AIR CONDITIONING SYSTEM Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION

When the air conditioning amplifier assembly is turned ON, a magnet clutch on signal is sent from the MGC terminal of the air conditioning amplifier assembly. Then, the No. 1 semiconductor power integration ECU turns on to operate the magnet clutch assembly.

WIRING DIAGRAM

B006DV1E01

CAUTION / NOTICE / HINT

Note


  • The air conditioning system uses the CAN communication system and CXPI system. First, confirm that there is no malfunction in the CAN communication system and CXPI system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here

  • 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.

    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

      OK
      CAN communication system DTCs are not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  2. CHECK CXPI COMMUNICATION SYSTEM


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

      Click here

      OK
      CXPI communication system DTCs are not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO CXPI COMMUNICATION SYSTEM Click here

    OK

  3. CHECK POWER INTEGRATION SYSTEM


    1. Using the GTS, check if the power integration system is functioning normally.

      Click here

      OK
      Power integration system DTCs are not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO POWER INTEGRATION SYSTEM Click here

    OK

  4. CHECK COOLER COMPRESSOR ASSEMBLY


    1. Disconnect the D72 cooler compressor assembly connector.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    6. Check the operation by referring to the table below.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Magnetic Clutch Relay Air conditioning system operation OFF/ON

      Perform this test when the following conditions are met:


      • Engine switch on (IG)

      • Air conditioning system is operated

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Magnetic Clutch Relay

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A61-4 (L) - Body ground Perform Active Test and select "OFF" 11 to 14 V
      Perform Active Test and select "ON" Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU) Click here

    OK

  5. READ VALUE USING GTS (STATUS OF A/C MAGNETIC CLUTCH FUSE)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Power Integration No.1 / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of A/C Magnetic Clutch Fuse Cooler compressor assembly fuse Connect or Disconnect

      Connect: Fuse not shut off

      Disconnect: Fuse shut off

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      Status of A/C Magnetic Clutch Fuse
      OK
      The Data List value displays "Connect".
      Result
      Proceed to
      OK
      NG

    NG

    CHECK COOLER COMPRESSOR ASSEMBLY Click here

    OK

  6. READ VALUE USING GTS (A/C MAGNETIC CLUTCH INPUT SIGNAL)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Power Integration No.1 / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      A/C Magnetic Clutch Input Signal Cooler Compressor assembly input status OFF or ON

      OFF: Cooler compressor assembly does not operate

      ON: Cooler compressor assembly operates

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      A/C Magnetic Clutch Input Signal
      OK
      Display changes according to heater accessory operation.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK

  7. READ VALUE USING GTS (A/C MAGNETIC CLUTCH OUTPUT SIGNAL)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Power Integration No.1 / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      A/C Magnetic Clutch Output Signal Cooler compressor assembly output status OFF or ON

      OFF: Cooler compressor assembly does not operate

      ON: Cooler compressor assembly operates

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      A/C Magnetic Clutch Output Signal
      OK
      Display changes according to Cooler compressor operation.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    OK

  8. INSPECT COOLER COMPRESSOR ASSEMBLY


    1. Remove the cooler compressor assembly.

      Click here

    2. Inspect the cooler compressor assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (COOLER COMPRESSOR ASSEMBLY - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the D72 cooler compressor assembly connector.

    2. Disconnect the A61 No. 1 semiconductor power integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D72-3 (MG+) - A61-4 (L) Always Below 1 Ω
      D72-3 (MG+) or A61-4 (L) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK COOLER COMPRESSOR ASSEMBLY


    1. Disconnect the D72 cooler compressor assembly connector.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / Power Integration No.1 / Data List.

    6. Read the Data List according to the display on the GTS.


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of A/C Magnetic Clutch Fuse Cooler compressor assembly fuse Connect or Disconnect

      Connect: Fuse not shut off

      Disconnect: Fuse shut off

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      Status of A/C Magnetic Clutch Fuse
      OK
      The Data List value displays "Connect".
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 9 Click here

    NG

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

  11. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the G64 air conditioning amplifier assembly connector.

    2. Disconnect the A61 No. 1 semiconductor power integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G64-9 (MGC) - A61-5 (-S) Always Below 1 Ω
      G64-9 (MGC) or A61-5 (-S) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR