IMMOBILISER SYSTEM, Diagnostic DTC:B2799-790

DTC Code DTC Name
B2799-790 Engine Immobiliser System Malfunction

DESCRIPTION

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

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2799-790 Engine Immobiliser System Malfunction

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


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

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

  • ID code box (immobiliser code ECU)

  • Hybrid vehicle control ECU assembly

  • Wire 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 shift lever in P 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).

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
B2799-790 -

WIRING DIAGRAM

A01MTCOE34
*a Hybrid Vehicle Control ECU Assembly
*b ID Code Box (Immobiliser Code 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 hybrid vehicle control ECU assembly 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 B2799-790 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 > Hybrid Control > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR DTC


    1. Perform "DTC Output Confirmation Operation" procedure.

    2. Check for DTCs.


      Powertrain > Hybrid Control > Trouble Codes
      OK
      B2799-790 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) - HYBRID VEHICLE CONTROL ECU ASSEMBLY)


    1. Disconnect the K83 ID code box (immobiliser code ECU) connector.

    2. Disconnect the K142 hybrid vehicle control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K83-4 (EFIO) - K142-22 (IMI) Always Below 1 Ω
      K83-3 (EFII) - K142-23 (IMO) Always Below 1 Ω
      K83-4 (EFIO) or K142-22 (IMI) - Body ground Always 10 kΩ or higher
      K83-3 (EFII) or K142-23 (IMO) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY


    1. Temporarily replace the hybrid vehicle control ECU assembly with a new one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CLEAR DTC


    1. Clear the DTCs.


      Powertrain > Hybrid Control > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK FOR DTC


    1. Perform "DTC Output Confirmation Operation" procedure.

    2. Check for DTCs.


      Powertrain > Hybrid Control > Trouble Codes
      OK
      B2799-790 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HYBRID VEHICLE CONTROL ECU ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)