AIR CONDITIONING SYSTEM Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION

When the A/C amplifier is turned on, a magnetic clutch ON signal is sent from the MGC terminal of the A/C amplifier. Then, the MG/CLT relay turns on to operate the magnetic clutch.

WIRING DIAGRAM

A019MGSE14

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the intelligent tester to check if the CAN communication system is functioning normally.

      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. INSPECT RELAY (MG/CLT)


    1. A019MYBE04

      Remove the MG/CLT relay from the engine room relay block and junction block.

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

      Standard Resistance
      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5

      Below 1 Ω

      (when battery voltage is applied to terminals 1 and 2)

    NG

    REPLACE RELAY (MG/CLT)

    OK

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


    1. A019L4KE01
      Text in Illustration
      *1

      Component without relay installed

      (Engine Room Relay Block and Junction Block)

      Remove the MG/CLT relay from the engine room relay block and junction block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Relay block MG/CLT relay terminal 1 - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)


    1. A019L63E45
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Amplifier)

      Disconnect the A/C amplifier connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F50-20 (MGC) - Body ground Engine switch off Below 1 V
      F50-20 (MGC) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT A/C AMPLIFIER


    1. A019MH4E90
      Text in Illustration
      *1

      Component with harness connected

      (A/C Amplifier)

      Reconnect the A/C amplifier connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F50-20 (MGC) - Body ground

      Engine switch on (IG)

      A/C switch: off

      		 11 to 14 V
      F50-20 (MGC) - Body ground

      Engine switch on (IG)

      A/C switch: on

      		 Below 1 V

    NG

    REPLACE A/C AMPLIFIER Click here

    OK

  6. INSPECT A/C COMPRESSOR


    1. A019OU5E18

      Disconnect the A/C compressor connector.

    2. A019MKVE11

      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
      D7-3 (MG+) - d17-1 Always Below 1 Ω
      D7-3 (MG+) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Component without harness connected

      (A/C Compressor)
      *2

      Component without harness connected

      (Magnetic Clutch)

    NG

    REPLACE A/C COMPRESSOR Click here

    OK

  7. INSPECT MAGNETIC CLUTCH


    1. A019JYRE11
      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
      d17-1 - Body ground 20°C (68°F) 3.8 to 4.2 Ω

    2. When connector terminal d17-1 is connected to a 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.


    NG

    REPLACE MAGNETIC CLUTCH Click here

    OK

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


    1. A019L4KE01
      Text in Illustration
      *1

      Component without relay installed

      (Engine Room Relay Block and Junction Block

      Remove the MG/CLT relay from the engine room relay block and junction block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Relay block MG/CLT relay terminal 5 - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK - A/C COMPRESSOR)


    1. A019OL9E01
      Text in Illustration
      *1

      Component without relay installed

      (Engine Room Relay Block and Junction Block)
      *2

      Front view of wire harness connector

      (to A/C Compressor)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay block MG/CLT relay terminal 3 - D7-3 (MG+) Always Below 1 Ω
      D7-3 (MG+) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (When troubleshooting according to Problem Symptoms Table) B
      OK (When troubleshooting according to the DTC) C

    B

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

    C

    REPLACE A/C AMPLIFIER Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR