ENGINE IMMOBILISER SYSTEM, Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction

DESCRIPTION

When there are communication malfunctions between the hybrid vehicle control ECU and ID code box (immobiliser code ECU), or when the communication ID codes do not match, the hybrid vehicle 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 hybrid vehicle control ECU and ID code box (immobiliser code ECU).

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

  • ID code box (immobiliser code ECU)

  • Hybrid vehicle control ECU

  • Wire harness or connector

Either condition is met:


  • 10 seconds after 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

A005CZIE48
*a Hybrid Vehicle Control ECU
*b ID Code Box (Immobiliser Code ECU)

CAUTION / NOTICE / HINT

Note


  • When replacing the ID code box (immobiliser code ECU) or hybrid vehicle control ECU, refer to Service Bulletin.

  • 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. REGISTER ECU COMMUNICATION ID


    1. Reregister the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.


    NEXT

  2. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (TERMINAL IMO)


    1. Using an oscilloscope, check the waveform.

      A0059XKE02
      Text in Illustration
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU)

      		 *b Waveform
      *c Approximately 160 ms. *d Approximately 270 ms.
      Measurement Condition
      Tester Connection Condition Tool Setting Specified Condition
      L6-23 (IMO) - Body ground Turn the power switch on (READY) 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform)
      Result
      Result Proceed to
      Normal waveform A
      Terminal IMO stuck low (2.4 V or less) B
      Waveform not output, or has abnormal wavelength or shape C

    B

    CHECK ID CODE BOX (IMMOBILISER CODE ECU) Click here

    C

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    A

  3. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (TERMINAL IMI)


    1. Using an oscilloscope, check the waveform.

      A005AVYE02
      Text in Illustration
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU)

      		 *b Waveform
      *c Approximately 160 ms. *d Approximately 270 ms.
      Measurement Condition
      Tester Connection Condition Tool Setting Specified Condition
      L6-22 (IMi) - Body ground Power switch turned on (IG) using registered electrical key transmitter sub-assembly 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform)

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    OK

  4. REGISTER ECU COMMUNICATION ID


    1. Reregister the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.


    NEXT

  5. CHECK WHETHER HYBRID CONTROL SYSTEM STARTS


    1. Check that the hybrid control system starts with an already registered vehicle key.

      OK
      Hybrid control system starts normally.

    OK

    END (ECU COMMUNICATION ID HAS NOT BEEN REGISTERED)

    NG

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

  6. CHECK ID CODE BOX (IMMOBILISER CODE ECU)


    1. Disconnect the L6 hybrid vehicle control ECU connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      L6-23 (IMO) - Body ground Power switch turned on (IG) using registered electrical key transmitter sub-assembly Terminal IMO stuck low (2.4 V or less)
      Result
      Result Proceed to
      Terminal IMO stuck low (2.4 V or less) A
      Terminal IMO stuck high (12 V) or abnormal waveform B

    B

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    A

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


    1. Disconnect the L191 ID code box (immobiliser code ECU) connector.

    2. Disconnect the L6 hybrid vehicle control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L191-3 (EFII) - L6-23 (IMO) Always Below 1 Ω
      L191-3 (EFII) or L6-23 (IMO) - Body ground Always 10 kΩ or higher
      L191-4 (EFIO) - L6-22 (IMI) Always Below 1 Ω
      L191-4 (EFIO) or L6-22 (IMI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. REPLACE ID CODE BOX (IMMOBILISER CODE ECU)


    1. Replace the ID code box (immobiliser code ECU).

      Tech Tips

      Refer to Service Bulletin.


    NEXT

  9. REGISTER RECOGNITION CODE


    1. Register the recognition codes in the ECUs.

      Tech Tips

      Refer to Service Bulletin.


    NEXT

  10. REGISTER ECU COMMUNICATION ID


    1. Reregister the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.


    NEXT

  11. CHECK WHETHER HYBRID CONTROL SYSTEM STARTS


    1. Check that the hybrid control system starts with an already registered vehicle key.

      OK
      Hybrid control system starts normally.

    A

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

    B

    REPLACE HYBRID VEHICLE CONTROL ECU Click here