AIR CONDITIONING SYSTEM(for Manual 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 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 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 No. Detection Item DTC Detection Condition Trouble Area Memory Note
B1413/13 Evaporator Temperature Sensor Circuit Open or short in No. 1 cooler thermistor (evaporator temperature sensor) circuit

  • No. 1 cooler thermistor (evaporator temperature sensor)

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

 Memorized (4 seconds or more) -

Tech Tips

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

WIRING DIAGRAM

B0028G2E02
*a No. 1 Cooler Thermistor (Evaporator Temperature Sensor)
*b Air Conditioning Amplifier Assembly

PROCEDURE


  1. READ VALUE USING GTS (EVAPORATOR FIN THERMISTOR)


    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 thermistor (evaporator temperature sensor)

      Min.: -29.70°C (-21.46°F)

      Max.: 59.55°C (139.19°F)

      		 Actual evaporator temperature displayed

      No. 1 cooler thermistor (evaporator temperature sensor) system 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
      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 AMPLIFIER ASSEMBLY Click here

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

  2. INSPECT NO. 1 COOLER THERMISTOR


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

      Click here

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - NO. 1 COOLER THERMISTOR [EVAPORATOR TEMPERATURE SENSOR])


    1. Remove the G77 air conditioning amplifier assembly connector.

    2. Disconnect the G25 No. 1 cooler thermistor (evaporator temperature sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G77-4 (TE) - G25-1 Always Below 1 Ω
      G77-5 (SG-2) - G25-2 Always Below 1 Ω
      G25-1 - G25-2 Always 10 kΩ or higher
      G77-4 (TE) or G25-1 - Body ground Always 10 kΩ or higher
      G77-5 (SG-2) or G25-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR