AIR CONDITIONING SYSTEM, Diagnostic DTC:B1417/17

DESCRIPTION

The 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 control the air conditioning. It sends appropriate signals to the air conditioning amplifier assembly. The resistance of the rear evaporator temperature sensor changes in accordance with the cooled air temperature that has passed through the rear 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 rear evaporator temperature sensor and reads voltage changes as the resistance of the rear evaporator temperature sensor changes. This sensor is used for frost prevention.

WIRING DIAGRAM

INSPECTION PROCEDURE

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.

      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.

   
   

   NG

   INSPECT REAR EVAPORATOR TEMPERATURE SENSOR Click here

   OK

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

2. INSPECT REAR EVAPORATOR TEMPERATURE SENSOR

   

   
   

   1. Remove the No. 2 air conditioning harness assembly Click here.

   2. 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

      Note

      
      

      • Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor.

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

      Tech Tips

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

   
   

   NG

   REPLACE NO. 2 AIR CONDITIONING HARNESS ASSEMBLY Click here

   OK

3. CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER)

   

   
   

   1. Disconnect the K19 No. 2 air conditioning harness assembly connector.

   2. Disconnect the E35 amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition K19-8 (+) - E35-17 (TEC) Always Below 1 Ω K19-7 (-) - E35-1 (SG) Always Below 1 Ω E35-17 (TEC) - Body ground Always 10 kΩ or higher E35-1 (SG) - Body ground

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. CHECK NO. 2 AIR CONDITIONING HARNESS ASSEMBLY (OPERATION)

   
   

   1. Replace the No. 2 air conditioning harness assembly with a normal one and check that the condition returns to normal Click here.

   
   

   NEXT

5. CHECK FOR DTC

   
   

   1. Clear the DTCs Click here.

   2. Check for DTCs Click here.

      OK
      DTC B1417 is not output.

   
   

   NG

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

   OK

   REPLACE NO. 2 AIR CONDITIONING HARNESS ASSEMBLY Click here