AIR CONDITIONING SYSTEM, Diagnostic DTC:B1413/13

DTC Code DTC Name
B1413/13 Evaporator Temperature Sensor Circuit

DESCRIPTION

The evaporator temperature sensor (A/C thermistor) 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 A/C amplifier. The resistance of the evaporator temperature sensor (A/C thermistor) 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 A/C amplifier applies voltage (5 V) to the evaporator temperature sensor (A/C thermistor) and reads voltage changes as the resistance of the evaporator temperature sensor (A/C thermistor) changes. This sensor is used for frost prevention.

DTC No. DTC Detection Condition Trouble Area
B1413/13 Open or short in evaporator temperature sensor circuit

  • Air conditioning harness

  • Evaporator temperature sensor

  • A/C amplifier

WIRING DIAGRAM

A01610GE01

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Select the item below in the Data List, and read the display on the intelligent tester.

      Data List / Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note

      Evaporator Temp Sensor

      (Evap Temp)

      Evaporator temperature sensor /

      Min.: -29.7°C (-21.46°F)

      Max.: 59.55°C (139.19°F)

      		 Actual evaporator temperature is displayed

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

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

    B

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

    C

    REPLACE A/C AMPLIFIER Click here

    A

  2. INSPECT EVAPORATOR TEMPERATURE SENSOR


    1. Remove the evaporator temperature sensor.

    2. A015ZGWE02

      Disconnect the evaporator temperature sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      e2-1 - e2-2 -10°C (14°F) 7.30 to 9.10 kΩ
      e2-1 - e2-2 -5°C (23°F) 5.65 to 6.95 kΩ
      e2-1 - e2-2 0°C (32°F) 4.40 to 5.35 kΩ
      e2-1 - e2-2 5°C (41°F) 3.40 to 4.15 kΩ
      e2-1 - e2-2 10°C (50°F) 2.70 to 3.25 kΩ
      e2-1 - e2-2 15°C (59°F) 2.14 to 2.58 kΩ
      e2-1 - e2-2 20°C (68°F) 1.71 to 2.05 kΩ
      e2-1 - e2-2 25°C (77°F) 1.38 to 1.64 kΩ
      e2-1 - e2-2 30°C (86°F) 1.11 to 1.32 kΩ

      Note


      • Hold the sensor only by its connector. Touching the sensor may change the resistance value.

      • When measuring, the sensor temperature must be the same as the ambient temperature.

      Tech Tips

      As the temperature increases, the resistance decreases (see the graph).


    NG

    REPLACE EVAPORATOR TEMPERATURE SENSOR Click here

    OK

  3. INSPECT AIR CONDITIONING HARNESS (A/C AMPLIFIER - EVAPORATOR TEMPERATURE SENSOR)


    1. Remove the air conditioning harness.


      1. Disconnect the A/C amplifier connector.

        A015ZR3E01
    2. A01614UE16

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      e1-6 (TE) - e2-2 Always Below 1 Ω
      e1-5 (SG) - e2-1 Always Below 1 Ω
      e1-6 (TE) - Body ground Always 10 kΩ or higher
      e1-5 (SG) - Body ground Always 10 kΩ or higher

    NG

    REPLACE AIR CONDITIONING HARNESS Click here

    OK

    REPLACE A/C AMPLIFIER Click here