ENGINE IMMOBILISER SYSTEM, Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction

DESCRIPTION

When there are communication malfunctions between the power management control ECU and certification ECU (smart key ECU assembly), or when the communication ID codes do not match, the power management control ECU 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 power management control ECU and certification ECU (smart key ECU assembly).

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

  • Certification ECU (smart key ECU assembly)

  • Power management control ECU

  • Wire harness or connector

Either condition is met:


  • Within 10 seconds of a hybrid control system start operation (with the shift lever in P and the brake pedal depressed, the power switch is pressed while carrying the key). If there is a malfunction, the hybrid control system does not start (communication begins within 3 seconds of the hybrid control system start operation, 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 Code Data List and Active Test
B2799 -

WIRING DIAGRAM

A01HVLHE07

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. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the I87 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the I4 power management control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I87-10 (EFII) - I4-20 (IMO) Always Below 1 Ω
      I4-20 (IMO) - Body ground Always 10 kΩ or higher
      I87-14 (EFIO) - I4-21 (IMI) Always Below 1 Ω
      I4-21 (IMI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID Click here.


    NEXT

  3. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  4. CHECK DTC OUTPUT


    1. Check for DTCs Click here.

      Tech Tips

      Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

      OK
      DTC B2799 is not output.

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

    END (ECU COMMUNICATION ID HAS NOT BEEN REGISTERED)

  5. REPLACE POWER MANAGEMENT CONTROL ECU


    1. Temporarily replace the power management control ECU with a new or known good one Click here.


    NEXT

  6. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  7. CHECK DTC OUTPUT


    1. Check for DTCs Click here.

      Tech Tips

      Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

      OK
      DTC B2799 is not output.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

    END (POWER MANAGEMENT CONTROL ECU WAS DEFECTIVE)