ENGINE IMMOBILISER SYSTEM (w/o Smart Key System), Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction

DESCRIPTION

This DTC is stored when one of the following occurs: 1) the ECM detects errors in its own communication with the transponder key ECU assembly; 2) the ECM detects errors in the communication lines; or 3) the ECU communication ID between the transponder key ECU assembly and ECM is different and an engine start is attempted.

DTC No. DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2799

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

  • ECM

  • Transponder key ECU assembly

  • 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

A01I0KQE04

INSPECTION PROCEDURE

Note


  • If the transponder key ECU assembly or ECM is replaced, refer to Registration Click here.

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

Tech Tips

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

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Perform "DTC Output Confirmation Operation" procedure.

    2. Check for DTCs Click here.

      OK
      DTC B2799 is not output.
      Result
      Result Proceed to
      DTC B2799 is output A
      Other DTCs are output B
      DTC B2799 is not output C

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. INSPECT ECM (TERMINAL IMO)


    1. Using an oscilloscope, check the waveform.

      A01HYC6E01
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

      		 *b Waveform
      *c Approximately 160 ms *d Approximately 270 ms
      Measurement Condition
      Tester Connection Condition Tool Setting Specified Condition
      A25-29 (IMO) - 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
      Normal waveform A
      Terminal IMO stuck low (2.4 V or less) B
      Terminal IMO stuck high (12 V) or abnormal waveform C

    B

    INSPECT ECM (IMO TERMINAL VOLTAGE) Click here

    C

    REPLACE ECM Click here

    A

  4. INSPECT ECM (TERMINAL IMI)


    1. Using an oscilloscope, check the waveform.

      A01HZHLE01
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

      		 *b Waveform
      *c Approximately 160 ms *d Approximately 270 ms
      Measurement Condition
      Tester Connection Condition Tool Setting Specified Condition
      A25-28 (IMI) - 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.

    NG

    REPLACE TRANSPONDER KEY ECU ASSEMBLY Click here

    OK

  5. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID Click here.


    NEXT

  6. 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.

    NG

    REPLACE ECM Click here

    OK

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

  7. INSPECT ECM (IMO TERMINAL VOLTAGE)


    1. A01HZCFE70
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the A25 ECM connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A25-29 (IMO) - Body ground Ignition switch turned to ON using registered door control transmitter assembly Terminal IMO stuck low (2.4 V or less)
      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

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


    1. Disconnect the I19 transponder key ECU assembly connector.

    2. Disconnect the A25 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I19-12 (EFII) - A25-29 (IMO) Always Below 1 Ω
      I19-12 (EFII) or A25-29 (IMO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. REPLACE TRANSPONDER KEY ECU ASSEMBLY


    1. Replace the transponder key ECU assembly with a new one Click here.

      Note

      Key ID code registration is necessary when replacing the transponder key ECU assembly, refer to Registration Click here.


    NEXT

  10. 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.

    NG

    REPLACE ECM Click here

    OK

    END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

  11. REPLACE ECM


    1. Temporarily replace the ECM with a new one Click here.


    NEXT

  12. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID Click here.


    NEXT

  13. 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.

    NG

    REPLACE TRANSPONDER KEY ECU ASSEMBLY Click here

    OK

    END (ECM WAS DEFECTIVE)