AIR CONDITIONING SYSTEM(for Manual Air Conditioning System), Diagnostic DTC:B1451

DTC Code DTC Name
B1451 Compressor Solenoid Circuit

DESCRIPTION

In this circuit, the compressor assembly with pulley (compressor solenoid) receives refrigerant compression demand signals from the air conditioning amplifier assembly.

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

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

  • Compressor assembly with pulley (compressor solenoid)

  • Harness or connector

  • Air conditioning amplifier assembly

 -

WIRING DIAGRAM


  1. for 2AR-FE

    B006XFQE06
    *a Compressor Assembly with Pulley (Compressor Solenoid)
    *b Air Conditioning Amplifier Assembly

  2. for A25A-FKS

    B006XFQE01
    *a Compressor Assembly with Pulley (Compressor Solenoid)
    *b Air Conditioning Amplifier Assembly

PROCEDURE


  1. CONFIRM MODEL

    Result
    Result Proceed to
    for 2AR-FE A
    for A25A-FKS B

    B

    INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

  2. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

    B006YC1C07
    *a

    Front view of wire harness connector

    (to Compressor Assembly with Pulley (Compressor Solenoid))

    1. Disconnect the C62 compressor assembly with pulley (compressor solenoid) connector.

    2. Using an oscilloscope, check the waveform.

      Item Content
      Terminal No. C62-2 (SOL+) - Body ground
      Tool Setting 5 V/DIV., 500 μs./DIV.
      Condition

      • Engine running

      • Blower switch: LO

      • A/C switch: On
      OK
      Waveform is similar to that shown in the illustration.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMPRESSOR ASSEMBLY WITH PULLEY (COMPRESSOR SOLENOID) Click here

    NG

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


    1. Disconnect the K54 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
      C62-2 (SOL+) - K54-3 (SOL+) Always Below 1 Ω
      C62-2 (SOL+) or K54-3 (SOL+) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

    B006YC1C02
    *a

    Front view of wire harness connector

    (to Compressor Assembly with Pulley (Compressor Solenoid))

    1. Disconnect the C98 compressor assembly with pulley (compressor solenoid) connector.

    2. Using an oscilloscope, check the waveform.

      Item Content
      Terminal No. C98-2 (SOL+) - Body ground
      Tool Setting 5 V/DIV., 500 μs./DIV.
      Condition

      • Engine running

      • Blower switch: LO

      • A/C switch: On
      OK
      Waveform is similar to that shown in the illustration.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMPRESSOR ASSEMBLY WITH PULLEY (COMPRESSOR SOLENOID) Click here

    NG

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


    1. Disconnect the K54 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
      C98-2 (SOL+) - K54-3 (SOL+) Always Below 1 Ω
      C98-2 (SOL+) or K54-3 (SOL+) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR