AIR CONDITIONING SYSTEM, Diagnostic DTC:B1451/51

DTC Code DTC Name
B1451/51 Compressor Solenoid Circuit

DESCRIPTION

In this circuit, the A/C compressor receives a refrigerant compression demand signal from the A/C amplifier.

Based on this signal, the A/C compressor changes the amount of compressor output.

DTC No. DTC Detection Condition Trouble Area
B1451/51 Open or short in A/C compressor solenoid circuit

  • A/C compressor (solenoid valve)

  • Harness or connector between A/C amplifier and A/C compressor (solenoid valve)

  • A/C amplifier

WIRING DIAGRAM

A019LRZE04

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT A/C COMPRESSOR (SOLENOID VALVE)


    1. A019L8AE52
      Text in Illustration
      *1

      Component without harness connected

      (A/C Compressor (Solenoid Valve))

      Disconnect the A/C compressor (solenoid valve) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D9-2 (SOL+) - D9-1 (SOL-) 20°C (68°F) 10 to 11 Ω
      Result
      Result Proceed to
      OK A
      NG (for 2GR-FE) B
      NG (for 1AR-FE) C

    B

    REPLACE A/C COMPRESSOR (SOLENOID VALVE) Click here

    C

    REPLACE A/C COMPRESSOR (SOLENOID VALVE) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (A/C COMPRESSOR (SOLENOID VALVE) - BODY GROUND)


    1. A019P45E66
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Compressor (Solenoid Valve))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D9-1 (SOL-) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (A/C COMPRESSOR (SOLENOID VALVE) - A/C AMPLIFIER)


    1. A019L63E39

      Disconnect the A/C amplifier connector.

    2. A019P45E67
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Amplifier)
      *2

      Front view of wire harness connector

      (to A/C Compressor (Solenoid Valve))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F50-2 (SOL+) - D9-2 (SOL+) Always Below 1 Ω
      F50-2 (SOL+) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (When troubleshooting according to Problem Symptoms Table) B
      OK (When troubleshooting according to the DTC) C

    B

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

    C

    REPLACE A/C AMPLIFIER Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR