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

  • Compressor and pulley

  • Harness and connector air conditioning amplifier and compressor and pulley

  • Air conditioning amplifier

WIRING DIAGRAM

A001CZJE39
*a Compressor and Pulley
*b Air Conditioning Amplifier

PROCEDURE


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


    1. Use the Data List to check if the refrigerant control current is functioning properly.

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

      Refrigerant control current /

      Min.: 0 A

      Max.: 0.997 A

      		 Value changes between 0 A and 0.997 A in accordance with compressor and magnetic clutch operation -
      OK
      The display is as specified in the normal condition.
      Result
      Result Proceed to
      NG A
      OK (Checking from the PROBLEM SYMPTOMS TABLE) B
      OK (Checking from the DTC) C

    B

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    A

  2. INSPECT COMPRESSOR AND PULLEY

    A001BUEE09
    *1 Component without harness connected: (Compressor and Pulley)

    1. Disconnect the compressor and pulley connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      1 - 2 25°C (77°F) 10.1 to 11.1 Ω
      Result
      Result Proceed to
      OK A
      NG (for 2WD) B
      NG (for AWD) C

    B

    REPLACE COMPRESSOR AND PULLEY Click here

    C

    REPLACE COMPRESSOR AND PULLEY Click here

    A

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

    A001A7GE01
    *1 Front view of wire harness connector: (to Compressor and Pulley)
    *2 Rear view of wire harness connector: (to Air Conditioning Amplifier)

    1. Disconnect the E11 compressor and pulley connector.

    2. Disconnect the L76 amplifier connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E11-2 (SOL+) - L76-4 (SOL+) Always Below 1 Ω
      E11-2 (SOL+) - Body Ground Always 1 MΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    A00194NE01
    *1 Front view of wire harness connector: (to Compressor and Pulley)

    1. Disconnect the E11 compressor and pulley connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E11-1 (SOL-) - Body Ground Always Below 1 Ω

    OK

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR