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Home >> Toyota >> 2019 >> Highlander Limited, FWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning System (Manual A/C) - Diagnostic Codes & Circuit Tests - (Except Hybrid) >> AIR CONDITIONING SYSTEM (for Manual Air Conditioning System) >> DTC B1417: Evaporator Temperature Circuit [12/2013 - 11/2016] >> Procedure

DTC B1417: Evaporator Temperature Circuit [12/2013 - 11/2016]: Procedure

  1. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream 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

    Result:  2

    B 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2013 - 11/2016] 

    Result:  3

    C 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [12/2013 - ] 

    Result:  1

    A 

    See step  2

  2. INSPECT NO. 2 AIR CONDITIONING HARNESS ASSEMBLY 
    1. Remove the No. 2 air conditioning harness assembly.

      Refer to REMOVAL [12/2013 - ]

      GTY442952Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *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.

      HINT: 

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

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE NO. 2 AIR CONDITIONING HARNESS ASSEMBLY. Refer to  REMOVAL [12/2013 - ] 

    Result:  1

    OK 

    See step  3

  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

    Result:  1

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [12/2013 - ] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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