AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B1413/13

DTC Code DTC Name
B1413/13 Evaporator Temperature Sensor Circuit

DESCRIPTION

The No. 1 cooler evaporator sub-assembly is installed on the evaporator in the air conditioner unit to detect the temperature of the air that has passed through the evaporator and is used to control the air conditioning. It sends signals to the air conditioning amplifier assembly. The resistance of the No. 1 cooler evaporator sub-assembly changes in accordance with the cooled air temperature that has passed through the evaporator. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (5 V) to the No. 1 cooler evaporator sub-assembly and reads voltage changes as the resistance of the No. 1 cooler evaporator sub-assembly changes. This sensor is used for frost prevention.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

B1413/13

Evaporator Temperature Sensor Circuit

Open or short in No. 1 cooler evaporator sub-assembly circuit

  • No. 1 cooler evaporator sub-assembly

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

Memorized (4 seconds or more)

-
Tip:

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

WIRING DIAGRAM

E229251E33

PROCEDURE

  1. READ VALUE USING GTS

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    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

      Evaporator Fin Thermistor

      No. 1 cooler evaporator sub-assembly

      Min.: -29.70°C (-21.46°F)

      Max.: 59.55°C (139.19°F)

      Actual evaporator temperature displayed

      -

      Body Electrical > Air Conditioner > Data List

      Tester Display

      Evaporator Fin Thermistor

      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 hereClick hereClick here

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here

    C

  2. INSPECT NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY

    1. Remove the No. 1 cooler evaporator sub-assembly.

      Click here

    2. Inspect the No. 1 cooler evaporator sub-assembly.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY (NO. 1 COOLER THERMISTOR)

    Click here

    OK

  3. CHECK AIR CONDITIONING HARNESS ASSEMBLY

    1. E269945C01

      *a

      Front view of air conditioning harness assembly

      (to Air Conditioning Amplifier Assembly)

      *b

      Front view of air conditioning harness assembly

      (to No. 1 Cooler Evaporator Sub-assembly)

      Disconnect the air conditioning harness assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      z7-6 (TEA) - aa1-2

      Always

      Below 1 Ω

      z7-5 (SGA) - aa1-1

      Always

      Below 1 Ω

      z7-6 (TEA) - Body ground

      Always

      10 kΩ or higher

      z7-5 (SGA) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here

    NG

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY

    Click hereClick hereClick hereClick here