AIR CONDITIONING SYSTEM(for Manual Air Conditioning System), Diagnostic DTC:B1413

DTC Code DTC Name
B1413 Evaporator Temperature Circuit or Evaporator Fin Thermistor

DESCRIPTION

The No. 1 cooler thermistor is installed to the evaporator in the air conditioner unit to detect the temperature of the cooled air that has passed through the evaporator, which is used to control the air conditioning system. It sends signals to the air conditioning amplifier assembly. The resistance of the No. 1 cooler thermistor changes in accordance with the temperature of the cooled air 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 thermistor and reads voltage changes as the resistance of the No. 1 cooler thermistor changes. This sensor is used for frost prevention.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1413 Evaporator Temperature Circuit or Evaporator Fin Thermistor Open or short in evaporator temperature sensor circuit

  • No. 1 cooler thermistor

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

Memorized

(4 sec. or more)*

WIRING DIAGRAM

B0071JGE23

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. Read the Data List according to the display on the GTS.


      Body Electrical > Air Conditioner > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Evaporator Fin Thermistor No. 1 cooler thermistor

      Min.: -29.70°C (-21.46°F)

      Max.: 59.55°C (139.19°F)

      		 Actual evaporator temperature displayed

      No. 1 cooler thermistor circuit malfunction


      • When open circuit: -29.70°C (-21.46°F)

      • When short circuit: 59.55°C (139.19°F)

      Body Electrical > Air Conditioner > Data List
      Tester Display
      Evaporator Fin Thermistor
      OK
      The display is as specified in the normal condition column.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

  2. INSPECT NO. 1 COOLER THERMISTOR


    1. Remove the No. 1 cooler thermistor.

      Click here

    2. Inspect the No. 1 cooler thermistor.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 COOLER THERMISTOR Click here

    OK

  3. INSPECT AIR CONDITIONING HARNESS ASSEMBLY

    B0071GCC01
    *a

    Front view of wire harness connector

    (to Air Conditioning Amplifier Assembly)

    		 *b

    Front view of wire harness connector

    (to No. 1 Cooler Thermistor)

    1. Remove the air conditioning harness assembly.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z8-5 (SG) - C-2 Always Below 1 Ω
      z8-6 (TE) - C-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here