Dtc B1411/11 Room Temperature Sensor Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER

INSPECT AIR CONDITIONING AMPLIFIER

INSPECT A/C ROOM TEMPERATURE SENSOR

CHECK HARNESS AND CONNECTOR (A/C ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to the ON position and turn the intelligent tester main switch on.
   

3. Select the item below in the Data List, and read the display on the intelligent tester.
   
   

   Data List / Air Conditioner:

   Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
   Room Temperature Sensor (Room Temp)	Room temperature sensor / min.: -6.5°C (20.3°F), max.: 57.25°C (135.05°F)	Actual cabin temperature is displayed	-

   OK:

   The display is as specified in the normal condition column.
   

   
   

   Result:

   
   

   Result	Proceed to
   NG	A
   OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)	B
   OK (When troubleshooting according to the DTC)	C

1. Remove the A/C amplifier with the connectors still connected.
   

2. Turn the ignition switch to the ON position.
   

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   E38-29 (TR) - E38-34 (SG-1)	Ignition switch: ON at 25°C (77°F)	1.35 to 1.75 V
   E38-29 (TR) - E38-34 (SG-1)	Ignition switch: ON at 40°C (104°F)	0.9 to 1.2 V

   HINT:

   As the temperature increases, the voltage decreases.

   Result:

   Result	Proceed to
   NG	A
   OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)	B
   OK (When troubleshooting according to the DTC)	C

1. Remove the A/C room temperature sensor.
   

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

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   E27-1 - E27-2	10°C (50°F)	3.00 to 3.73 kΩ
   E27-1 - E27-2	15°C (59°F)	2.45 to 2.88 kΩ
   E27-1 - E27-2	20°C (68°F)	1.95 to 2.30 kΩ
   E27-1 - E27-2	25°C (77°F)	1.60 to 1.80 kΩ
   E27-1 - E27-2	30°C (86°F)	1.28 to 1.47 kΩ
   E27-1 - E27-2	35°C (95°F)	1.00 to 1.22 kΩ
   E27-1 - E27-2	40°C (104°F)	0.80 to 1.00 kΩ
   E27-1 - E27-2	45°C (113°F)	0.65 to 0.85 kΩ
   E27-1 - E27-2	50°C (122°F)	0.50 to 0.70 kΩ
   E27-1 - E27-2	55°C (131°F)	0.44 to 0.60 kΩ
   E27-1 - E27-2	60°C (140°F)	0.36 to 0.50 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).

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

2. Disconnect the connector from the A/C room temperature sensor.
   

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

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   E38-29 (TR) - E27-1	Always	Below 1 Ω
   E38-34 (SG-1) - E27-2	Always	Below 1 Ω
   E38-29 (TR) - Body ground	Always	10 kΩ or higher
   E38-34 (SG-1) - Body ground	Always	10 kΩ or higher