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

DESCRIPTION

The air conditioning amplifier assembly outputs the magnet clutch ON request signal to the ECM. The ECM sends a magnet clutch ON permission signal to the air conditioning amplifier assembly. The air conditioning amplifier assembly turns the magnet clutch on based on this signal.

WIRING DIAGRAM

B003JIEE09

CAUTION / NOTICE / HINT

Note


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

  • When the servo motor or air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization.

    Click here

PROCEDURE


  1. READ VALUE USING GTS (A/C SIGNAL)


    1. Use the Data List to check if the magnet clutch ON request signal is functioning properly.

      Click here


      Powertrain > Engine and ECT > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      A/C Signal Magnet clutch ON request signal ON or OFF

      ON: "A/C" switch on

      OFF: "A/C" switch off

      		 Operates with the engine idling and the blower switch on (LO level).

      Powertrain > Engine and ECT > Data List
      Tester Display
      A/C Signal
      OK
      Display is as specified in normal condition.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - ECM) Click here

    OK

  2. INSPECT MAGNET CLUTCH RELAY (A/C COMP)


    1. Remove the A/C COMP relay from the No. 4 instrument panel relay block assembly.

    2. Inspect the A/C COMP relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAGNET CLUTCH RELAY (A/C COMP RELAY)

    OK

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


    1. Disconnect the air conditioning amplifier assembly connector.

    2. B003MNPC24
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G37-20 (MGC) - Body ground Engine switch off Below 1 V
      G37-20 (MGC) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Remove the air conditioning amplifier assembly with its connectors still connected.

      Click here

    2. B003MYTC01
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G37-20 (MGC) - Body ground

      • Engine idling

      • Blower switch: On (LO level)

      • "A/C" switch: On (magnet clutch on)

      		 Below 1 V
      G37-20 (MGC) - Body ground

      • Engine idling

      • Blower switch: On (LO level)

      • "A/C" switch: Off or on (magnet clutch off)

      		 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - ECM) Click here

    OK

  5. INSPECT MAGNET CLUTCH ASSEMBLY


    1. Remove the compressor assembly with magnet clutch.

      Click here

    2. Inspect the compressor assembly with magnet clutch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAGNET CLUTCH ASSEMBLY Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (A/C COMP RELAY - COMPRESSOR ASSEMBLY WITH MAGNET CLUTCH AND BATTERY)


    1. Remove the magnet A/C COMP relay assembly from the No. 4 instrument panel junction block assembly.

    2. Disconnect the C3 compressor assembly with magnet clutch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay terminal 3 - C3-1 (MG+) Always Below 1 Ω
      Relay terminal 3 or C3-1 (MG+) - Body ground Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Relay terminal 5 - Body ground Engine switch off Below 1 V
      Relay terminal 5 - Body ground Engine switch on (IG) 11 to 14 V
      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

  7. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - ECM)


    1. Disconnect the G37 air conditioning amplifier assembly connector.

    2. Disconnect the G50 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G37-17 (AC1) - G50-15 (AC1) Always Below 1 Ω
      G37-24 (ACT) - G50-14 (ACT) Always Below 1 Ω
      G37-17 (AC1) or G50-15 (AC1) - Body ground Always 10 kΩ or higher
      G37-24 (ACT) or G50-14 (ACT) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Remove the air conditioning amplifier assembly with its connectors still connected.

      Click here

    2. B003MYTC02
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G37-17 (AC1) - Body ground

      • Engine idling

      • Blower switch: On (LO level)

      • "A/C" switch: On

      		 Below 1 V
      G37-17 (AC1) - Body ground

      • Engine idling

      • Blower switch: On (LO level)

      • "A/C" switch: Off

      		 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  9. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - ECM)


    1. Disconnect the G37 air conditioning amplifier assembly connector.

    2. Disconnect the G50 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G37-24 (ACT) - G50-14 (ACT) Always Below 1 Ω
      G37-24 (ACT) or G50-14 (ACT) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK ECM


    1. Remove the air conditioning amplifier assembly with its connectors still connected.

      Click here

    2. B003MYTC03
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G37-24 (ACT) - Body ground

      • Engine idling

      • Blower switch: On (LO level)

      • "A/C" switch: Off or on (magnet clutch off)

      		 Below 1 V
      G37-24 (ACT) - Body ground

      • Engine idling

      • Blower switch: On (LO level)

      • "A/C" switch: On (magnet clutch on)

      		 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPLACE ECM Click here