplifier assembly. Then, the A/C COMP relay turns on to operate the magnet clutch assembly.

WIRING DIAGRAM

B001G11E22
B001I3LE02

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK VEHICLE TYPE


    1. Check the vehicle type.

      Result
      Result Proceed to
      w/o Urea SCR System A
      w/ Urea SCR System B

    B

    CHECK ENGINE ROOM NO. 1 RELAY BLOCK, JUNCTION BLOCK (A/C COMP RELAY) Click here

    A

  2. INSPECT MAGNET CLUTCH RELAY (A/C COMP)


    1. A01XCRJ

      Remove the A/C COMP relay from the engine room No. 1 relay block, junction 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 is not applied to terminals 1 and 2 10 kΩ or higher
      Battery voltage is applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE MAGNET CLUTCH RELAY (A/C COMP)

    OK

  3. INSPECT COOLER COMPRESSOR ASSEMBLY


    1. B001FMRE03

      for 1GR-FE:

      Remove the cooler compressor assembly Click here.

    2. for 1KD-FTV:

      Remove the cooler compressor assembly Click here.

    3. for 2TR-FE:

      Remove the cooler compressor assembly Click here.

    4. Disconnect the A magnet clutch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (MG+) - A-1 Always Below 1 Ω
      3 (MG+) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG (for 1GR-FE) B
      NG (for 1KD-FTV) C
      NG (for 2TR-FE) D

    B

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    C

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    D

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    A

  4. INSPECT MAGNET CLUTCH ASSEMBLY


    1. B001DYWE01

      Reconnect the A magnet clutch connector.

    2. Apply battery voltage to the magnet clutch assembly and check the operation of the magnet clutch assembly.

      OK
      Measurement Condition Specified Condition

      Battery positive (+) → Terminal 3 (MG+)

      Battery negative (-) → Body ground

      		 Magnet clutch assembly operating sound can be heard, and magnetic clutch hub and rotor lock.
      Result
      Result Proceed to
      OK A
      NG (for 1GR-FE) B
      NG (for 1KD-FTV) C
      NG (for 2TR-FE) D

    B

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    C

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    D

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    A

  5. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK, JUNCTION BLOCK - BATTERY)


    1. B001FE0E01
      Text in Illustration
      *1 A/C COMP Relay
      *a

      Component without relay installed

      (Engine Room No. 1 Relay Block, Junction Block)

      Remove the A/C COMP relay from the engine room No. 1 relay block, junction block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A/C COMP relay terminal 1 - Body ground Ignition switch ON 11 to 14 V
      A/C COMP relay terminal 5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. B001E3TE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the G25 amplifier connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G25-20 (MGC) - Body ground Ignition switch off Below 1 V
      G25-20 (MGC) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK, JUNCTION BLOCK - COOLER COMPRESSOR)


    1. Remove the A/C COMP relay from the engine room No. 1 relay block, junction block.

    2. Disconnect the C39 compressor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A/C COMP relay terminal 3 - C39-3 (MG+) Always Below 1 Ω
      C39-3 (MG+) - Body ground Always 10 kΩ or higher

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. CHECK ENGINE ROOM NO. 1 RELAY BLOCK, JUNCTION BLOCK (A/C COMP RELAY)


    1. B001F73E02

      Remove the engine room No. 1 relay block, junction block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1J-9 - 1K-1 Battery voltage is not applied to 1K-12 and 1K-13 10 kΩ or higher
      Battery voltage is applied to 1K-12 and 1K-13 Below 1 Ω

    NG

    REPLACE ENGINE ROOM NO. 1 RELAY BLOCK, JUNCTION BLOCK

    OK

  9. INSPECT COOLER COMPRESSOR ASSEMBLY


    1. B001GKBE02

      Remove the cooler compressor assembly Click here.

    2. Disconnect the A magnet clutch connector.

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

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

    NG

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    OK

  10. INSPECT MAGNET CLUTCH ASSEMBLY


    1. B001DYWE01

      Reconnect the A magnet clutch connector.

    2. Apply battery voltage to the magnet clutch assembly and check the operation of the magnet clutch assembly.

      OK
      Measurement Condition Specified Condition

      Battery positive (+) → Terminal 3 (MG+)

      Battery negative (-) → Body ground

      		 Magnet clutch assembly operating sound can be heard, and magnetic clutch hub and rotor lock.

    NG

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK, JUNCTION BLOCK - BATTERY)


    1. B001H1KE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Engine Room No. 1 Relay Block, Junction Block)

      Disconnect the 1K engine room No. 1 relay block, junction block connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1K-1 - Body ground Ignition switch ON 11 to 14 V
      1K-13 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. B001E3TE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the G25 amplifier connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G25-20 (MGC) - Body ground Ignition switch off Below 1 V
      G25-20 (MGC) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK, JUNCTION BLOCK - COOLER COMPRESSOR)


    1. Disconnect the 1J engine room No. 1 relay block, junction block connector.

    2. Disconnect the C39 cooler compressor assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1J-9 - C39-3 (MG+) Always Below 1 Ω
      C39-3 (MG+) - Body ground Always 10 kΩ or higher

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR