AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B1451/51

DTC Code DTC Name
B1451/51 Compressor Solenoid Circuit

DESCRIPTION

In this circuit, the compressor assembly with pulley*1 or cooler compressor assembly*2 receives a refrigerant compression demand signal from the air conditioning amplifier assembly.

Based on this signal, the compressor assembly with pulley*1 or cooler compressor assembly*2 changes the amount of compressor output.

  • *1: w/o Magnet Clutch

  • *2: w/ Magnet Clutch

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

B1451/51

Compressor Solenoid Circuit

Open or short in compressor solenoid circuit

  • Compressor assembly with pulley (w/o Magnet Clutch)

  • Cooler compressor assembly (w/ Magnet Clutch)

  • Harness or connector

  • Air conditioning amplifier assembly

-

-

Tip:

The air conditioning amplifier assembly stores the DTC of the respective malfunction if it has occurred for the period of time indicated in the brackets.

WIRING DIAGRAM

E229254E35

CAUTION / NOTICE / HINT

Note:

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

Click here

PROCEDURE

  1. 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: Body Electrical / Air Conditioner / Data List.

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

      Body Electrical > Air Conditioner > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Regulator Control Current

      Solenoid valve control current

      Min.: 0 A

      Max.: 0.997 A

      Value changes between 0 A and 0.997 A in accordance with solenoid valve operation

      -

      Body Electrical > Air Conditioner > Data List

      Tester Display

      Regulator Control Current

      OK

      The display is as specified in the normal condition column.

    Result

    Result

    Proceed to

    OK (When troubleshooting according to Problem Symptoms Table)

    A

    OK (When troubleshooting according to the DTC)

    B

    NG (w/o Magnet Clutch)

    C

    NG (w/ Magnet Clutch)

    D

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    D

    INSPECT COOLER COMPRESSOR ASSEMBLYClick here

    C
  2. INSPECT COMPRESSOR ASSEMBLY WITH PULLEY

    1. Remove the compressor assembly with pulley.

    2. Inspect the compressor assembly with pulley.

    Result

    Proceed to

    OK

    NG

    NG

    REPLACE COMPRESSOR ASSEMBLY WITH PULLEY

    OK
  3. CHECK HARNESS AND CONNECTOR (COMPRESSOR ASSEMBLY WITH PULLEY - BODY GROUND)

    1. E269947C01

      *a

      Front view of wire harness connector

      (to Compressor Assembly with Pulley)

      Disconnect the compressor assembly with pulley connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      B30-1 (SOL-) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK
  4. CHECK HARNESS AND CONNECTOR (COMPRESSOR ASSEMBLY WITH PULLEY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

    1. Disconnect the G81 air conditioning amplifier assembly connector.

    2. Disconnect the B30 compressor assembly with pulley connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G81-2 (SOL+) - B30-2 (SOL+)

      Always

      Below 1 Ω

      G81-2 (SOL+) - Body ground

      Always

      10 kΩ or higher

    Result

    Result

    Proceed to

    OK (When troubleshooting according to Problem Symptoms Table)

    A

    OK (When troubleshooting according to the DTC)

    B

    NG

    C

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. 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

    OK
  6. CHECK HARNESS AND CONNECTOR (COOLER COMPRESSOR ASSEMBLY - BODY GROUND)

    1. E269947C01

      *a

      Front view of wire harness connector

      (to Cooler Compressor Assembly)

      Disconnect the cooler compressor assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      B30-1 (SOL-) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK
  7. CHECK HARNESS AND CONNECTOR (COOLER COMPRESSOR ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

    1. Disconnect the G81 air conditioning amplifier assembly connector.

    2. Disconnect the B30 cooler compressor assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G81-2 (SOL+) - B30-2 (SOL+)

      Always

      Below 1 Ω

      G81-2 (SOL+) - Body ground

      Always

      10 kΩ or higher

    Result

    Result

    Proceed to

    OK (When troubleshooting according to Problem Symptoms Table)

    A

    OK (When troubleshooting according to the DTC)

    B

    NG

    C

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR