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 receives a refrigerant compression demand signal from the air conditioning amplifier.

Based on this signal, the compressor changes the degree of refrigerant compression.

DTC No. DTC Detection Condition Trouble Area
B1451/51 Open or short in solenoid of externally changeable compressor circuit

  • Air conditioning compressor

  • Harness and connector between air conditioning amplifier and air conditioning compressor

  • Air conditioning amplifier

WIRING DIAGRAM

A0119I1E15

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (REGULATOR CONTROL CURRENT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Air Conditioner / Data List.

    5. According to the display on the intelligent tester, read the Data List.

      Air Conditioner
      Tester Display Measurement Item/Display (Range) Normal Condition Diagnostic Note
      Regulator Control Current

      Regulator control current /

      Min.: 0 A

      Max.: 0.997 A

      		 Value changes between 0 A and 0.997 A in accordance with compressor and pulley operation -
      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      NG A
      OK (When troubleshooting according to the Problem Symptoms Table) B
      OK (When troubleshooting according to the DTC output) C

    B

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

    C

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    A

  2. INSPECT AIR CONDITIONING COMPRESSOR

    A01180ZE11
    Text in Illustration
    *1

    Component without harness connected

    (Air Conditioning Compressor)

    1. Disconnect the B33 air conditioning compressor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (SOL+) -2 (SOL-) 25°C (77°F) 10.1 to 11.1 Ω

    3. Reconnect the air conditioning compressor connector.

      Result
      Result Proceed to
      OK A
      NG (for 1KR-FE) B
      NG (for 1ND-TV) C

    B

    REPLACE AIR CONDITIONING COMPRESSOR Click here

    C

    REPLACE AIR CONDITIONING COMPRESSOR Click here

    A

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


    1. A0119SKE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Air Conditioning Compressor)
      *2

      Rear view of wire harness connector

      (to Air Conditioning Amplifier)

      Disconnect the B33 air conditioning compressor connector.

    2. Disconnect the D15 air conditioning amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B33-1 (SOL+) - D15-2 (SOL+) Always Below 1 Ω
      B33-1 (SOL+) - Body Ground Always 10 kΩ or higher

    4. Reconnect the air conditioning compressor connector.

    5. Reconnect the air conditioning amplifier connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING COMPRESSOR - BODY GROUND)

    A0117TYE02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Air Conditioning Compressor)

    1. Disconnect the B33 air conditioning compressor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D33-2 (SOL-) - Body Ground Always Below 1 Ω

    3. Reconnect the air conditioning compressor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER Click here