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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 91 (Heating / Air Conditioning System (HV) - Diagnostic Codes (2 Of 3)) >> AIR CONDITIONING SYSTEM (for HV Model) >> DTC P0535-15: Evaporator Temperature Sensor Circuit Short to Battery or Open [11/2023 - ] >> Procedure

DTC P0535-15: Evaporator Temperature Sensor Circuit Short to Battery or Open [11/2023 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK EVAPORATOR TEMP. SENSOR (NO. 1 COOLER THERMISTOR) CIRCUIT 

    Pre-procedure1

    1. Disconnect the A evaporator temp. sensor (No. 1 cooler thermistor) connector.
      GTY1229684Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Evaporator Temp. Sensor (No. 1 Cooler Thermistor))

      Procedure1

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A-2 - Body ground Ignition switch ON 0 to 5.5 V

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  2

  2. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Air Conditioner > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. CHECK FOR DTC 

    Pre-procedure1

    1. Turn the ignition switch off.
    2. Disconnect the A evaporator temp. sensor (No. 1 cooler thermistor) connector.
      GTY1229684Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Evaporator Temp. Sensor (No. 1 Cooler Thermistor))
    3. Connect terminals 1 and 2 of the evaporator temp. sensor (No. 1 cooler thermistor) connector on the wire harness side.
      GTY1250319Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Evaporator Temp. Sensor (No. 1 Cooler Thermistor)
      *2 Air Conditioning Amplifier Assembly
    4. Turn the ignition switch to ON and wait for 4 seconds or more.

      Procedure1

    5. Check for DTCs.

      Body Electrical > Air Conditioner > Trouble Codes 

      Result

      Result Proceed to
      P0535-11 is output A
      P0535-15 is output B

      Post-procedure1

    6. None

    Result: 

    A 

    REPLACE EVAPORATOR TEMP. SENSOR (NO. 1 COOLER THERMISTOR) 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    B 

    See step  4

  4. INSPECT AIR CONDITIONING HARNESS ASSEMBLY (EVAPORATOR TEMP. SENSOR (NO. 1 COOLER THERMISTOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY) 

    Pre-procedure1

    1. Remove the air conditioning harness assembly.

      HINT: 

      Refer to DISASSEMBLY [10/2022 - ]

      Procedure1

    2. Measure the resistance according to the value(s) in the table below.
      GTY1250377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of air conditioning harness assembly connector
      (to Air Conditioning Amplifier Assembly)      		 *b Front view of air conditioning harness assembly connector
      (to Evaporator Temp. Sensor (No. 1 Cooler Thermistor))

      Standard Resistance

      Tester Connection Condition Specified Condition
      A-2 - z18-6 (TE) Always Below 1 Ω
      A-1 - z18-5 (SG) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY 

    Refer to DISASSEMBLY [10/2022 - ]

  5. INSPECT AIR CONDITIONING HARNESS ASSEMBLY (EVAPORATOR TEMP. SENSOR (NO. 1 COOLER THERMISTOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY) 

    Pre-procedure1

    1. Remove the air conditioning harness assembly.

      HINT: 

      Refer to DISASSEMBLY [10/2022 - ]

      Procedure1

    2. Measure the resistance according to the value(s) in the table below.
      GTY1249977Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of air conditioning harness assembly connector
      (to Air Conditioning Amplifier Assembly)      		 *b Front view of air conditioning harness assembly connector
      (to Evaporator Temp. Sensor (No. 1 Cooler Thermistor))

      Standard Resistance

      Tester Connection Condition Specified Condition
      A-2 or z18-6 (TE) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY 

    Refer to DISASSEMBLY [10/2022 - ]

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