Dtc B1413 Evaporator Temperature Sensor Circuit

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Heating Air Conditioning. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (EVAPORATOR FIN THERMISTOR)

INSPECT NO. 1 COOLER THERMISTOR

INSPECT AIR CONDITIONING HARNESS ASSEMBLY

DTC B1413 Evaporator Temperature Sensor Circuit


DESCRIPTION

The No. 1 cooler thermistor is installed on the evaporator in the air conditioner unit to detect the cooled air temperature 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 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 and reads voltage changes as the resistance of the No. 1 cooler thermistor changes. This sensor is used for frost prevention.

DTC Code
DTC Detection Condition
Trouble Area
B1413
An open or short in the No. 1 cooler thermistor circuit is detected for 8.5 minutes or more.
  1. No. 1 cooler thermistor
  2. Air conditioning harness assembly
  3. Air conditioning amplifier assembly

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1413 Evaporator Temperature Sensor Circuit


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (EVAPORATOR FIN THERMISTOR)

  1. Use the Data List to check if the No. 1 cooler thermistor is functioning properly (Click here).

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Evaporator Fin Thermistor
    		No. 1 cooler thermistor /
    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.
    Result
    Result
    		Proceed to
    OK (When troubleshooting according to problem symptoms table)
    		A
    OK (When troubleshooting according to the DTC)
    		B
    NG
    		C


B
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

C
Go to step 2
A

PROCEED TO NEXT INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

2.INSPECT NO. 1 COOLER THERMISTOR
Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1413 Evaporator Temperature Sensor Circuit

  1. Remove the No. 1 cooler thermistor.

    1. for LHD: Click here.
    2. for RHD: Click here.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		-10°C (14°F)
    		7.30 to 9.10 kΩ
    -5°C (23°F)
    		5.65 to 6.95 kΩ
    0°C (32°F)
    		4.40 to 5.35 kΩ
    5°C (41°F)
    		3.40 to 4.15 kΩ
    10°C (50°F)
    		2.70 to 3.25 kΩ
    15°C (59°F)
    		2.14 to 2.58 kΩ
    20°C (68°F)
    		1.71 to 2.05 kΩ
    25°C (77°F)
    		1.38 to 1.64 kΩ
    30°C (86°F)
    		1.11 to 1.32 kΩ
    NOTICE:
    1. Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor.
    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
    		Sensor
    *b
    		Resistance
    *c
    		Allowable Range
    *d
    		Temperature
    Result
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C


B
REPLACE NO. 1 COOLER THERMISTOR (Click here)

C
REPLACE NO. 1 COOLER THERMISTOR (Click here)
A


3.INSPECT AIR CONDITIONING HARNESS ASSEMBLY


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1413 Evaporator Temperature Sensor Circuit

  1. Remove the air conditioning harness assembly.

    1. for LHD: Click here.
    2. for RHD: Click here.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    z54-6 (TEA) - 2
    		Always
    		Below 1 Ω
    z54-5 (SGA) - 1
    		Always
    		Below 1 Ω
    z54-6 (TEA) - Body ground
    		Always
    		10 kΩ or higher
    z54-5 (SGA) - Body ground
    		Always
    		10 kΩ or higher
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to No. 1 Cooler Thermistor)
    *b
    		Front view of wire harness connector
    (to Air Conditioning Amplifier Assembly)
    Result
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C


B
REPLACE AIR CONDITIONING HARNESS ASSEMBLY (Click here)

C
REPLACE AIR CONDITIONING HARNESS ASSEMBLY (Click here)
A

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)