Dtc B1413 Evaporator Temperature Sensor Circuit

Vehicle Interior. Yaris. Ncp93, 131
Heating Air Conditioning. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM

CHECK FOR DTC

INSPECT NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR)

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

DTC B1413 Evaporator Temperature Sensor Circuit


DESCRIPTION

The No. 1 cooler thermistor (evaporator temperature sensor) is installed on the evaporator in the air conditioning unit to detect the temperature of the cooled air 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 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.
DTC Detection Condition
Trouble Area
B1413
An open or short in the No. 1 cooler thermistor (evaporator temperature sensor) circuit.
  1. No. 1 cooler thermistor (evaporator temperature sensor)
  2. Harness or connector
  3. Air conditioning amplifier assembly

WIRING DIAGRAM


Yaris. Ncp93, 131.Heating Air Conditioning.Air Conditioning System (For Sedan). Dtc B1413 Evaporator Temperature Sensor Circuit


INSPECTION PROCEDURE

1.READ VALUE USING TECHSTREAM

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Body Electrical / Air Conditioner / Data List.

  1. According to the display on the Techstream, read the Data List.

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Evaporator Fin Thermistor
    		Evaporator temperature sensor/
    Min.: -29.7°C (-21.46°F)
    Max.: 59.55°C (139.19°F)
    		Actual evaporator temperature displayed
    		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 column.
    Result
    Result
    		Proceed to
    OK (When troubleshooting according to the DTC)
    		A
    OK (When troubleshooting according to Problem Symptoms Table)
    		B
    NG
    		C


B
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (YARIS_NCP93 RM000001M2W05EX.html)

C
Go to step 3
A


2.CHECK FOR DTC

  1. Clear the DTCs (YARIS_NCP93 RM000001GUF06ZX.html).

  1. Check for DTCs (YARIS_NCP93 RM000001GUF06ZX.html).

    OK:
    DTC B1413 is not output


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (YARIS_NCP93 RM00000214000EX.html)
OK

USE SIMULATION METHOD TO CHECK (YARIS_NCP93 RM000000UZ309WX.html)

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

  1. Inspect the No. 1 cooler thermistor (evaporator temperature sensor) (YARIS_NCP93 RM000000VTW035X.html).



NG
REPLACE NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR) (YARIS_NCP93 RM000004O4B004X.html)
OK


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

  1. Disconnect the D123 No. 1 cooler thermistor (evaporator temperature sensor) connector.

  1. Disconnect the D130 air conditioning amplifier assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D123-2 - D130-4 (TE)
    		Always
    		Below 1 Ω
    D123-1 - D130-15 (SG-1)
    		Always
    		Below 1 Ω
    D123-2 - Body ground
    		Always
    		10 kΩ or higher
    D123-1 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (YARIS_NCP93 RM00000214000EX.html)