ENGINE IMMOBILISER SYSTEM, Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction

DESCRIPTION

This DTC is output 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 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 transponder key ECU DTCs are present. If present, troubleshoot the transponder key ECU DTCs first.

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

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


  • 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*1 or clutch pedal*2 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

A01E20WE01

INSPECTION PROCEDURE

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.

Tech Tips

After troubleshooting for this DTC, make sure B2799 is not present. If present, troubleshoot the blocking system DTCs next.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for the DTCs Click here.

      OK
      DTC B2799 is not output.

    NG

    REREGISTER ECU COMMUNICATION ID Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  3. REREGISTER ECU COMMUNICATION ID


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


    NEXT

  4. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  5. CHECK FOR DTC


    1. Check for the DTCs Click here.

      OK
      DTC B2799 is not output.

    NG

    CHECK CONNECTION OF CONNECTOR Click here

    OK

    END (ECU COMMUNICATION ID IS NOT REGISTERED CORRECTLY)

  6. CHECK CONNECTION OF CONNECTOR


    1. Turn the ignition switch off.

    2. Check that the connectors are properly connected to the ECM and transponder key ECU assembly.

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTOR CORRECTLY

    OK

  7. CHECK HARNESS AND CONNECTOR (SFI OR ECD COMMUNICATION LINE)


    1. Disconnect the T21 transponder key ECU assembly connector.

    2. Disconnect the E6*1, E10*2, E13*3 or E30*4 ECM connector.


      • *1: for 1KD-FTV, 2KD-FTV (except DPF)

      • *2: for 1TR-FE, 2TR-FE

      • *3: for 1GR-FE

      • *4: for 1KD-FTV, 2KD-FTV (for DPF)

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

      Standard Resistance
      for 1KD-FTV, 2KD-FTV (except DPF)
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) - E6-30 (IMI) Always Below 1 Ω
      T21-12 (EFII) - E6-29 (IMO) Always Below 1 Ω
      T21-13 (EFIO) or E6-30 (IMI) - Body ground Always 10 kΩ or higher
      T21-12 (EFII) or E6-29 (IMO) - Body ground Always 10 kΩ or higher
      for 1TR-FE, 2TR-FE
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) - E10-16 (IMI) Always Below 1 Ω
      T21-12 (EFII) - E10-15 (IMO) Always Below 1 Ω
      T21-13 (EFIO) or E10-16 (IMI) - Body ground Always 10 kΩ or higher
      T21-12 (EFII) or E10-15 (IMO) - Body ground Always 10 kΩ or higher
      for 1GR-FE
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) - E13-16 (IMI) Always Below 1 Ω
      T21-12 (EFII) - E13-15 (IMO) Always Below 1 Ω
      T21-13 (EFIO) or E13-16 (IMI) - Body ground Always 10 kΩ or higher
      T21-12 (EFII) or E13-15 (IMO) - Body ground Always 10 kΩ or higher
      for 1KD-FTV, 2KD-FTV (for DPF)
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) - E30-28 (IMI) Always Below 1 Ω
      T21-12 (EFII) - E30-29 (IMO) Always Below 1 Ω
      T21-13 (EFIO) or E30-28 (IMI) - Body ground Always 10 kΩ or higher
      T21-12 (EFII) or E30-29 (IMO) - Body ground Always 10 kΩ or higher

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

      Standard Voltage
      for 1KD-FTV, 2KD-FTV (except DPF)
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) or E6-30 (IMI) - Body ground Always Below 1 V
      T21-12 (EFII) or E6-29 (IMO) - Body ground Always Below 1 V
      for 1TR-FE, 2TR-FE
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) or E10-16 (IMI) - Body ground Always Below 1 V
      T21-12 (EFII) or E10-15 (IMO) - Body ground Always Below 1 V
      for 1GR-FE
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) or E13-16 (IMI) - Body ground Always Below 1 V
      T21-12 (EFII) or E13-15 (IMO) - Body ground Always Below 1 V
      for 1KD-FTV, 2KD-FTV (for DPF)
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) or E30-28 (IMI) - Body ground Always Below 1 V
      T21-12 (EFII) or E30-29 (IMO) - Body ground Always Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. REPLACE ECM


    1. Temporarily replace the ECM with a new one.



    NEXT

  9. REREGISTER ECU COMMUNICATION ID


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


    NEXT

  10. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  11. CHECK FOR DTC


    1. Check for the DTCs Click here.

      OK
      DTC B2799 is not output.

    NG

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

    OK

    END (ECM IS DEFECTIVE)