AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System with Side-mounted Air Conditioner Pressure Sensor), Diagnostic DTC:B1451

DTC Code DTC Name
B1451 Compressor Solenoid Circuit

DESCRIPTION

In this circuit, the cooler compressor assembly (compressor solenoid) receives a refrigerant compression demand signal from the air conditioning amplifier assembly.

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

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1451 Compressor Solenoid Circuit

Any of the following conditions is met:


  • Open in compressor solenoid circuit

  • Short in compressor solenoid circuit

  • Compressor with pulley assembly (compressor solenoid)

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

  • Air conditioning amplifier assembly

 -
DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Ignition switch ON ○ ○
Malfunction Status Open in compressor solenoid circuit ○ -
Short in compressor solenoid circuit - ○
Detection Time 30 seconds or more 30 seconds or more
Number of Trips 1 trip 1 trip

Tech Tips

The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

WIRING DIAGRAM

A001T5OE10
*a Compressor with Pulley Assembly (Compressor Solenoid)
*b Air Conditioning Amplifier Assembly

PROCEDURE


  1. INSPECT COMPRESSOR WITH PULLEY ASSEMBLY (COMPRESSOR SOLENOID)


    1. A001VTYC15
      *a

      Component without harness connected

      (Cooler Compressor Assembly (Compressor Solenoid))

      Disconnect the C71 cooler compressor assembly (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 WITH PULLEY ASSEMBLY (COMPRESSOR SOLENOID) Click here

    OK

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


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C71-1 (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 (COOLER COMPRESSOR ASSEMBLY (COMPRESSOR SOLENOID) - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the F73 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
      C71-2 (SOL+) - F73-3 (SOL+) Always Below 1 Ω
      C71-2 (SOL+) or F73-3 (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

  4. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here