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

DESCRIPTION

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

WIRING DIAGRAM

A004HMHE02

CAUTION / NOTICE / HINT

Note


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

PROCEDURE


  1. READ VALUE USING GTS


    1. Enter the following menus : Body Electrical / Air Conditioner / Date List.

    2. Check the valve(s) by referring to the table below.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note

      Pressure Switch Operation

      (Pressure Switch Oper)

      Pressure switch status /

      Normal or Abnormal

      		 Normal -
      OK
      The display is as specified in the normal condition column.
      Result Proceed to
      NG A
      OK B

    B

    READ VALUE USING GTS Click here

    A

  2. CHECK REFRIGERANT VOLUME


    1. Check the refrigerant volume (for HFC-1234yf (R1234yf)) Click here

    2. Check the refrigerant volume (for HFC-134a (R134a)) Click here


    NG

    CHARGE REFRIGERANT

    OK

  3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONER TUBE AND ACCESSORY ASSEMBLY - POWER SOURCE)


    1. Disconnect the A7 air conditioner tube and accessory assembly connector.

    2. A004JC9E03

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A7-4(B) - Body ground Ignition switch on 11 to 14 V
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Air Conditioner Tube and Accessory Assembly)

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONER TUBE AND ACCESSORY ASSEMBLY - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A7-2(E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONER TUBE AND ACCESSORY ASSEMBLY - ECM)


    1. Disconnect the A33 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A7-3(ACP) - A33-8(ACP) Always Below 1 Ω
      A7-3(ACP) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (AIR CONDITIONER TUBE AND ACCESSORY ASSEMBLY - AIR CONDITIONING CONTROL ASSEMBLY)


    1. Disconnect the D19 air conditioning control assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A7-1(AC) - D19-2(PSW) Always Below 1 Ω
      A7-1(AC) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  7. INSPECT AIR CONDITIONER TUBE AND ACCESSORY ASSEMBLY


    1. Inspect the air conditioner tube and accessory assembly Click here


    OK

    REPLACE ECM

    NG

    REPLACE AIR CONDITIONER TUBE AND ACCESSORY ASSEMBLY

  8. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus : Powertrain / Engine and ECT / Date List.

    5. Check the value(s) by referring to the table below.

      Engine
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/C Signal A/C switch status / ON or OFF

      ON: A/C switch on

      OFF: A/C switch off

      		 The air conditioning control assembly sends the A/C switch signal to the ECM via CAM communication
      OK
      The display is as specified in the normal condition column.
      Result Proceed to
      NG A
      OK B

    B

    INSPECT RELAY (HEATER) Click here

    A

  9. CHECK HARNESS AND CONNECTOR (HEATER RELAY - AIR CONDITIONING CONTROL ASSEMBLY)


    1. Remove the heater relay from the engine room relay block assembly.

    2. Disconnect the D19 air conditioning control assembly connector.

    3. A004JO4E01
      Text in Illustration
      *1 Engine room relay block assembly

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 - D19-2(PSW) Always Below 1 Ω
      2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (HEATER RELAY - ECM)


    1. Disconnect the A35 ECM connector.

    2. A004JO4E01
      Text in Illustration
      *1 Engine room relay block assembly

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A35-35(AC) - 1 Always Below 1 Ω
      A35-35(AC) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  11. INSPECT RELAY (HEATER)


    1. Inspect the heater relay Click here.


    NG

    REPLACE HEATER RELAY

    OK

  12. CHECK HARNESS AND CONNECTOR (HEATER RELAY - POWER SOURCE)


    1. A004JO4E01
      Text in Illustration
      *1 Engine room relay block assembly

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5 - Body ground Ignition switch off Below 1 V
      Ignition switch on 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  13. CHECK HARNESS AND CONNECTOR (HEATER RELAY - COMPRESSOR WITH MAGNET CLUTCH)


    1. Disconnect the C17 compressor with magnet clutch connector.

    2. A004JO4E01
      Text in Illustration
      *1 Engine room relay block assembly

      Measure the valve(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      C17-1(MG+) - 3 Always Below 1 Ω
      C17-1(MG+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  14. INSPECT COMPRESSOR WITH MAGNET CLUTCH


    1. Inspect the compressor with magnet clutch Click here.


    NG

    REPLACE COMPRESSOR WITH MAGNET CLUTCH Click here

    OK

  15. INSPECT AIR CONDITIONING CONTROL ASSEMBLY


    1. A004HHOE02
      Text in Illustration
      *1

      Component with harness connected

      (Air Conditioning Control Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D19-2(PSW) - Body ground

      • Ignition switch on

      • A/C switch : off

      		 11 to 14 V

      • Ignition switch on

      • A/C switch : on

      		 Below 1 V

    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

    OK

  16. REPLACE ECM


    1. Replace the blower resistor with a new or normally functioning one Click here


    NEXT

  17. READ VALUE USING GTS


    1. Enter the following menus : Body Electrical / Air Conditioner / Date List.

    2. Check the valve(s) by referring to the table below.

      Air Conditioner
      Tester Display Measurement item/Range Normal Condition Diagnostic Note

      Pressure Switch Operation

      (Pressure Switch Oper)

      Pressure switch status /

      Normal or Abnormal

      		 Normal -

    OK

    END (ECM IS FAULTY)

    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here