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

Based on this signal, the compressor with pulley assembly changes the amount of compressor output.

DTC No. DTC Detection Condition Trouble Area
B1451/51 An open or short in the cooler compressor solenoid circuit.

  • Compressor with pulley assembly

  • Harness or connector

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A0048U2E02
*a Compressor with Pulley Assembly
*b Air Conditioning Amplifier Assembly

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    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/Range Normal Condition Diagnostic Note
      Regulator Control Current

      Regulator control current /

      Min.: 0 A

      Max.: 0.997 A

      		 Value changes between 0.12 A and 0.997 A in accordance with compressor and magnetic clutch operation -
      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      OK (When troubleshooting according to the DTC) A
      OK (When troubleshooting according to Problem Symptoms Table) B
      NG C

    B

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

    C

    INSPECT COMPRESSOR WITH PULLEY ASSEMBLY Click here

    A

  2. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      B1451/51 is not output

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  3. INSPECT COMPRESSOR WITH PULLEY ASSEMBLY


    1. Inspect the compressor with pulley assembly.


      Result
      Result Proceed to
      OK A
      NG (for 1KR-FE) B
      NG (for 2NR-FKE) C
      NG (for 1ND-TV) D

    B

    REPLACE COMPRESSOR WITH PULLEY ASSEMBLY Click here

    C

    REPLACE COMPRESSOR WITH PULLEY ASSEMBLY Click here

    D

    REPLACE COMPRESSOR WITH PULLEY ASSEMBLY Click here

    A

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


    1. Disconnect the B77 compressor with pulley assembly connector.

    2. Disconnect the F42 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B77-2 (SOL+) - F42-2 (SOL+) Always Below 1 Ω
      B77-2 (SOL+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A004ADCC01
      *a

      Front view of wire harness connector

      (to Compressor with Pulley Assembly)

      Disconnect the B77 compressor with pulley assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B77-1 (SOL-) - Body ground Always Below 1 Ω

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR