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 magnet clutch relay turns on to operate the magnet clutch assembly.

WIRING DIAGRAM


  1. for 1VD-FTV (w/ DPF):

    B001A5PE09

  2. for 1VD-FTV (w/o DPF):

    B001A5PE10

  3. for 3UR-FE:

    B001A5PE11

CAUTION / NOTICE / HINT

Note


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

  • Since the air conditioning system has functions that use CAN communication system, first confirm that there is no malfunction in the communication system by inspecting the CAN communication functions in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure Click here.

PROCEDURE


  1. READ VALUE USING GTS (A/C SWITCH SIGNAL)


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

      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

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

    OK

  2. INSPECT MAGNET CLUTCH RELAY (MG CLT)


    1. Remove the MG CLT relay from the No. 1 engine room relay block.

    2. Inspect the MG CLT relay Click here.


    NG

    REPLACE MAGNET CLUTCH RELAY Click here

    OK

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


    1. B001A1DE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the 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
      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

  4. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. B00186XE01
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Reconnect the 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
      E36-18 (MGC) - Body ground

      • Engine idling

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

      • Blower switch LO

      		 11 to 14 V
      E36-18 (MGC) - Body ground

      • Engine idling

      • A/C switch on (magnet clutch on)

      • Blower switch LO

      		 Below 1 V

    NG

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

    OK

  5. CHECK COOLER COMPRESSOR ASSEMBLY


    1. Disconnect the C37 cooler compressor assembly connector.

    2. Disconnect the magnet clutch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C37-3 (MG+) - 1 Always Below 1 Ω
      C37-3 (MG+) or 1 -Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG (for 1VD-FTV) B
      NG (for 3UR-FE) C

    B

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    C

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    A

  6. INSPECT MAGNET CLUTCH ASSEMBLY


    1. Remove the magnet clutch assembly.


    2. Inspect the magnet clutch assembly.


      Result
      Result Proceed to
      OK A
      NG (for 1VD-FTV) B
      NG (for 3UR-FE) C

    B

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    C

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    A

  7. CHECK HARNESS AND CONNECTOR (MAGNET CLUTCH RELAY - BATTERY)


    1. Remove the MG CLT relay from the No. 1 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 MG CLT relay terminal 5 - Body ground Engine switch on (IG) 11 to 14 V
      Relay block MG CLT relay terminal 1 - Body ground Engine switch on (IG) 11 to 14 V

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    • *1: for LHD

    • *2: for RHD


    1. for 1VD-FTV (w/ DPF):


      1. Disconnect the A85*1 or A86*2 ECM connector.

    2. for 1VD-FTV (w/o DPF):


      1. Disconnect the A85 ECM connector.

    3. for 3UR-FE:


      1. Disconnect the A38*1 or A87*2 ECM connector.

    4. Disconnect the E36 air conditioning amplifier assembly connector.

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

      Standard Resistance
      for 1VD-FTV (w/ DPF)
      Tester Connection Condition Specified Condition
      A85-18 (ACT) - E36-22 (ACT)*1 Always Below 1 Ω
      A85-30 (AC1) - E36-11 (AC1)*1 Always Below 1 Ω
      A86-18 (ACT) - E36-22 (ACT)*2 Always Below 1 Ω
      A86-30 (AC1) - E36-11 (AC1)*2 Always Below 1 Ω
      A85-18 (ACT) or E36-22 (ACT) - Body ground*1 Always 10 kΩ or higher
      A85-30 (AC1) or E36-11 (AC1) - Body ground*1 Always 10 kΩ or higher
      A86-18 (ACT) or E36-22 (ACT) - Body ground*2 Always 10 kΩ or higher
      A86-30 (AC1) or E36-11 (AC1) - Body ground*2 Always 10 kΩ or higher
      for 1VD-FTV (w/o DPF)
      Tester Connection Condition Specified Condition
      A85-18 (ACT) - E36-22 (ACT) Always Below 1 Ω
      A85-30 (AC1) - E36-11 (AC1) Always Below 1 Ω
      A85-18 (ACT) or E36-22 (ACT) - Body ground Always 10 kΩ or higher
      A85-30 (AC1) or E36-11 (AC1) - Body ground Always 10 kΩ or higher
      for 3UR-FE
      Tester Connection Condition Specified Condition
      A38-17 (ACT) - E36-22 (ACT)*1 Always Below 1 Ω
      A38-9 (AC1) - E36-11 (AC1)*1 Always Below 1 Ω
      A87-17 (ACT) - E36-22 (ACT)*2 Always Below 1 Ω
      A87-9 (AC1) - E36-11 (AC1)*2 Always Below 1 Ω
      A38-17 (ACT) or E36-22 (ACT) - Body ground*1 Always 10 kΩ or higher
      A38-9 (AC1) or E36-11 (AC1) - Body ground*1 Always 10 kΩ or higher
      A87-17 (ACT) or E36-22 (ACT) - Body ground*2 Always 10 kΩ or higher
      A87-9 (AC1) or E36-11 (AC1) - Body ground*2 Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. B0018URE01
      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 Switch Condition Specified Condition
      E36-11 (AC1) - Body ground

      • Engine idling

      • A/C switch off

      • Blower switch LO

      		 11 to 14 V
      E36-11 (AC1) - Body ground

      • Engine idling

      • A/C switch on

      • Blower switch LO

      		 Below 1 V
      Result
      Result Proceed to
      OK A
      NG (for 1VD-FTV) B
      NG (for 3UR-FE) C

    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

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


    • *1: for LHD

    • *2: for RHD


    1. for 1VD-FTV (w/ DPF):


      1. Disconnect the A85*1 or A86*2 ECM connector.

    2. for 1VD-FTV (w/o DPF):


      1. Disconnect the A85 ECM connector.

    3. for 3UR-FE:


      1. Disconnect the A38*1 or A87*2 ECM connector.

    4. Disconnect the E36 air conditioning amplifier assembly connector.

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

      Standard Resistance
      for 1VD-FTV (w/ DPF)
      Tester Connection Condition Specified Condition
      A85-18 (ACT) - E36-22 (ACT)*1 Always Below 1 Ω
      A86-18 (ACT) - E36-22 (ACT)*2 Always Below 1 Ω
      A85-18 (ACT) or E36-22 (ACT) - Body ground*1 Always 10 kΩ or higher
      A86-18 (ACT) or E36-22 (ACT) - Body ground*2 Always 10 kΩ or higher
      for 1VD-FTV (w/o DPF)
      Tester Connection Condition Specified Condition
      A85-18 (ACT) - E36-22 (ACT) Always Below 1 Ω
      A85-18 (ACT) or E36-22 (ACT) - Body ground Always 10 kΩ or higher
      for 3UR-FE
      Tester Connection Condition Specified Condition
      A38-17 (ACT) - E36-22 (ACT)*1 Always Below 1 Ω
      A87-17 (ACT) - E36-22 (ACT)*2 Always Below 1 Ω
      A38-17 (ACT) or E36-22 (ACT) - Body ground*1 Always 10 kΩ or higher
      A87-17 (ACT) or E36-22 (ACT) - Body ground*2 Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK ECM


    1. B001ALME02
      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 Switch Condition Specified Condition
      E36-22 (ACT) - Body ground

      • Engine idling

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

      • Blower switch LO

      		 Below 1V
      E36-22 (ACT) - Body ground

      • Engine idling

      • A/C switch on (magnet clutch on)

      • Blower switch LO

      		 4.5 to 5.5 V
      Result
      Result Proceed to
      OK A
      NG (for 1VD-FTV) B
      NG (for 3UR-FE) C

    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here