AIR CONDITIONING SYSTEM, Diagnostic DTC:B1451/51

DTC Code DTC Name
B1451/51 Compressor Solenoid Circuit

DESCRIPTION


DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1451/51 Compressor Solenoid Circuit

Any of the following conditions is met:


  • Open in compressor solenoid circuit

  • Short in compressor solenoid circuit

  • Compressor with pulley assembly

  • Harness or connector

  • Air conditioning amplifier assembly

 -
DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Engine switch to on (IG) ○ ○
Malfunction Status Open in compressor solenoid circuit ○ -
Short in compressor solenoid circuit - ○
Detection Time - -
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

A01QB34E02
*a Compressor with Pulley Assembly
*b Air Conditioning Amplifier Assembly

CAUTION / NOTICE / HINT

Note

Before disconnecting the cable from 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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch to on (IG).

    3. Turn the GTS on.

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

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


      Body Electrical > Air Conditioner > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Regulator 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 -

      Body Electrical > Air Conditioner > Data List
      Tester Display
      Regulator Control Current
      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      OK (When troubleshooting according to Problem Symptoms Table) A
      OK (When troubleshooting according to the DTC) B
      NG C

    A

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

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

  2. INSPECT COMPRESSOR WITH PULLEY ASSEMBLY


    1. Remove the compressor with pulley assembly.

      Click here

    2. Inspect the compressor with pulley assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMPRESSOR WITH PULLEY ASSEMBLY Click here

    OK

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


    1. Disconnect the E10 compressor with pulley assembly connector.

    2. Disconnect the K64 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E10-2 (SOL+) - K64-4 (SOL+) Always Below 1 Ω
      E10-1 (SOL-)- Body ground Always Below 1 Ω
      E10-2 (SOL+) or K64-4 (SOL+) - 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