Dtc B1413 Evaporator Temperature Sensor Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (NO. 1 COOLER 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 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 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 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.
  1. No. 1 cooler thermistor
  2. Air conditioning harness assembly
  3. Air conditioning amplifier assembly

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.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 (NO. 1 COOLER THERMISTOR)

  1. Use the Data List to check if the No. 1 cooler thermistor is functioning properly (LandCruiser RM000002LIV041X.html).

    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 column.
    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 (LandCruiser RM0000039R5028X.html)

C
Go to step 2
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM0000045EC00TX.html)

2.INSPECT NO. 1 COOLER THERMISTOR


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1413 Evaporator Temperature Sensor Circuit

  1. Remove the No. 1 cooler thermistor (LandCruiser RM0000017ZR08TX.html).

  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
    Text in Illustration
    *a
    		Sensing Portion
    *b
    		Resistance
    *c
    		Allowable Range
    *d
    		Temperature
    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 (refer to the graph).


NG
REPLACE NO. 1 COOLER THERMISTOR (LandCruiser RM0000017ZR08TX.html)
OK


3.INSPECT AIR CONDITIONING HARNESS ASSEMBLY


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1413 Evaporator Temperature Sensor Circuit

  1. Remove the air conditioning harness assembly (LandCruiser RM000003AXS04FX.html).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    z1-6 (TEA) - 2
    		Always
    		Below 1 Ω
    z1-5 (SGA) - 1
    		Always
    		Below 1 Ω
    z1-6 (TEA) - Body ground
    		Always
    		10 kΩ or higher
    z1-5 (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)


NG
REPLACE AIR CONDITIONING HARNESS ASSEMBLY (LandCruiser RM000003AXS04FX.html)
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (LandCruiser RM0000039R5028X.html)