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 changes. This sensor is used for frost prevention.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1413/13 Evaporator Temperature Sensor Circuit

Any of the following conditions is met:


  • Open in No. 1 cooler thermistor (evaporator temperature sensor) circuit

  • 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 brackets.

DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Engine switch to on (IG) ○ ○
Malfunction Status Open in No. 1 cooler thermistor (evaporator temperature sensor) circuit ○ -
Short in No. 1 cooler thermistor (evaporator temperature sensor) circuit - ○
Detection Time 4 seconds or more 4 seconds or more
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

B002EZXE06
*a ae
*b Air Conditioning Harness Assembly
*c No. 1 Cooler Thermistor (Evaporator Temperature Sensor)
*d Air Conditioning Amplifier Assembly

CAUTION / NOTICE / HINT

Note

Before disconnecting the cable from the negative (-) battery terminal or replacing the air conditioning amplifier assembly, record the last operation state of the air conditioning for each transmitter. After replacement, it is necessary to perform memory registration for each transmitter.

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch to on (IG).

    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 -

      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 Problem Symptoms Table) A
      OK (When troubleshooting according to the DTC) B
      NG C

    A

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

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 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

      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  3. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. B002EG7C02
      *1 Air Conditioning Harness Assembly
      *a

      Front view of air conditioning harness assembly

      (to No. 1 Cooler Thermistor (Evaporator Temperature Sensor))
      *b

      Front view of air conditioning harness assembly

      (to Air Conditioning Amplifier Assembly)

      Disconnect the air conditioning harness assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z1-11 (TEA) - ae-1 Always Below 1 Ω
      z1-12 (SGA) - ae-2 Always Below 1 Ω
      z1-11 (TEA) or ae-1 - Body ground Always 10 kΩ or higher
      z1-12 (SGA) or ae-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here