Dtc B1413 Evaporator Temperature Sensor Circuit

Vehicle Interior. Corolla. Zre142 Aze141
Heating Air Conditioning. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM

INSPECT EVAPORATOR TEMPERATURE SENSOR

CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - EVAPORATOR TEMPERATURE SENSOR)

DTC B1413 Evaporator Temperature Sensor Circuit


DESCRIPTION

The evaporator temperature sensor (A/C thermistor) is installed on the evaporator in the air conditioning unit. It detects the temperature of the cooled air passed through the evaporator and its signal sent to the A/C amplifier is used to control the air conditioning. The resistance of the evaporator temperature sensor (A/C thermistor) changes in accordance with the temperature of the cooled air 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 to prevent the evaporator from freezing.

DTC No.
DTC Detection Condition
Trouble Area
B1413
Open or short in evaporator temperature sensor circuit
  1. Evaporator temperature sensor
  2. Harness or connector between evaporator temperature sensor and A/C amplifier
  3. A/C amplifier

WIRING DIAGRAM


Corolla. Zre142 Aze141.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). 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. Check the value(s) by referring to the table below.

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Evaporator Fin Thermistor
    (Evap Fin Temp)
    		Evaporator fin temperature / Min.: -29.7°C (-21.46°F), Max.: 59.55°C (139.19°F)
    		Actual evaporator temperature 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" column.

    Result:

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


B
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM000001M2W05PX.html)

C
REPLACE AIR CONDITIONING AMPLIFIER (COROLLA_ZRE142 RM000002XMC01VX.html)
A


2.INSPECT EVAPORATOR TEMPERATURE SENSOR

  1. Remove the evaporator temperature sensor.



    Corolla. Zre142 Aze141.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1413 Evaporator Temperature Sensor Circuit

  1. Disconnect the connector from the evaporator temperature sensor.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E67-1 - E67-2
    		-10°C (14°F)
    		7.30 to 9.10 kΩ
    E67-1 - E67-2
    		-5°C (23°F)
    		5.65 to 6.95 kΩ
    E67-1 - E67-2
    		0°C (32°F)
    		4.40 to 5.35 kΩ
    E67-1 - E67-2
    		5°C (41°F)
    		3.40 to 4.15 kΩ
    E67-1 - E67-2
    		10°C (50°F)
    		2.70 to 3.25 kΩ
    E67-1 - E67-2
    		15°C (59°F)
    		2.14 to 2.58 kΩ
    E67-1 - E67-2
    		20°C (68°F)
    		1.71 to 2.05 kΩ
    E67-1 - E67-2
    		25°C (77°F)
    		1.38 to 1.64 kΩ
    E67-1 - E67-2
    		30°C (86°F)
    		1.11 to 1.32 kΩ
    NOTICE:
    1. Hold the sensor only by its connector. Touching the sensor may change the resistance value.
    2. When measuring, the sensor temperature must be the same as the ambient temperature.
    HINT:
    As the temperature increases, the resistance decreases (see the graph).
    Text in Illustration
    *a
    		Component without harness connected
    (Evaporator Temperature Sensor)
    *b
    		Sensing Portion
    *c
    		Resistance (kΩ)
    *d
    		Allowable Range
    *e
    		Temperature (°C (°F))


NG
REPLACE EVAPORATOR TEMPERATURE SENSOR (COROLLA_ZRE142 RM000001HLW0XJX.html)
OK


3.CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - EVAPORATOR TEMPERATURE SENSOR)

  1. Disconnect the connector from the A/C amplifier.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E62-10 (TE) - E67-1*1
    		Always
    		Below 1 Ω
    E62-11 (SG-3) - E67-2*1
    		Always
    		Below 1 Ω
    E62-10 (TE) - Body ground*1
    		Always
    		10 kΩ or higher
    E62-11 (SG-3) - Body ground*1
    		Always
    		10 kΩ or higher
    E111-22 (TE) - E67-1*2
    		Always
    		Below 1 Ω
    E111-23 (SG-3) - E67-2*2
    		Always
    		Below 1 Ω
    E111-22 (TE) - Body ground*2
    		Always
    		10 kΩ or higher
    E111-23 (SG-3) - Body ground*2
    		Always
    		10 kΩ or higher
    1. *1: except TMC Made 2AZ-FE
    2. *2: for TMC Made and except TMC Made 2ZR-FE


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER (COROLLA_ZRE142 RM000002XMC01VX.html)