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

DTC Code DTC Name
B1451 Compressor Solenoid Circuit

DESCRIPTION

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

Based on this signal, the compressor with pulley 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

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

A001X4BE03
*a from IG1-NO. 1 Relay
*b ECU-IG1 NO. 4
*c Compressor with Pulley Assembly (Compressor Solenoid)
*d Air Conditioning Amplifier Assembly

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. INSPECT COMPRESSOR WITH PULLEY ASSEMBLY (COMPRESSOR SOLENOID)


    1. Remove the compressor with pulley assembly (compressor solenoid).

      Click here

    2. Inspect the compressor with pulley assembly (compressor solenoid).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMPRESSOR WITH PULLEY ASSEMBLY (COMPRESSOR SOLENOID) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH PULLEY ASSEMBLY (COMPRESSOR SOLENOID) - POWER SOURCE)


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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      C33-2 (SOL+) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the F72 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
      C33-1 (SOL-) - F72-15 (SOL-) Always Below 1 Ω
      C33-1 (SOL-) or F72-15 (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