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 (compressor solenoid) receives a refrigerant compression demand signal from the air conditioning amplifier assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1451/51 Compressor Solenoid Circuit Open or short in compressor solenoid circuit

  • Compressor assembly with pulley (compressor solenoid)

  • Harness or connector between air conditioning amplifier assembly and compressor assembly with pulley (compressor solenoid)

  • Air conditioning amplifier assembly

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WIRING DIAGRAM

B006812E57
*a Compressor Assembly with Pulley (Compressor Solenoid)
*b Air Conditioning Amplifier Assembly

PROCEDURE


  1. INSPECT COMPRESSOR ASSEMBLY WITH PULLEY (COMPRESSOR SOLENOID)


    1. B0067FZC15
      *a

      Component without harness connected

      (Compressor Assembly with Pulley (Compressor Solenoid))

      Disconnect the compressor assembly with pulley (compressor solenoid) 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
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMPRESSOR ASSEMBLY WITH PULLEY (COMPRESSOR SOLENOID) Click here

    OK

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


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F11-1 (SOL-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the O9 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F11-2 (SOL+) - O9-4 (SOL+) Always Below 1 Ω
      F11-2 (SOL+) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (When troubleshooting according to the Problem Symptoms Table) B
      OK (When troubleshooting according to the DTC) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

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

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here