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 receives a refrigerant compression demand signal from the air conditioning amplifier assembly. Based on this signal, the compressor assembly with pulley changes the degree of refrigerant compression.

DTC Code DTC Detection Condition Trouble Area
B1451/51 Open or short in the externally changeable compressor assembly with pulley solenoid circuit

  • Compressor assembly with pulley

  • Harness and connector

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A004U5KE16
*a Compressor Assembly with Pulley
*b Air Conditioning Amplifier Assembly

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (COMPRESSOR ASSEMBLY WITH PULLEY)


    1. Use the Data List to check if the compressor assembly with pulley is functioning properly.

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

      Compressor assembly with pulley /

      0: Min., 0.997: Max.

      		 Value changes between 0 A and 0.997 A in accordance with compressor assembly with pulley operation -
      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 C

    A

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

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

  2. INSPECT COMPRESSOR ASSEMBLY WITH PULLEY

    A004RJNE01
    Text in Illustration
    *1

    Component without harness connected

    (Compressor Assembly with Pulley)

    1. Remove the compressor assembly with pulley Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (SOL+) - 1 (SOL-) 20°C (68°F) 10 to 11 Ω

    NG

    REPLACE COMPRESSOR ASSEMBLY WITH PULLEY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (COMPRESSOR - BODY GROUND)


    1. A004S2HE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Compressor Assembly with Pulley)

      Disconnect the B8 compressor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B8-1 (SOL-) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the B8 compressor connector.

      A004TH7E01

    2. Disconnect the D47 amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D47-2 (SOL+) - B8-2 (SOL+) Always Below 1 Ω
      D47-2 (SOL+) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Compressor Assembly with Pulley)
      *2

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR