ENGINE IMMOBILISER SYSTEM(w/o Entry and Start 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 communications with the transponder key ECU assembly; 2) the ECM detects errors in the communication lines; or 3) the ECU - ECM communication ID between the transponder key ECU assembly and ECM is different and an engine start is attempted. Before troubleshooting for this DTC, make sure no engine immobiliser DTCs are output. If output, troubleshoot the engine immobiliser DTCs first.

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

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


  • A malfunction occurs in the communication or communication lines between the ECM and transponder key ECU assembly.

  • A communication code cannot be verified during communication between the ECM and transponder key ECU assembly.

  • Harness or connector

  • Transponder key ECU assembly

  • ECM

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, turn the ignition switch to ON). 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 ignition switch is turned to ON after reconnecting the cable to the negative (-) battery terminal (communication begins within 3 seconds of the ignition switch being turned to ON, 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

A005IRLE01

CAUTION / NOTICE / HINT

Note


  • The fixed 12 V power source voltage in the ECM is output through a resistance from terminal IMI. The transponder key ECU assembly grounds or does not ground this power source voltage accordingly.

  • The fixed 12 V power source voltage in the transponder key ECU assembly is output through a resistance from terminal EFII. The ECM grounds or does not ground this power source voltage accordingly.

  • When replacing the transponder key ECU assembly or ECM, refer to the Service Bulletin.

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

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. 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

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    Go to DIAGNOSTIC TROUBLE CODE CHART Click here

    B

  3. CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)


    1. A005K9VE02
      Text in Illustration
      *a

      Component with harness connected

      (Transponder Key ECU Assembly)
      *b Waveform

      Using an oscilloscope, check the waveform.

      Measurement Condition
      Item Content
      Tester Connection F54-13 (EFIO) - F54-16 (GND)
      Tool Setting 10 V/DIV., 100 ms./DIV.
      Condition Ignition switch ON

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      OK
      Waveform is output normally (refer to illustration).
      Result
      Result Proceed to
      Normal waveform A
      Terminal EFIO stuck low (1 V or less) B
      Terminal EFIO stuck high (10 V) C

    B

    CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO) Click here

    C

    CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM AND BODY GROUND) Click here

    A

  4. CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFII)


    1. A005J9JE01
      Text in Illustration
      *a

      Component with harness connected

      (Transponder Key ECU Assembly)
      *b Waveform

      Using an oscilloscope, check the waveform.

      Measurement Condition
      Item Content
      Tester Connection F54-12 (EFII) - F54-16 (GND)
      Tool Setting 5 V/DIV., 500 ms./DIV.
      Condition Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after ignition switch first turned to ON after battery disconnected and reconnected

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      OK
      Waveform is output normally (refer to illustration).
      Result
      Result Proceed to
      Terminal EFII stuck high (15 V) A
      Terminal EFII stuck low (10 V or less) B

    B

    CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFII) Click here

    A

  5. REREGISTER ECU - ECM COMMUNICATION ID


    1. Reregister the ECU - ECM communication ID (Refer to service Bulletin).


    NEXT

  6. CHECK WHETHER ENGINE STARTS


    1. Check that the engine starts with an already registered vehicle key.

      OK
      Engine starts normally.

    OK

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

    NG

  7. REPLACE TRANSPONDER KEY ECU ASSEMBLY


    1. Temporarily replace the transponder key ECU assembly with a new one (Refer to Service Bulletin).


    NEXT

  8. REGISTER ECU - ECM COMMUNICATION ID (ECU COMMUNICATION ID REGISTRATION)


    1. Register the ECU - ECM communication ID (Refer to Service Bulletin).


    NEXT

  9. CHECK WHETHER ENGINE STARTS


    1. Check that the engine starts with the key.

      OK
      Engine starts normally.
      Result
      Result Proceed to
      OK A
      NG (1NR-FE) B
      NG (1ND-TV) C

    A

    END (TRANSPONDER KEY ECU WAS DEFECTIVE)

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

  10. CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)


    1. A005K9VE02
      Text in Illustration
      *a

      Component with harness connected

      (Transponder Key ECU Assembly)
      *b Waveform

      Disconnect A58*1 or A59*2 ECM connector.

    2. Using an oscilloscope, check the waveform.


      • *1: for 1NR-FE

      • *2: for 1ND-TV

      Measurement Condition
      Item Content
      Tester Connection F54-13 (EFIO) - F54-16 (GND)
      Tool Setting 10 V/DIV., 100 ms./DIV.
      Condition Ignition switch ON

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      OK
      Waveform is output normally (refer to illustration).
      Result
      Result Proceed to
      Terminal EFIO stuck high (10 V) A
      Terminal EFIO stuck low (1 V or less) (1NR-FE) B
      Terminal EFIO stuck low (1 V or less) (1ND-TV) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

  11. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM AND BODY GROUND)


    1. Disconnect the F54 transponder key ECU assembly connector.

    2. Disconnect the A58*1 or A59*2 ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F54-13 (EFIO) - A58-28 (IMI)*1 Always Below 1 Ω
      F54-13 (EFIO) - A59-77 (IMI)*2 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F54-13 (EFIO) or A58-28 (IMI) - Body ground*1 Always 10 kΩ or higher
      F54-13 (EFIO) or A59-77 (IMI) - Body ground*2 Always 10 kΩ or higher

      • *1: for 1NR-FE

      • *2: for 1ND-TV


    OK

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFII)


    1. A005J9JE01
      Text in Illustration
      *a

      Component with harness connected

      (Transponder Key ECU Assembly)
      *b Waveform

      Disconnect the A58*1 or A59*2 ECM connector.

    2. Using an oscilloscope, check the waveform.


      • *1: 1NR-FE

      • *2: 1ND-TV

      Measurement Condition
      Item Content
      Tester Connection F54-12 (EFII) - F54-16 (GND)
      Tool Setting 5 V/DIV., 500 ms./DIV.
      Condition Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after ignition switch first turned to ON after battery disconnected and reconnected

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      OK
      Waveform is output normally (refer to illustration).
      Result
      Result Proceed to
      Terminal EFIO stuck high (15 V) A
      Terminal EFII stuck low (10 V or less) B

    B

    CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM AND BODY GROUND) Click here

    A

  13. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM AND BODY GROUND)


    1. Disconnect the F54 transponder key ECU assembly connector.

    2. Disconnect the A58*1 or A59*2 ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F54-12 (EFII) - A58-29 (IMO)*1 Always Below 1 Ω
      F54-12 (EFII) - A59-78 (IMO)*2 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F54-12 (EFII) or A58-29 (IMO) - Body ground*1 Always 10 kΩ or higher
      F54-12 (EFII) or A59-78 (IMO) - Body ground*2 Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (1NR-FE) B
      OK (1ND-TV) C

      • *1: for 1NR-FE

      • *2: for 1ND-TV


    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

  14. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM AND BODY GROUND)


    1. Disconnect the F54 transponder key ECU assembly connector.

    2. Disconnect the A58*1 or A59*2 ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F54-12 (EFII) - A58-29 (IMO)*1 Always Below 1 Ω
      F54-12 (EFII) - A59-78 (IMO)*2 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F54-12 (EFII) or A58-29 (IMO) - Body ground*1 Always 10 kΩ or higher
      F54-12 (EFII) or A59-78 (IMO) - Body ground*2 Always 10 kΩ or higher

      • *1: for 1NR-FE

      • *2: for 1ND-TV


    OK

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR