ENGINE IMMOBILISER SYSTEM(w/o Entry and Start System), Diagnostic DTC:B2796

DTC Code DTC Name
B2796 No Communication in Immobiliser System

DESCRIPTION


DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2796 The key code cannot be transmitted (1 trip detection logic*).

  • Key

  • Harness or connector

  • Transponder key ECU assembly

  • Transponder key amplifier

 Insert the key into the ignition key cylinder.

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Engine cannot be started -
Related Data List and Active Test
DTC Code Data List and Active Test
B2796 Response

WIRING DIAGRAM

A005HY3E03
*a CODE
*b Antenna Coil
*c TRANSPONDER KEY ECU ASSEMBLY
*d TRANSPONDER KEY AMPLIFIER

CAUTION / NOTICE / HINT

Note


  • When replacing the transponder key ECU assembly or key, refer to the Service Bulletin.

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B2796 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. CHECK WHETHER ENGINE STARTS WITH OTHER KEYS


    1. Check if the engine starts with an already registered vehicle key.

      OK
      Engine starts.

    OK

    REREGISTER KEY CODE OR REPLACE KEY THAT CANNOT START ENGINE

    NG

  4. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY AMPLIFIER)


    1. Disconnect the F54 transponder key ECU assembly connector.

    2. Disconnect the F55 transponder key amplifier connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F54-14 (VC5) - F55-1 (VC5) Always Below 1 Ω
      F54-15 (CODE) - F55-4 (CODE) Always Below 1 Ω
      F54-4 (TXCT) - F55-5 (TXCT) Always Below 1 Ω
      F54-5 (AGND) - F55-7 (AGND) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F54-14 (VC5) or F55-1 (VC5) - Body ground Always 10 kΩ or higher
      F54-15 (CODE) or F55-4 (CODE) - Body ground Always 10 kΩ or higher
      F54-4 (TXCT) or F55-5 (TXCT) - Body ground Always 10 kΩ or higher
      F54-5 (AGND) or F55-7 (AGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE TRANSPONDER KEY AMPLIFIER


    1. Temporarily replace the transponder key amplifier with a new or normally functioning one Click here.


    NEXT

  6. CHECK WHETHER ENGINE STARTS


    1. Check that the engine starts normally.

      OK
      Engine starts normally.

    OK

    END (TRANSPONDER KEY AMPLIFIER WAS DEFECTIVE)

    NG

    REPLACE TRANSPONDER KEY ECU ASSEMBLY