IMMOBILISER SYSTEM(w/o Smart Entry and Start System), Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction

DESCRIPTION

The ECM stores this DTC when a communication line between the ECM and transponder key ECU assembly is malfunctioning or the communication ID of the ECM and transponder key ECU assembly do not match.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2799 Engine Immobiliser System Malfunction

One of the following conditions is met:


  • Error in communication between ECM and transponder key ECU assembly.

  • Error in communication lines.

  • Communication ID is different during communication between ECM and transponder key ECU assembly.

  • Wire harness or connector

  • Transponder key ECU assembly

  • ECM

    DTC Output Confirmation Operation:

  • Start the engine and wait 10 seconds.

  • After disconnecting and reconnecting the cable to the negative (-) battery terminal, turn the ignition switch to ON and wait 10 seconds.
Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Engine cannot be started -
Related Data List and Active Test
DTC No. Data List and Active Test
B2799 -

WIRING DIAGRAM

B006ZDJE04
*1 Transponder Key ECU Assembly

CAUTION / NOTICE / HINT

Note


  • If the transponder key ECU assembly or ECM is replaced, refer to Service Bulletin.

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

Tech Tips

If transponder key ECU assembly DTCs are output simultaneously, troubleshoot the transponder key ECU assembly DTCs first.

PROCEDURE


  1. REGISTER ECU COMMUNICATION ID


    1. Reregister the ECU communication ID.

      Result
      Proceed to
      NEXT

    NEXT

  2. INSPECT TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFII)


    1. Using an oscilloscope, check the waveform.

      B006X20C01
      *a

      Component with harness connected

      (Transponder Key ECU Assembly)

      		 *b Waveform
      *c Approximately 160 ms. *d Approximately 270 ms.
      OK
      Tester Connection Condition Tool Setting Specified Condition
      K60-10 (EFII) - Body ground Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform)
      OK
      Waveform is similar to that shown in the illustration.
      Result
      Result Proceed to
      OK A
      NG (Terminal EFII stuck low (2.4 V or less)) B
      NG (Terminal EFII stuck high (12 V) or abnormal waveform) C

    B

    INSPECT ECM (IMO TERMINAL VOLTAGE) Click here

    C

    REPLACE ECM Click here

    A

  3. INSPECT TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)


    1. Using an oscilloscope, check the waveform.

      B006X4CC02
      *a

      Component with harness connected

      (Transponder Key ECU Assembly)

      		 *b Waveform
      *c Approximately 160 ms. *d Approximately 270 ms.
      OK
      Tester Connection Condition Tool Setting Specified Condition
      K60-11 (EFIO) - Body ground Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform)
      OK
      Waveform is similar to that shown in the illustration.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

    OK

  4. REGISTER ECU COMMUNICATION ID


    1. Reregister the ECU communication ID.

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK WHETHER ENGINE STARTS


    1. Using a registered door control transmitter assembly, turn the ignition switch to ON.

    2. Check that the engine starts 5 seconds after the ignition switch was turned to ON.

      OK
      Engine starts normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

    NG

    REPLACE ECM Click here

  6. INSPECT ECM (IMO TERMINAL VOLTAGE)


    1. Disconnect the A22 ECM connector.

    2. Turn the ignition switch to ON.

    3. B006XYSC06
      *a

      Front view of wire harness connector

      (to ECM)

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

      Standard Voltage
      Tester Connection Condition Result
      A22-45 (IMO) - Body ground Ignition switch turned to ON using registered door control transmitter 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

    B

    REPLACE ECM Click here

    A

  7. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)


    1. Disconnect the K60 transponder key ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K60-10 (EFII) - A22-45 (IMO) Always Below 1 Ω
      K60-10 (EFII) or A22-45 (IMO) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR