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

DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction

DESCRIPTION

When there are communication malfunctions between the ECM and certification ECU (smart key ECU assembly), or when the communication ID codes do not match, the ECM stores this DTC.

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2799

Either condition is met (1 trip detection logic*):


  • A malfunction in the communication or communication lines between the ECM and certification ECU (smart key ECU assembly).

  • A matching communication code cannot be verified during communication between the ECM and certification ECU (smart key ECU assembly).

  • Certification ECU (smart key ECU assembly)

  • ECM

  • Wire harness or connector

Either condition is met:


  • Within 10 seconds of an engine start operation being performed (with the shift lever in P and the brake pedal depressed, the engine switch is pressed while carrying the key). If there is a malfunction, the engine stops (communication begins within 3 seconds of the engine start operation being performed, and DTCs are stored after 6 seconds).

  • 10 seconds after the engine switch is turned on (IG) after reconnecting the cable to the negative (-) battery terminal (communication begins within 3 seconds of the engine switch being turned on (IG), and DTCs are stored after 6 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 Code Data List and Active Test
B2799 -

WIRING DIAGRAM

A01I0UVE34

INSPECTION PROCEDURE

Note


  • When replacing the certification ECU (smart key ECU assembly), refer to Registration Click here.

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

Tech Tips

When DTC B2799 and the certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) DTC.

PROCEDURE


  1. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID Click here.


    NEXT

  2. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  3. CHECK FOR DTC


    1. Start the engine.

    2. Perform "DTC Output Confirmation Operation" procedure.

    3. Check for DTCs Click here.

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

    B

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM) Click here

    C

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

  4. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM)


    1. Disconnect the A43 certification ECU (smart 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
      for 2GR-FE
      Tester Connection Condition Specified Condition
      A43-14 (EFII) - A25-30 (IMO) Always Below 1 Ω
      A43-14 (EFII) or A25-30 (IMO) - Body ground Always 10 kΩ or higher
      A43-13 (EFIO) - A25-31 (IMI) Always Below 1 Ω
      A43-13 (EFIO) or A25-31 (IMI) - Body ground Always 10 kΩ or higher
      for 2AR-FE
      Tester Connection Condition Specified Condition
      A43-14 (EFII) - A25-29 (IMO) Always Below 1 Ω
      A43-14 (EFII) or A25-29 (IMO) - Body ground Always 10 kΩ or higher
      A43-13 (EFIO) - A25-28 (IMI) Always Below 1 Ω
      A43-13 (EFIO) or A25-28 (IMI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (TERMINAL EFII)


    1. Using an oscilloscope, check the waveform.

      A01I19VE01
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 *b Approximately 160 ms
      *c Approximately 270 ms *d Waveform
      Measurement Condition
      Tester Connection Condition Tool Setting Specified Condition
      A43-14 (EFII) - Body ground Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform)
      OK
      The 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 has abnormal wavelength or shape (for 2GR-FE) C
      Terminal IMO stuck high (12 V), or has abnormal wavelength or shape (for 2AR-FE) D

    B

    INSPECT ECM (IMO TERMINAL VOLTAGE) Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    A

  6. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (TERMINAL EFIO)


    1. Using an oscilloscope, check the waveform.

      A01HZA1E01
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 *b Approximately 160 ms
      *c Approximately 270 ms *d Waveform
      Measurement Condition
      Tester Connection Condition Tool Setting Specified Condition
      A43-13 (EFIO) - Body ground Engine switch on (IG) using registered electrical key transmitter sub-assembly 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform)
      OK
      The waveform is similar to that shown in the illustration.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

  7. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID Click here.


    NEXT

  8. CHECK WHETHER ENGINE STARTS


    1. Using an electrical key transmitter sub-assembly which is registered to the vehicle, turn the engine switch on (IG).

    2. Check that the engine starts 5 seconds after the engine switch was turned on (IG).

      OK
      Engine starts normally.
      Result
      Result Proceed to
      OK A
      NG (for 2GR-FE) B
      NG (for 2AR-FE) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

  9. INSPECT ECM (IMO TERMINAL VOLTAGE)


    1. A01HZCFE71
      Text in Illustration
      *A for 2GR-FE
      *B for 2AR-FE
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the A25 ECM connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      for 2GR-FE
      Tester Connection Condition Specified Condition
      A25-30 (IMO) - Body ground Engine switch 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
      for 2AR-FE
      Tester Connection Condition Specified Condition
      A25-29 (IMO) - Body ground Engine switch on (IG) using registered electrical key transmitter sub-assembly Terminal IMO stuck low (2.4 V or less)
      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 (for 2GR-FE) B
      Terminal IMO stuck high (12 V) or abnormal waveform (for 2AR-FE) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

  10. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Replace the certification ECU (smart key ECU assembly) with a new one Click here.


    NEXT

  11. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID Click here.


    NEXT

  12. CHECK WHETHER ENGINE STARTS


    1. Using an electrical key transmitter sub-assembly which is registered to the vehicle, turn the engine switch on (IG).

    2. Check that the engine starts 5 seconds after the engine switch was turned on (IG).

      OK
      Engine starts normally.
      Result
      Result Proceed to
      OK A
      NG (for 2GR-FE) B
      NG (for 2AR-FE) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)