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 semiconductor pwr integration ECU turns on to operate the magnetic clutch assembly.

WIRING DIAGRAM

B0075X9E12

CAUTION / NOTICE / HINT

Note


  • ECM malfunctions can affect the storage of this DTC. Therefore, check all SFI system DTCs and confirm that the system is normal before performing the following inspection.

    for 2GR-FSE (w/ Canister Pump Module): Click here

    for 2GR-FSE (w/o Canister Pump Module): Click here

    for 8AR-FTS (w/ Canister Pump Module): Click here

    for 8AR-FTS (w/o Canister Pump Module): Click here

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

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Using the GTS, check if the CAN communication system is functioning normally.

      Click here

      Result
      Result Proceed to
      CAN communication system DTCs are not output A
      CAN communication system DTCs are output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK SEMICONDUCTOR PWR INTEGRATION ECU


    1. Using a voltmeter, check the signal reading of the semiconductor pwr integration ECU.

      Click here

      OK
      A normal signal reading is output.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK SEMICONDUCTOR PWR INTEGRATION ECU (RESULT OF SIGNAL READING) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - POWER SOURCE AND BODY GROUND)


    1. Remove the semiconductor pwr integration ECU from the No. 2 engine room relay block and No. 2 junction block assembly.

      Click here

      B0076MIC15
      *a

      Component without semiconductor pwr integration ECU connected

      (No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly)

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2A-1 (ALT) - Body ground Always 11 to 14 V
      2B-1 (BATT) - Body ground Always 11 to 14 V
      2D-11 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      2D-11 (IG) - Body ground Engine switch off Below 1 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2D-14 (GND1) - Body ground Always Below 1 Ω
      2G-5 (GND2) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - COOLER COMPRESSOR ASSEMBLY)


    1. Disconnect the F54 cooler compressor assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2D-12 (L) - F54-3 (MG+) Always Below 1 Ω
      2D-12 (L) or F54-3 (MG+) - 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 (SEMICONDUCTOR PWR INTEGRATION ECU - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the O9 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
      2D-4 (-S) - O9-18 (MGC) Always Below 1 Ω
      2D-4 (-S) or O9-18 (MGC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK MAGNETIC CLUTCH ASSEMBLY


    1. Connect the magnetic clutch assembly connector.

    2. B0073XJC02
      *a

      Component without harness connected

      (Cooler Compressor Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (MG+) - Body ground 20°C (68°F) 3.8 to 4.2 Ω

    3. When connector terminal 3 (MG+) is connected to a positive (+) battery terminal, check that the following occurs: 1) the magnetic clutch operating sound can be heard, and 2) the magnetic clutch hub and rotor lock.

      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE MAGNETIC CLUTCH ASSEMBLY Click here