Dtc 11 Room Temperature Sensor Circuit

Vehicle Interior. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
Heating Air Conditioning. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT COOLER THERMISTOR

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - COOLER THERMISTOR)

DTC 11 Room Temperature Sensor Circuit


DESCRIPTION

The cooler thermistor is installed in the instrument panel to detect the room temperature and control the heater and air conditioning AUTO function. The resistance of the cooler thermistor changes in accordance with the room temperature. 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 cooler thermistor and reads voltage changes as the resistance of the cooler thermistor changes.

DTC Code
DTC Detection Condition
Trouble Area
11
An open or short in the room temperature sensor circuit.
  1. Cooler thermistor
  2. Air conditioning amplifier assembly
  3. Harness or connector

WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc 11 Room Temperature Sensor Circuit


INSPECTION PROCEDURE

1.INSPECT COOLER THERMISTOR


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc 11 Room Temperature Sensor Circuit

  1. Remove the cooler thermistor (HILUX_TGN26 RM000001G9F01CX.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 (50°F)
    		3.00 to 3.73 kΩ
    15°C (59°F)
    		2.45 to 2.88 kΩ
    20°C (68°F)
    		1.95 to 2.30 kΩ
    25°C (77°F)
    		1.60 to 1.80 kΩ
    30°C (86°F)
    		1.28 to 1.47 kΩ
    35°C (95°F)
    		1.00 to 1.22 kΩ
    40°C (104°F)
    		0.80 to 1.00 kΩ
    45°C (113°F)
    		0.65 to 0.85 kΩ
    50°C (122°F)
    		0.50 to 0.70 kΩ
    55°C (131°F)
    		0.44 to 0.60 kΩ
    60°C (140°F)
    		0.36 to 0.50 kΩ
    Text in Illustration
    *a
    		Resistance (kΩ)
    *b
    		Temperature
    NOTICE:
    1. Even slightly touching the thermistor may change the resistance value. Be sure to hold the connector of the thermistor.
    2. When measuring the resistance, the thermistor temperature must be the same as the ambient temperature.
    HINT:
    As the temperature increases, the resistance decreases (Refer to the graph).


NG
REPLACE COOLER THERMISTOR (HILUX_TGN26 RM000001G9F01CX.html)
OK


2.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc 11 Room Temperature Sensor Circuit

  1. Remove the air conditioning amplifier assembly with its connectors still connected (HILUX_TGN26 RM000001K3A014X.html).

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G95-18 (TR) - G95-13 (SG-3)
    1. Ignition switch ON
    2. Cabin temperature 25°C (77°F)
    		1.8 to 2.2 V
    1. Ignition switch ON
    2. Cabin temperature 40°C (104°F)
    		1.2 to 1.6 V
    Text in Illustration
    *a
    		Component with harness connected
    (Air Conditioning Amplifier Assembly)
    HINT:
    As the temperature increases, the voltage decreases.
    Result
    Result
    		Proceed to
    OK (When troubleshooting according to problem symptoms table.)
    		A
    OK (When troubleshooting according to DTC.)
    		B
    NG
    		C


B
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (HILUX_TGN26 RM000001K3A014X.html)

C
Go to step 3
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (HILUX_TGN26 RM0000045E3011X.html)

3.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - COOLER THERMISTOR)

  1. Disconnect the G95 air conditioning amplifier assembly connector.

  1. Disconnect the G76 cooler thermistor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G95-18 (TR) - G76-2
    		Always
    		Below 1 Ω
    G95-13 (SG-3) - G76-1
    G95-18 (TR) - Body ground
    		Always
    		10 kΩ or higher
    G95-13 (SG-3) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (HILUX_TGN26 RM000001K3A014X.html)