AIR CONDITIONING SYSTEM(for Manual Air Conditioning System), Diagnostic DTC:B1417

DTC Code DTC Name
B1417 Evaporator Temperature Circuit

DESCRIPTION

The No. 2 air conditioning harness assembly is installed on the evaporator in the rear air conditioner unit to detect the temperature of the cooled air that has passed through the evaporator, which is used to control the air conditioning system. It sends signals to the air conditioning amplifier assembly. The resistance of the No. 2 air conditioning harness assembly changes in accordance with the temperature of the cooled air that has passed through the 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 air conditioning harness assembly and reads voltage changes as the resistance of the No. 2 air conditioning harness assembly changes. This sensor is used for frost prevention.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1417 Evaporator Temperature Circuit Open or short in rear evaporator temperature sensor circuit

  • No. 2 air conditioning harness assembly

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

  • Air conditioning amplifier assembly

Memorized

(4 sec. or more)*1

WIRING DIAGRAM

A0028F3E02
*a Rear Evaporator Temperature Sensor
*b Air Conditioning Amplifier Assembly
*c No. 2 Air Conditioning Harness Assembly

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Check the value(s) by referring to the table below.


      Body Electrical > Air Conditioner > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Evap Temp Sensor (Rear) No. 2 air conditioning harness assembly

      Min.: -29.70°C (-21.46°F)

      Max.: 59.55°C (139.19°F)

      		 Actual rear evaporator temperature displayed -

      Body Electrical > Air Conditioner > Data List
      Tester Display
      Evap Temp Sensor (Rear)
      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

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

  2. INSPECT NO. 2 AIR CONDITIONING HARNESS ASSEMBLY


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

      Click here

      A0028NFC01
      *a

      Component without harness connected

      (No. 2 Air Conditioning Harness Assembly)

      		 *b Sensing Portion
      *c Resistance (kΩ) *d Temperature (°C (°F))
      *e Allowable Range - -

    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


      • 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.

      Tech Tips

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

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 AIR CONDITIONING HARNESS ASSEMBLY Click here

    OK

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


    1. Disconnect the F81 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
      L20-8 (+) - F81-5 (TEC) Always Below 1 Ω
      L20-7 (-) - F81-7 (SGND) Always Below 1 Ω
      L20-8 (+) - Body ground Always 10 kΩ or higher
      L20-7 (-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR