Dtc B1417 Evaporator Temperature Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (REAR EVAPORATOR TEMPERATURE SENSOR)

INSPECT NO. 2 AIR CONDITIONING HARNESS ASSEMBLY (REAR EVAPORATOR TEMPERATURE SENSOR)

CHECK HARNESS AND CONNECTOR (REAR EVAPORATOR TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER)

DTC B1417 Evaporator Temperature Circuit


DESCRIPTION

The No. 2 air conditioning harness assembly (rear evaporator temperature sensor) is installed on the evaporator in the rear air conditioning unit to detect the cooled air temperature that has passed through the evaporator and to control the rear air conditioning. It sends signals to the air conditioning amplifier assembly. The signals change in accordance with the resistance of the No. 2 air conditioning harness assembly (rear evaporator temperature sensor). As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases. The air conditioning amplifier assembly applies a voltage (5 V) to the No. 2 air conditioning harness assembly (rear evaporator temperature sensor) and reads voltage changes as the resistance of the No. 2 air conditioning harness assembly (rear evaporator temperature sensor) changes. This sensor is used for frost prevention.

DTC Code
DTC Detection Condition
Trouble Area
B1417
Open or short in the No. 2 air conditioning harness assembly (rear evaporator temperature sensor) circuit.
  1. No. 2 air conditioning harness assembly (rear evaporator temperature sensor)
  2. Harness or connector
  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 B1417 Evaporator Temperature Circuit


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (REAR EVAPORATOR TEMPERATURE SENSOR)

  1. Use the Data List to check if the rear evaporator temperature sensor is functioning properly (LandCruiser RM000002LIV041X.html).

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Ambient Temp Sens (Rear)
    		Rear evaporator temperature sensor /
    Min.: -29.7°C (-21.46°F)
    Max.: 59.55°C (139.19°F)
    		Actual rear 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. 2 AIR CONDITIONING HARNESS ASSEMBLY (REAR EVAPORATOR TEMPERATURE SENSOR)


    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 B1417 Evaporator Temperature Circuit

  1. Remove the No. 2 air conditioning harness assembly (rear evaporator temperature sensor) (LandCruiser RM000003A3Q03JX.html).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    7 (-) - 8 (+)
    		-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. 2 AIR CONDITIONING HARNESS ASSEMBLY (REAR EVAPORATOR TEMPERATURE SENSOR) (LandCruiser RM000003A3Q03JX.html)
OK


3.CHECK HARNESS AND CONNECTOR (REAR EVAPORATOR TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER)

  1. Disconnect the Q13 harness connector.

  1. Disconnect the G24 amplifier connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Q13-8 (+) - G24-4 (TEC)
    		Always
    		Below 1 Ω
    Q13-7 (-) - G24-19 (SGND)
    		Always
    		Below 1 Ω
    Q13-8 (+) - Body ground
    		Always
    		10 kΩ or higher
    Q13-7 (-) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (LandCruiser RM0000039R5028X.html)