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

DESCRIPTION

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

WIRING DIAGRAM

A011840E01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Select "Communication Bus Check"

      OK
      All ECUs and sensors connected to the CAN communication system are displayed.

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (MAGNETIC CLUTCH RELAY)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Air Conditioner / Active Test.

    5. According to the display on the intelligent tester, read the Data List.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Magnetic Clutch Relay

      Magnetic clutch relay

      ON or OFF

      		 OFF, ON -
      OK
      The magnetic clutch operates normally.

    NG

    INSPECT INTEGRATION NO.1 RELAY (MAGNETIC CLUTCH RELAY) Click here

    OK

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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Powertrain / Engine / Data List.

    5. According to the display on the intelligent tester, read the Data List.

      Engine
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/C Signal

      A/C switch signal /

      ON or OFF

      ON: A/C on

      OFF: A/C off

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

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

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

  4. INSPECT INTEGRATION NO.1 RELAY (MAGNETIC CLUTCH RELAY)

    A0118JAE01
    Text in Illustration
    *1

    Component without harness connected

    (Integration Relay)

    1. Remove the integration 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

      1D-6 - 1F-9*1

      1D-6 - 1F-3*2

      		 When battery voltage is not applied between terminals 10 kΩ or higher
      When battery voltage is applied to terminals 1D-6 and 1D-1*1, 1D-4*2 Below 1 Ω

      • *1: for 1KR-FE

      • *2: for 1ND-TV

    3. Reinstall the integration relay.


    NG

    REPLACE INTEGRATION NO.1 RELAY (MAGNETIC CLUTCH RELAY)

    OK

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

    A011ABQE14
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to Air Conditioning Amplifier)

    1. Disconnect the D15 air conditioning amplifier connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D15-20 (MGC) - Body ground Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V

    3. Reconnect the air conditioning amplifier connector.


    NG

    CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - BATTERY) Click here

    OK

  6. INSPECT AIR CONDITIONING AMPLIFIER (MGC VOLTAGE)

    A01170AE13
    Text in Illustration
    *1

    Component with harness connected

    (Air Conditioning Amplifier)

    1. Remove the air conditioning amplifier with its connectors still connected Click here.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D15-20 (MGC) - Body ground Engine running and A/C switch on Below 1 V
      Engine running and A/C switch off 11 to 14 V

    3. Reinstall the air conditioning amplifier.


    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

  7. INSPECT AIR CONDITIONING COMPRESSOR (COMPRESSOR HARNESS)

    A011991E01
    Text in Illustration
    *1

    Component without harness connected

    (Air Conditioning Compressor)
    *2

    Component without harness connected

    (Magnetic Clutch)

    1. Disconnect the D39 air conditioning compressor connector.

    2. Disconnect the magnetic clutch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (MG+) - 1 Always Below 1 Ω
      3 (MG+) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG (for 1KR-FE) B
      NG (for 1ND-TV) C

    B

    REPLACE AIR CONDITIONING COMPRESSOR Click here

    C

    REPLACE AIR CONDITIONING COMPRESSOR Click here

    A

  8. INSPECT MAGNETIC CLUTCH


    1. A011B1PE02
      Text in Illustration
      *1

      Component without harness connected

      (Magnetic Clutch)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - Body ground Always 3.4 to 3.8 Ω

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

      Result
      Result Proceed to
      OK A
      NG (for 1KR-FE) B
      NG (for 1ND-TV) C

    3. Reconnect the air conditioning compressor connector.

    4. Reconnect the magnetic clutch connector.


    B

    REPLACE MAGNETIC CLUTCH Click here

    C

    REPLACE MAGNETIC CLUTCH Click here

    A

  9. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING COMPRESSOR - INTEGRATION RELAY)

    A0118TLE01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Air Conditioning Compressor)
    *2

    Front view of wire harness connector

    (to Integration Relay)

    1. Disconnect the B33 air conditioning compressor connector.

    2. Remove the 1F integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      B33-3 (MG+) - 1F-9*1

      B33-3 (MG+) - 1F-3*2

      		 Always Below 1 Ω
      B33-3 (MG+) - Body ground Always 10 kΩ or higher

      • *1: for 1KR-FE

      • *2: for 1ND-TV

    4. Reconnect the integration relay connector.

    5. Reconnect the air conditioning compressor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER Click here

  10. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - BATTERY)

    A011707E01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Integration Relay)

    1. Remove the 1D integration relay connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      1D-6 - Body ground Ignition switch off Below 1 V
      1D-6 - Body ground Ignition switch ON 11 to 14 V

    3. Reconnect the integration relay connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR CONDITIONING AMPLIFIER - INTEGRATION RELAY)

  11. REPLACE AIR CONDITIONING AMPLIFIER


    1. Replace the air conditioning amplifier with a normal one Click here.

    2. Check that the condition returns to normal.

      OK
      Same problem does not occur.
      Result
      Result Proceed to
      OK A
      NG (for 1KR-FE) B
      NG (for 1ND-TV) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    END (AIR CONDITIONING AMPLIFIER IS FAULTY)