AIR CONDITIONING SYSTEM, Diagnostic DTC:B1413/13

DTC Code DTC Name
B1413/13 Evaporator Temperature Sensor Circuit

DESCRIPTION

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

DTC Code DTC Detection Condition Trouble Area
B1413/13 An open or short in the No. 1 cooler thermistor (evaporator temperature sensor) circuit.

  • No. 1 cooler thermistor (evaporator temperature sensor)

  • Air conditioning harness assembly (No. 1 cooler thermistor)

  • Air conditioning amplifier assembly

WIRING DIAGRAM

B0019ZLE21
*a Air Conditioning Harness Assembly
*b No. 1 Cooler Thermistor (Evaporator Temperature Sensor)
*c Air Conditioning Amplifier Assembly

PROCEDURE


  1. READ VALUE USING GTS (EVAPORATOR FIN THERMISTOR)


    1. Use the Data List to check if the No. 1 cooler thermistor (evaporator temperature sensor) is functioning properly Click here

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Evaporator Fin Thermistor No. 1 cooler thermistor / Min.: -29.7°C (-21.46°F), Max.: 59.55°C (139.19°F) Actual evaporator temperature displayed

      No. 1 cooler thermistor (evaporator temperature sensor) system malfunction:


      • Open in the circuit: -29.7°C (-21.46°F)

      • Short in the circuit: 59.55°C (139.19°F)
      OK
      The display is as specified in the normal condition.
      Result
      Result Proceed to
      OK (When troubleshooting according to the DTC) A
      OK (When troubleshooting according to Problem Symptoms Table) B
      NG C

    A

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    B

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

  2. INSPECT NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR)


    1. Remove the No. 1 cooler thermistor (evaporator temperature sensor) Click here.

    2. Inspect the No. 1 cooler thermistor (evaporator temperature sensor) Click here.


    NG

    REPLACE NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR) Click here

    OK

  3. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. B001AJDE01
      Text in Illustration
      *a Air Conditioning Harness Assembly
      *b to No. 1 Cooler Thermistor (Evaporator Temperature Sensor) Connector
      *c

      Front view of air conditioning harness assembly

      (to No. 1 Cooler Thermistor [Evaporator Temperature Sensor])
      *d

      Front view of air conditioning harness assembly

      (to Air Conditioning Amplifier Assembly)

      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
      1 - z66-12 (SG) Always Below 1 Ω
      2 - z66-11 (TE) Always Below 1 Ω
      1 - 2 Always 10 kΩ or higher
      1 or z66-12 (SG) - Body ground Always 10 kΩ or higher
      2 or z66-11 (TE) - Body ground Always 10 kΩ or higher

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here