AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System), Diagnostic DTC:B1417/17

DTC Code DTC Name
B1417/17 Rear Evaporator Temperature Sensor Circuit

DESCRIPTION

The No. 2 cooler thermistor 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 No. 2 cooler thermistor 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 No. 2 cooler thermistor and reads voltage changes as the resistance of the No. 2 cooler thermistor changes. This sensor is used for frost prevention.

DTC Code DTC Detection Condition Trouble Area
B1417/17 An open or short in the No. 2 cooler thermistor circuit.

  • Harness or connector between No. 2 air conditioning harness assembly and air conditioning amplifier assembly

  • No. 2 air conditioning harness assembly (No. 2 cooler thermistor)

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A0158U3E04

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (NO. 2 COOLER THERMISTOR)


    1. Use the Data List to check if the No. 2 cooler thermistor is functioning properly.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Ambient Temp Sens (Rear)

      No. 2 cooler thermistor /

      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 NO. 2 COOLER THERMISTOR Click here

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  2. INSPECT NO. 2 COOLER THERMISTOR

    A01568NE03

    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) 7.40 to 9.20 kΩ
      -5°C (23°F) 5.65 to 7.00 kΩ
      0°C (32°F) 4.35 to 5.40 kΩ
      5°C (41°F) 3.40 to 4.20 kΩ
      10°C (50°F) 2.68 to 3.30 kΩ
      15°C (59°F) 2.10 to 2.60 kΩ
      20°C (68°F) 1.66 to 2.10 kΩ
      25°C (77°F) 1.32 to 1.66 kΩ
      30°C (86°F) 1.05 to 1.35 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)

    A015C1EE03

    1. Disconnect the K19 No. 2 air conditioning harness 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 Always 10 kΩ or higher

    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