AIR CONDITIONING SYSTEM Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION

When the air conditioning amplifier assembly is turned on, a magnetic clutch on signal is sent from the MGC terminal of the air conditioning amplifier assembly. Then, the engine room junction block assembly turns on to operate the magnetic clutch assembly.

WIRING DIAGRAM

A01G63WE02

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY


    1. Using a voltmeter, check the signal reading of the engine room junction block assembly Click here.

      OK
      A normal signal reading is output.

    NG

    INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (RESULT OF SIGNAL READING CHECK) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY POWER SOURCE AND BODY GROUND)


    1. Remove the engine room junction block assembly from the engine room relay block and junction block assembly Click here.

      A01G71KE05
      Text in Illustration
      *a

      Component without engine room junction block assembly connected

      (Engine Room Relay Block and Junction Block Assembly)

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A-1 (BATT) - Body ground Always 11 to 14 V
      B-1 (ALT) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1F-3 (GND1) - Body ground Always Below 1 Ω
      1G-4 (GND2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - MAGNETIC CLUTCH ASSEMBLY)


    1. Disconnect the D65 cooler compressor assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1M-1 (MGCT) - D65-3 (MG+) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT COOLER COMPRESSOR ASSEMBLY


    1. Disconnect the a2 magnetic clutch assembly connector.

    2. A01G8VUE05
      Text in Illustration
      *a

      Component without harness connected

      (Cooler Compressor Assembly)
      *b

      Component without harness connected

      (Magnetic Clutch Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D65-3 (MG+) - a2-1 Always Below 1 Ω
      D65-3 (MG+) - Body ground Always 10 kΩ or higher

    NG

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    OK

  5. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY


    1. Disconnect the H54 air conditioning amplifier assembly connector.

    2. Reconnect the engine room junction block assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H54-20 (MGC) - Body ground Engine switch off Below 1 V
      H54-20 (MGC) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - ENGINE ROOM JUNCTION BLOCK ASSEMBLY) Click here

    OK

  6. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Reconnect the H54 air conditioning amplifier assembly connector.

    2. A01G4KPE20
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H54-20 (MGC) - Body ground

      Engine switch on (IG)

      A/C switch: off

      		 11 to 14 V
      H54-20 (MGC) - Body ground

      Engine switch off

      A/C switch: on

      		 Below 1 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

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

  7. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - ENGINE ROOM JUNCTION BLOCK ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H54-20 (MGC) - 1F-9 (MCLS) Always Below 1 Ω
      H54-20 (MGC) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY Click here