AIR CONDITIONING SYSTEM, Diagnostic DTC:B14AB

DTC Code DTC Name
B14AB Heating Three-way Valve Circuit

DESCRIPTION

The electromagnetic valve of the 3-way valve is opened and closed according to air conditioning amplifier assembly control, changing the FC coolant flow modes (Independent / Intermediate / Linked).

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B14AB Heating Three-way Valve Circuit During 3 way valve operation, the heating 3-way valve operation request signal is output for 10 seconds or more, but the actual position information of the heating 3 way valve has not reached the target position.

  • 3 way valve

  • Harness or connector

  • Air conditioning amplifier assembly

Memorized

(10 seconds or more)

Tech Tips

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

WIRING DIAGRAM

A01MGSVE03
*a WVO
*b WVS
*c 3 Way Valve
*d Air Conditioning Amplifier Assembly

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Remove the air conditioning amplifier assembly with connectors still connected.

      Click here

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    5. Check the operation by referring to the table below.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Heater Valve 3 way valve Close, Half, Open -

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Heater Valve
    6. A01MJTPC12
      *a

      Component with harness connected

      (to Air Conditioning Amplifier Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G42-2 (PO1) - G42-7 (SG) Active Test "Close" 2.3 to 2.7 V
      Active Test "Half" 1.3 to 1.7 V
      Active Test "Open" 0.3 to 0.7 V
      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. CHECK HARNESS AND CONNECTOR (3 WAY VALVE - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the A23 3 way valve connector.

    2. Disconnect the G42 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
      A23-1(-) - G42-24(MP2-) Always Below 1 Ω
      A23-2(+) - G42-23(MP2+) Always Below 1 Ω
      A23-4(WVO) - G42-8(S5-1) Always Below 1 Ω
      A23-5(WVS) - G42-2(PO1) Always Below 1 Ω
      A23-6(GND) - G42-7(SG) Always Below 1 Ω
      A23-1 (-) or G42-24 (MP2-) - Body ground Always 10 kΩ or higher
      A23-2 (+) or G42-23 (MP2+) - Body ground Always 10 kΩ or higher
      A23-4 (WVO) or G42-8 (S5-1) - Body ground Always 10 kΩ or higher
      A23-5 (WVS) or G42-2 (PO1) - Body ground Always 10 kΩ or higher
      A23-6 (GND) or G42-7 (SG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK 3 WAY VALVE


    1. Replace the 3 way valve with a new or known good one.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B14AB is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (3 WAY VALVE WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here