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

DTC Code DTC Name
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

E271242E01

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. E273613N01

      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. E198322N04

      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. E271243C01

      *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. E269948C06

      *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