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DTC B2799-86: Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid [12/2017 - 10/2023]: Procedure

  1. REGISTER ECU COMMUNICATION ID (ID CODE BOX (IMMOBILISER CODE ECU) - ECM) 
    1. Register the communication ID codes.

      HINT: 

      Refer to Registration.

      Refer to REGISTRATION [12/2017 - 10/2020] , or refer to REGISTRATION [10/2020 - 10/2022] , or refer to REGISTRATION [10/2022 - 10/2023]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK ECM (TERMINAL EFII) 
    1. Using an oscilloscope, check the waveform.
      GTY816943Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (ID Code Box (Immobiliser Code ECU))      		 *b Waveform
      *c Approximately 160 ms. *d Approximately 270 ms.

      Measurement Condition

      Tester Connection Condition Tool Setting Specified Condition
      G58-3 (EFII) - Body ground Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after cable disconnected and reconnected to battery 2 V/DIV., 500 ms./DIV. Pulse generation
      (See waveform)

      Result

      Result Proceed to
      Normal waveform A
      Terminal IMO stuck low (2.4 V or less) B
      Waveform length or shape is abnormal, or IMO terminal stuck at Hi (12 V) C

    Result: 

    B 

    See step  6

    Result: 

    C 

    See step  8

    Result: 

    A 

    See step  3

  3. CHECK ID CODE BOX (IMMOBILISER CODE ECU) (TERMINAL EFIO) 
    1. Using an oscilloscope, check the waveform.
      GTY782834Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (ID Code Box (Immobiliser Code ECU))      		 *b Waveform
      *c Approximately 160 ms. *d Approximately 270 ms.

      Measurement Condition

      Tester Connection Condition Tool Setting Specified Condition
      G58-4 (EFIO) - Body ground Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after cable disconnected and reconnected to battery 2 V/DIV., 500 ms./DIV. Pulse generation
      (See waveform)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU). Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    OK 

    See step  4

  4. REGISTER ECU COMMUNICATION ID (ID CODE BOX (IMMOBILISER CODE ECU) - ECM) 
    1. Register the ECU communication ID codes.

      HINT: 

      Refer to Registration.

      Refer to REGISTRATION [12/2017 - 10/2020] , or refer to REGISTRATION [10/2020 - 10/2022] , or refer to REGISTRATION [10/2022 - 10/2023]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  5

  5. CHECK WHETHER ENGINE STARTS 
    1. Check that the engine starts.

      Result

      Result Proceed to
      Engine was started A
      Engine was not started B

    Result: 

    A 

    END (ECU COMMUNICATION ID HAS NOT BEEN REGISTERED) 

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

  6. CHECK ECM (TERMINAL IMO) 
    1. Disconnect the A95 ECM connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A95-37 (IMO) - Body ground Engine switch turned on (IG) using registered electrical key transmitter sub-assembly Terminal IMO stuck low (2.4 V or less)
      Terminal IMO stuck high (12 V) or abnormal waveform

      Result

      Result Proceed to
      Terminal IMO stuck low (2.4 V or less) A
      Terminal IMO stuck high (12 V) or abnormal waveform B

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    A 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM) 
    1. Disconnect the G58 ID code box (immobiliser code ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G58-3 (EFII) - A95-37 (IMO) Always Below 1 Ω
      G58-3 (EFII) or A95-37 (IMO) - Other terminals and body ground Always 10 kΩ or higher
      G58-4 (EFIO) - A95-38 (IMI) Always Below 1 Ω
      G58-4 (EFIO) or A95-38 (IMI) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU). Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM) 
    1. Disconnect the G58 ID code box (immobiliser code ECU) connector.
    2. Disconnect the A95 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G58-3 (EFII) - A95-37 (IMO) Always Below 1 Ω
      G58-3 (EFII) or A95-37 (IMO) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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