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

DESCRIPTION

The air conditioning amplifier assembly outputs the magnet clutch on request signal to the ECM. The ECM sends a magnet clutch on permission signal to the air conditioning amplifier assembly. The air conditioning amplifier assembly turn the magnet clutch on based on the signal.

WIRING DIAGRAM

A01J6A1E09

INSPECTION PROCEDURE

Note

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

PROCEDURE


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


    1. Use the Data List to check if the magnet clutch on request signal is functioning properly Click here.

      ECM
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/C Signal Magnet clutch on request signal / ON or OFF

      ON: A/C switch on

      OFF: A/C switch off

      		 Check this item with the engine idling and the blower switch on (LO level).
      OK
      Display is as specified in normal condition.

    NG

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - ECM) Click here

    OK

  2. INSPECT MAGNET CLUTCH RELAY


    1. A01J6SPE02

      Remove the magnet clutch relay.

    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

    OK

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


    1. A01J43QE28
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the A38 air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A38-13 (MGC) - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A01J6KTE19
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A38-13 (MGC) - Body ground

      • Engine idling

      • Blower switch on (LO level)

      • A/C switch on

      		 Below 1 V

      • Engine idling

      • Blower switch on (LO level)

      • A/C switch off

      		 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - ECM) Click here

    OK

  5. INSPECT MAGNET CLUTCH ASSEMBLY


    1. A01J696

      Remove the cooler compressor assembly.


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

      OK
      Measurement Connection Specified Condition

      Battery positive (+) → Terminal 1

      Battery negative (-) → Ground wire

      		 Magnet clutch engages
      Result
      Result Proceed to
      OK A
      NG (for 2TR-FE) B
      NG (for 1GR-FE) C

    B

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    C

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    A

  6. CHECK HARNESS AND CONNECTOR (MAGNET CLUTCH RELAY - COOLER COMPRESSOR ASSEMBLY AND BATTERY)


    1. Disconnect the A2 compressor connector.

    2. Remove the magnet clutch relay.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      M5-5 - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M5-3 - A2-1 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  7. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - ECM)


    1. Disconnect the A38 air conditioning amplifier assembly connector.

    2. Disconnect the E9*1 or E13*2 ECM connector.


      • *1: for 2TR-FE

      • *2: for 1GR-FE

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

      Standard Resistance
      for 2TR-FE
      Tester Connection Condition Specified Condition
      A38-7 (ACT) - E9-25 (ACT) Always Below 1 Ω
      A38-7 (ACT) - Body ground Always 10 kΩ or higher
      for 1GR-FE
      Tester Connection Condition Specified Condition
      A38-7 (ACT) - E13-25 (ACT) Always Below 1 Ω
      A38-7 (ACT) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A01J6KTE20
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A38-7 (ACT) - Body ground

      • Engine idling

      • Blower switch on (LO level)

      • A/C switch on (magnet clutch on)

      		 11 to 14 V

      • Engine idling

      • Blower switch on (LO level)

      • A/C switch off or on (magnet clutch off)

      		 Below 1 V
      Result
      Result Proceed to
      OK A
      NG (for 2TR-FE) B
      NG (for 1GR-FE) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  9. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - ECM)


    1. Disconnect the A38 air conditioning amplifier assembly connector.

    2. Disconnect the E9*1 or E13*2 ECM connector.


      • *1: for 2TR-FE

      • *2: for 1GR-FE

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

      Standard Resistance
      for 2TR-FE
      Tester Connection Condition Specified Condition
      A38-21 (AC1) - E9-24 (AC1) Always Below 1 Ω
      A38-21 (AC1) - Body ground Always 10 kΩ or higher
      for 1GR-FE
      Tester Connection Condition Specified Condition
      A38-21 (AC1) - E13-24 (AC1) Always Below 1 Ω
      A38-21 (AC1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A01J6KTE21
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A38-21 (AC1) - Body ground

      • Engine idling

      • Blower switch on (LO level)

      • A/C switch on

      		 Below 1 V

      • Engine idling

      • Blower switch on (LO level)

      • A/C switch off

      		 11 to 14 V
      Result
      Result Proceed to
      NG A
      OK (for 2TR-FE) B
      OK (for 1GR-FE) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here