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 signal is sent from the MGC terminal of the air conditioning amplifier assembly. Then, the MG/CLT relay turns on to operate the magnet clutch assembly.

WIRING DIAGRAM

A01QU2NE01
*a MG/CLT Relay
*b from IG1 NO.1 Relay
*c Air Conditioning Amplifier Assembly
*d Magnet Clutch Assembly

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. INSPECT MAGNET CLUTCH RELAY (MG/CLT)


    1. A01QU75N01

      Remove the MG/CLT relay from the No. 2 engine room relay 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
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAGNET CLUTCH RELAY (MG/CLT)

    OK

  2. INSPECT MAGNET CLUTCH ASSEMBLY


    1. A01QU3ON04

      Remove the cooler compressor assembly.

      Click here

    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 magnet clutch hub and rotor lock.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 2 ENGINE ROOM RELAY BLOCK - BATTERY)


    1. A01QUE8C01
      *1 MG/CLT Relay
      *a

      Component without relay installed

      (No. 2 Engine Room Relay Block)

      Remove the MG/CLT relay from the No. 2 engine room relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      MG/CLT relay terminal 1 - Body ground Ignition switch ON 11 to 14 V
      MG/CLT relay terminal 5 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01QSUSC06
      *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
      G81-20 (MGC) - Body ground Ignition switch off Below 1 V
      G81-20 (MGC) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (NO. 2 ENGINE ROOM RELAY BLOCK - MAGNET CLUTCH ASSEMBLY)


    1. Remove the MG/CLT relay from the No. 2 engine room relay block.

    2. Disconnect the B68 magnet clutch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      MG/CLT relay terminal 3 - B68-3 (MG+) Always Below 1 Ω
      B68-3 (MG+) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR