AIR CONDITIONING SYSTEM, Diagnostic DTC:B1411/11

DESCRIPTION

The cooler (room temp. sensor) thermistor is installed in the instrument panel to detect the cabin temperature, which is used to control the air conditioning system. The resistance of the cooler (room temp. sensor) thermistor changes in accordance with the cabin 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 (room temp. sensor) thermistor and reads voltage changes due to changes in the resistance of the cooler (room temp. sensor) thermistor.

• *: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

PROCEDURE

1. Click here

   READ VALUE USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Air Conditioner / Data List.

   5. Read the Data List according to the display on the GTS.

      
      
      1. Body Electrical > Air Conditioner > Data List

         Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
         Room Temperature Sensor	Cooler (room temp. sensor) thermistor	Min.: -6.50°C (20.30°F) Max.: 57.25°C (135.05°F)	Actual cabin temperature displayed	-

      2. 
         
         10. 
             
      
      
      1. Body Electrical > Air Conditioner > Data List

         Tester Display
         Room Temperature Sensor

      2. 
         
         1. 
            
      3. 
         
         10. 
             

      OK
      The display is as specified in the normal condition column.

      Result
      Result Proceed to NG A OK (When troubleshooting according to Problem Symptoms Table) B OK (When troubleshooting according to the DTC) C

   
   
   • AClick here
   • B

     PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

   • C

     REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

2. Click here

   INSPECT COOLER (ROOM TEMP. SENSOR) THERMISTOR

   
   
   1. 

      *a	Component without harness connected (Cooler (Room Temp. Sensor) Thermistor)
      *b	Sensing Portion
      *c	Resistance (kΩ)
      *d	Temperature (°C (°F))
      *e	Allowable Range

      Remove the cooler (room temp. sensor) thermistor.

      Click here

   2. 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

      Note:
      

      • Hold the sensor only by its connector. Touching the sensing portion may change the resistance value.

      • When measuring, the sensor temperature must be the same as the ambient temperature.

      Tip:

      As the temperature increases, the resistance decreases (see the graph).

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPLACE COOLER (ROOM TEMP. SENSOR) THERMISTORClick here

3. Click here

   CHECK HARNESS AND CONNECTOR (COOLER (ROOM TEMP. SENSOR) THERMISTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

   
   

   1. Disconnect the O10 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition O10-16 (TR) - O82-1 Always Below 1 Ω O10-1 (SG-1) - O82-2 Always Below 1 Ω O10-16 (TR) - Body ground Always 10 kΩ or higher O10-1 (SG-1) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   
   • OK

     REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR