ENGINE IMMOBILISER SYSTEM, Diagnostic DTC:B2799-790

DTC Code DTC Name
B2799-790 Engine Immobiliser System Malfunction

DESCRIPTION

This DTC is output when one of the following occurs: 1) the hybrid vehicle control ECU detected errors in its own communications with the immobiliser code ECU; 2) the hybrid vehicle control ECU detects errors in the communication lines; or 3) the ECU communication ID between the immobiliser code ECU and hybrid vehicle control ECU is different and a hybrid control system start is attempted.

Before troubleshooting for this DTC, make sure no certification ECU DTCs are present. If present, troubleshoot the certification ECU DTCs first.

DTC No. DTC Detection Condition Trouble Area
B2799-790

One of following conditions is met:


  • Error in communication between hybrid vehicle control ECU and immobiliser code ECU

  • Error in communication lines

  • Communication ID is different during communication with immobiliser code ECU

  • Harness or connector

  • Hybrid vehicle control ECU

  • ID code ECU

WIRING DIAGRAM

A000XHAE08
*a Hybrid Vehicle Control ECU
*b ID Code Box

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTC Click here.

      OK
      DTC B2799-790 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. REREGISTER ECU CODE


    1. Reregister the recognition codes in ECUs.


    NEXT

  4. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  5. CHECK FOR DTC


    1. Recheck for DTC Click here.

      OK
      DTC B2799-790 is not output.

    OK

    END (RECOGNITION CODE IN ECU IS DEFECTIVE)

    NG

  6. CHECK CONNECTION OF CONNECTOR


    1. Turn the power switch OFF.

    2. Check that the connectors are properly connected to the hybrid vehicle control ECU and the ID code box.

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  7. CHECK HARNESS AND CONNECTOR (ID CODE BOX - HYBRID VEHICLE CONTROL ECU)

    A000Z27E02
    *1 Front view of wire harness connector: (to ID Code Box)
    *2 Front view of wire harness connector: (to Hybrid Vehicle Control ECU)

    1. Disconnect the L32 box connector.

    2. Disconnect the A77 ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L32-5 (EFII) - A77-33 (IMO) Always Below 1 Ω
      L32-6 (EFIO) - A77-32 (IMI)
      L32-5 (EFII) or A77-33 (IMO) - Body ground Always 10 kΩ or higher
      L32-6 (EFIO) or A77-32 (IMI) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. REPLACE HYBRID VEHICLE CONTROL ECU


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


    NEXT

  9. REGISTER ECU CODE


    1. Register the recognition code in ECU.


    NEXT

  10. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  11. CHECK FOR DTC


    1. Recheck for DTC Click here.

      OK
      DTC B2799-790 is not output.

    OK

    END (HYBRID VEHICLE CONTROL ECU IS DEFECTIVE)

    NG

    REPLACE ID CODE BOX