ENGINE IMMOBILISER SYSTEM, Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction

DESCRIPTION

This DTC is stored when one of the following occurs: 1) the power management control ECU (HV CPU) detects an error in its own communication with the certification ECU assembly (smart key ECU assembly)*1 or ID code box (immobiliser code ECU)*2; 2) the power management control ECU (HV CPU) detects an error in the communication lines; or 3) the ECU communication ID between the certification ECU assembly (smart key ECU assembly)*1 or ID code box (immobiliser code ECU)*2 and power management control ECU (HV CPU) is different and a hybrid vehicle control system start is attempted.


Tech Tips

Before troubleshooting this DTC, make sure that no certification ECU (smart key ECU assembly) DTCs are present. If present, troubleshoot the certification ECU (smart key ECU assembly) DTCs first.

DTC No. DTC Detection Condition Trouble Area
B2799

One of the following conditions is met:


  • Error in communication between power management control ECU (HV CPU) and certification ECU assembly (smart key ECU assembly)*1 or ID code box (immobiliser code ECU)*2

  • Error in communication lines

  • Communication ID is different between certification ECU assembly (smart key ECU assembly)*1 or ID code box (immobiliser code ECU)*2 and power management control ECU (HV CPU) during communication

  • Wire harness or connector

  • Power management control ECU (HV CPU)

  • Certification ECU (Smart key ECU assembly)*1

  • ID code box (Immobiliser code ECU)*2

WIRING DIAGRAM


  1. w/o Airbag Cut-off Switch

    A01JCN5E08

  2. w/ Airbag Cut-off Switch

    A01JCN5E07

INSPECTION PROCEDURE

Note


  • If the certification ECU (smart key ECU assembly) is replaced, register all the keys and ECU communication ID.*1

  • If the ID code box (immobiliser code ECU) is replaced, register the ECU code and ECU communication ID.*2


    • *1: w/o Airbag Cut-off Switch

    • *2: w/ Airbag Cut-off Switch

PROCEDURE


  1. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      OK
      DTC B2799 is not output.

    NG

    RE-REGISTER ECU COMMUNICATION ID Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. RE-REGISTER ECU COMMUNICATION ID


    1. Re-register the ECU communication ID.


    NEXT

  3. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      OK
      DTC B2799 is not output.

    NG

    CHECK CONNECTOR CONNECTION CONDITION Click here

    OK

    END (ECU COMMUNICATION ID WAS NOT REGISTERED CORRECTLY)

  4. CHECK CONNECTOR CONNECTION CONDITION


    1. Turn the power switch off.

    2. Check that the connectors are properly connected to the power management control ECU (HV CPU) and certification ECU (smart key ECU assembly)*1 or ID code box (immobiliser code ECU)*2.


      • *1: w/o Airbag Cut-off Switch

      • *2: w/ Airbag Cut-off Switch

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  5. SYSTEM CHECK


    1. Check the vehicle specification.

      Result
      Result Proceed to
      w/o Airbag Cut-off Switch A
      w/ Airbag Cut-off Switch B

    B

    CHECK HARNESS AND CONNECTOR (ID CODE BOX - POWER MANAGEMENT CONTROL ECU (HV CPU)) Click here

    A

  6. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER MANAGEMENT CONTROL ECU (HV CPU))


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

    2. A01J90HE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))
      *2

      Front view of wire harness connector

      (to Power Management Control ECU (HV CPU))

      Disconnect the power management control ECU (HV CPU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L62-34 (EFII) - L6-20 (IMO) Always Below 1 Ω
      L62-35 (EFIO) - L6-21 (IMI) Always Below 1 Ω
      L6-20 (IMO) - Body ground Always 10 kΩ or higher
      L6-21 (IMI) - Body ground Always 10 kΩ or higher
      Standard Voltage
      Tester Connection Condition Specified Condition
      L6-20 (IMO) - Body ground Always Below 1 V
      L6-21 (IMI) - Body ground Always Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. REPLACE POWER MANAGEMENT CONTROL ECU (HV CPU)


    1. Replace the power management control ECU (HV CPU) Click here.


    NEXT

  8. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      OK
      DTC B2799 is not output.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (POWER MANAGEMENT CONTROL ECU (HV CPU) WAS DEFECTIVE)

  9. CHECK HARNESS AND CONNECTOR (ID CODE BOX - POWER MANAGEMENT CONTROL ECU (HV CPU))


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

    2. A01J9U9E03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ID Code Box (Immobiliser Code ECU))
      *2

      Front view of wire harness connector

      (to Power Management Control ECU (HV CPU))

      Disconnect the power management control ECU (HV CPU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L10-5 (EFII) - L6-20 (IMO) Always Below 1 Ω
      L10-6 (EFIO) - L6-21 (IMI) Always Below 1 Ω
      L6-20 (IMO) - Body ground Always 10 kΩ or higher
      L6-21 (IMI) - Body ground Always 10 kΩ or higher
      Standard Voltage
      Tester Connection Condition Specified Condition
      L6-20 (IMO) - Body ground Always Below 1 V
      L6-21 (IMI) - Body ground Always Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. REPLACE POWER MANAGEMENT CONTROL ECU (HV CPU)


    1. Replace the power management control ECU (HV CPU) Click here.


    NEXT

  11. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      OK
      DTC B2799 is not output.

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    OK

    END (POWER MANAGEMENT CONTROL ECU (HV CPU) WAS DEFECTIVE)