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AIR CONDITIONING SYSTEM, Diagnostic DTC:B1413

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DTC Code DTC Name
B1413 Evaporator Temperature Sensor Circuit
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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 Sensor Circuit

  • Diagnosis condition: None

  • Malfunction status: Open or short in evaporator temperature sensor circuit

  • Detection time: None (Present malfunction), continuously for 4 seconds or more (Past malfunction)

  • No. 1 cooler thermistor

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

 Memorized
Table 1. *a Air Conditioning Harness Assembly *b No. 1 Cooler Thermistor *c Air Conditioning Amplifier Assembly
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WIRING DIAGRAM

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PROCEDURE


  1. Click here

    READ VALUE USING GTS (EVAPORATOR FIN THERMISTOR)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    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.


      1. 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 system malfunction


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

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



      1. 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

  2. Click here

    INSPECT NO. 1 COOLER THERMISTOR


    1. Remove the No. 1 cooler thermistor.

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    2. Inspect the No. 1 cooler thermistor.

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      Result
      Proceed to
      OK
      NG

  3. Click here

    CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. B004S2EC02
      *1 Air Conditioning Harness Assembly - -

      Remove the air conditioning harness assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z11-11 (TEA) - 2 Always Below 1 Ω
      z11-12 (SGA) - 1 Always Below 1 Ω
      z11-11 (TEA) or 2 - Other terminals and body ground Always 10 kΩ or higher
      z11-12 (SGA) or 1 - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

    • NG

      REPLACE AIR CONDITIONING HARNESS ASSEMBLYClick here