AIR CONDITIONING SYSTEM, Diagnostic DTC:B1451/51

DTC Code DTC Name
B1451/51 Compressor Solenoid Circuit

DESCRIPTION

In this circuit, the cooler compressor assembly receives a refrigerant compression demand signal from the air conditioning amplifier assembly. the solenoid valve is installed in the cooler compressor assembly.

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

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

  • Cooler compressor assembly

  • Harness or connector

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01FDSAE16

INSPECTION PROCEDURE

Note


  • When the battery is disconnected or the air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization Click here.

  • Before disconnecting the cable form the negative (-) battery terminal or replacing the air conditioning amplifier assembly, record the last operation state of the air conditioning for each transmitter. After replacement, it is necessary to perform memory registration for each transmitter Click here.

PROCEDURE


  1. READ VALUE USING GTS (REGULAR CONTROL CURRENT)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Data List Click here.

    5. Check the value(s) by referring to the table below.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Regular Control Current

      Solenoid valve control current /

      Min.: 0 A, Max.: 0.997 A

      		 Value Changes between 0 A and 0.997 A in accordance with solenoid valve operation -
      OK
      The display is as specified in the normal condition column.
      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 AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

  2. INSPECT COOLER COMPRESSOR ASSEMBLY


    1. Remove the cooler compressor assembly.


    2. Inspect the cooler compressor assembly.


      Result
      Result Proceed to
      OK A
      NG (for 2WD) B
      NG (for AWD) C

    B

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    C

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    A

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


    1. A01FE9AE03
      Text in Illustration
      *a

      Front view of harness connector

      (to Cooler Compressor Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F20-6 (SOL-) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (COOLER COMPRESSOR ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the N79 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
      N79-4 (SOL+) - F20-3 (SOL+) Always Below 1 Ω
      N79-4 (SOL+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here