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

DESCRIPTION

When the engine is running, If refrigerant pressure does not decrease when the A/C switch is turned off, the following factors may be the cause.

Symptom Factor

  • Cooler compressor assembly does not stop operating

  • Refrigerant pressure does not decrease when A/C switch is turned off

  • Short to +B in air conditioning amplifier assembly circuit malfunction

  • MG CLT relay malfunction

  • Magnet clutch assembly malfunction

  • Harness or connector

WIRING DIAGRAM

B008821E01

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. INSPECT MG CLT RELAY


    1. Inspect the MG CLT relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MG CLT RELAY

    OK

  2. CHECK HARNESS AND CONNECTOR (MG CLT RELAY - POWER SOURCE)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3 (MG CLT relay) - Body ground Always 11 to 14 V
      1 (MG CLT relay) - Body ground Ignition switch off Below 1 V
      1 (MG CLT relay) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (MG CLT RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the K55 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (MG CLT relay) - K55-9 (MGC) Always Below 1 Ω
      2 (MG CLT relay) or K55-9 (MGC) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (MG CLT RELAY - MAGNET CLUTCH ASSEMBLY AND BODY GROUND)


    1. Disconnect the C63 magnet clutch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5 (MG CLT relay) - C63-3 (MG+) Always Below 1 Ω
      5 (MG CLT relay) or C63-3 (MG+) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (MAGNET CLUTCH ASSEMBLY - BODY GROUND)


    1. Connect the C63 magnet clutch assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C63-3 (MG+) - Body ground

      Engine running

      (A/C switch: Off)

      		 Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAGNET CLUTCH ASSEMBLY for 6AR-FSE: Click here
    REPLACE MAGNET CLUTCH ASSEMBLY for 2GR-FKS: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR