IMMOBILISER SYSTEM, Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Immobiliser Malfunction

DESCRIPTION

When there is a communication malfunction between the EV control ECU and ID code box (immobiliser code ECU), or when the communication ID codes do not match, the EV control ECU stores this DTC.

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

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


  • A malfunction in the communication or communication lines between the EV control ECU and ID code box (immobiliser code ECU).

  • A matching communication code cannot be verified during communication between the EV control ECU and ID code box (immobiliser code ECU).

  • ID code box (immobiliser code ECU)

  • EV control ECU

  • Harness or connector

DTC output confirmation operation (Either condition is met):


  • Within 10 seconds of a hybrid control system start operation being performed (with the park (P) selected and the brake pedal depressed, the power switch is pressed while the key is being carried). If there is a malfunction, the hybrid control system stops (communication begins within 3 seconds of the hybrid control system start operation being performed, and DTCs are stored after 6 seconds).

  • 10 seconds after the power switch is turned on (IG) after reconnecting the cable to the negative (-) auxiliary battery terminal (communication begins within 3 seconds of the power switch being turned on (IG), and DTCs are stored after 6 seconds).

DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition Hybrid control system start operation. ○ ○ ○
Malfunction Status A malfunction in the communication between the EV control ECU and ID code box (immobiliser code ECU). ○ - -
A malfunction in the communication lines between the EV control ECU and ID code box (immobiliser code ECU). - ○ -
A matching communication code cannot be verified during communication between the EV control ECU and ID code box (immobiliser code ECU). - - ○
Detection Time - -
Number of Trips 1 trip 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Hybrid control system cannot be started -
Related Data List and Active Test
DTC No. Data List and Active Test
B2799 -

WIRING DIAGRAM

A01MIY8E03
*a ID Code Box (Immobiliser Code ECU)
*b EV Control ECU

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the power switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • Before replacing the EV control ECU or ID code box (immobiliser code ECU), refer to Service Bulletin.

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

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.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  2. CLEAR DTC


    1. Clear the DTCs.


      Powertrain > EV > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR DTC


    1. Perform "DTC Output Confirmation Operation" procedure.

    2. Check for DTCs.


      Powertrain > EV > Trouble Codes
      OK
      B2799 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

    NG

  4. CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - EV CONTROL ECU)


    1. Disconnect the G15 ID code box (immobiliser code ECU) connector.

    2. Disconnect the G46 EV control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G15-4 (EFIO) - G46-22 (IMI) Always Below 1 Ω
      G15-3 (EFII) - G46-23 (IMO) Always Below 1 Ω
      G15-4 (EFIO) or G46-22 (IMI) - Body ground Always 10 kΩ or higher
      G15-3 (EFII) or G46-23 (IMO) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE ID CODE BOX (IMMOBILISER CODE ECU)


    1. Replace the ID code box (immobiliser code ECU) with a new one.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  6. REGISTER RECOGNITION CODE


    1. Register the recognition codes in the ECUs.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  7. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  8. CLEAR DTC


    1. Clear the DTCs.


      Powertrain > EV > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK FOR DTC


    1. Perform "DTC Output Confirmation Operation" procedure.

    2. Check for DTCs.


      Powertrain > EV > Trouble Codes
      OK
      B2799 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE)

    NG

    REPLACE EV CONTROL ECU Click here