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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Smart Key System (For Start, Except HV) - Diagnostic Codes (1 Of 2) >> SMART KEY SYSTEM (for Start Function, Gasoline Model) >> DTC B2286: Runnable Signal Malfunction; DTC B228A: Engine Speed Signal Circuit; DTC P0335: Crankshaft Position Sensor Circuit Malfunction (NE Signal) [12/2019 - 10/2021] >> Procedure

DTC B2286: Runnable Signal Malfunction; DTC B228A: Engine Speed Signal Circuit; DTC P0335: Crankshaft Position Sensor Circuit Malfunction (NE Signal) [12/2019 - 10/2021]: Procedure

  1. READ VALUE USING GTS (ENGINE CONDITION / ENGINE SPEED) 
    1. Read the Data List according to the display on the GTS.

      Body Electrical > Power Source Control > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Engine Condition Engine state Stop or Run Stop: Engine stopped
      Run: Engine running      		 -

      Body Electrical > Power Source Control > Data List 

      Tester Display
      Engine Condition

      Body Electrical > Starting Control > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Engine Speed Engine speed 0 to 16383 rpm Fluctuates in accordance with actual engine speed -

      Body Electrical > Starting Control > Data List 

      Tester Display
      Engine Speed

      OK

      The GTS display changes correctly in response to the engine condition.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 10/2022] 

    Result: 

    NG 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM) 
    1. Disconnect the A19 certification ECU (smart key ECU assembly) connector.
    2. Disconnect the A28 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A19-16 (NE) - A28-30 (NEO) Always Below 1 Ω
      A19-16 (NE) or A28-30 (NEO) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    1. Connect the A19 certification ECU (smart key ECU assembly) connector.
    2. Connect the A28 ECM connector.
    3. Using an oscilloscope, check the engine speed input signal waveform at the terminal of the certification ECU (smart key ECU assembly).
      GTY865532Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Certification ECU (Smart Key ECU Assembly))

      OK

      Tester Connection Condition Specified Condition
      A19-16 (NE) - Body ground Engine stopped No pulse generation
      Engine running Pulse generation

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [12/2019 - 11/2023] 

    Result: 

    NG 

    REPLACE ECM. Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 10/2022] 

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