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DTC B2799-86: Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid [08/2020 - 12/2021]: Procedure

  1. REGISTER ECU COMMUNICATION ID (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM) 
    1. Register the communication ID codes.

      HINT: 

      Refer to Registration.

      Refer to REGISTRATION [08/2020 - 12/2021]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK ECM (TERMINAL EFII) 
    1. Using an oscilloscope, check the waveform.
      GTY855901Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Certification ECU (Smart Key ECU Assembly))      		 *b Waveform
      *c Approximately 160 ms. *d Approximately 270 ms.

      Measurement Condition

      Tester Connection Condition Tool Setting Specified Condition
      A15-3 (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 EFII stuck low (2.4 V or less) B
      Waveform length or shape is abnormal, or EFII terminal stuck at Hi (12 V) C

    Result: 

    B 

    See step  6

    Result: 

    C 

    REPLACE ECM. Refer to  REMOVAL [08/2020 - 10/2022] 

    Result: 

    A 

    See step  3

  3. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (TERMINAL EFIO) 
    1. Using an oscilloscope, check the waveform.
      GTY851424Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Certification ECU (Smart Key ECU Assembly))      		 *b Waveform
      *c Approximately 160 ms. *d Approximately 270 ms.

      OK

      Tester Connection Condition Tool Setting Specified Condition
      A15-4 (EFIO) - Body ground Engine switch turned on (IG) using registered electrical key transmitter sub-assembly 2 V/DIV., 500 ms./DIV. Pulse generation
      (See waveform)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [08/2020 - 12/2021] 

    Result: 

    OK 

    See step  4

  4. REGISTER ECU COMMUNICATION ID 
    1. Register the ECU communication ID code.

      HINT: 

      Refer to Registration.

      Refer to REGISTRATION [08/2020 - 12/2021]

      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 [08/2020 - 10/2022] 

  6. CHECK ECM (TERMINAL IMO) 
    1. Disconnect the ECM connector.
      GTY926446Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A24-25 (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)

      Result

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

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [08/2020 - 10/2022] 

    Result: 

    A 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM) 
    1. Disconnect the A15 certification ECU (smart key ECU assembly) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A15-3 (EFII) - A24-25 (IMO) Always Below 1 Ω
      A15-3 (EFII) or A24-25 (IMO) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [08/2020 - 12/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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