AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System with Side-mounted Air Conditioner Pressure Sensor), Diagnostic DTC:B1413

DTC Code DTC Name
B1413 Evaporator Temperature Sensor Circuit

DESCRIPTION

The No. 1 cooler thermistor (evaporator temperature sensor) 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 (evaporator temperature sensor) 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 (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
B1413 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)*

DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Ignition switch ON ○ ○
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

A001SM4E18
*a ev
*b Air Conditioning Harness Assembly
*c No. 1 Cooler Thermistor (Evaporator Temperature Sensor)
*d Air Conditioning Amplifier Assembly

PROCEDURE


  1. READ VALUE USING GTS


    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. Read the Data List according to the display on the GTS.


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

    B

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

    C

    CHECK FOR DTC Click here

    A

  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. INSPECT AIR CONDITIONING HARNESS ASSEMBLY


    1. Remove the air conditioning harness assembly.

      Click here

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

      A001WCSC03
      *1 Air Conditioning Harness Assembly - -
      *a

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      		 *b

      Front view of wire harness connector

      (to No. 1 Cooler Thermistor (Evaporator Temperature Sensor))
      Standard Resistance
      Tester Connection Condition Specified Condition
      m1-5 (SG-3) - ev-2 Always Below 1 Ω
      m1-6 (TE) - ev-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

  4. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here