IMMOBILISER SYSTEM(w/o Entry and Start System), Diagnostic DTC:B2793, B2794, B2797, B2798

DTC Code DTC Name
B2793 Transponder Chip Malfunction
B2794 Unmatched Encryption Code
B2797 Communication Malfunction No. 1
B2798 Communication Malfunction No. 2

DESCRIPTION


DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2793 Transponder Chip Malfunction A transponder chip malfunction (1 trip detection logic*).

  • Key

  • Transponder key coil

  • Transponder key ECU assembly

    DTC Output Confirmation Operation:

  • Insert the key into the ignition key cylinder.
B2794 Unmatched Encryption Code A key with an incomplete key ID code is inserted into the ignition key cylinder (1 trip detection logic*).

  • Key

  • Transponder key coil

  • Transponder key ECU assembly

    DTC Output Confirmation Operation:

  • Insert the key into the ignition key cylinder.
B2797 Communication Malfunction No. 1 A key with a BCC malfunction is inserted into the ignition key cylinder (1 trip detection logic*).

  • Key

  • Transponder key coil

  • Transponder key ECU assembly

    DTC Output Confirmation Operation:

  • Insert the key into the ignition key cylinder.
B2798 Communication Malfunction No. 2 Key ID code identification cannot be completed within the specified time (1 trip detection logic*).

  • Key

  • Transponder key coil

  • Transponder key ECU assembly

    DTC Output Confirmation Operation:

  • 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 No. Data List and Active Test
B2793 Abnormal Status
B2794 Different Encrypt Code
B2797 Bcc Malfunction
B2798 Frame Error

CAUTION / NOTICE / HINT

Note


  • If the transponder key ECU assembly or key is replaced, refer to Service Bulletin.

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Immobiliser > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Insert and remove each registered key one at a time, and check for DTCs each time.

      Click here


      Body Electrical > Immobiliser > Trouble Codes

      Tech Tips


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

      • If DTC B2793, B2794, B2797 or B2798 are stored, clear the DTCs before checking the next key.

      OK
      DTC B2793, B2974, B2797 or B2798 is not output.
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output for all of the keys B
      DTCs are output for any of the keys C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    REPLACE KEY THAT DTC IS OUTPUT

    B

  3. CHECK CONNECTION OF CONNECTOR


    1. Check that the connectors are properly connected to the transponder key coil.

    2. Check that the engine starts with the key.

      OK
      Engine starts.
      Result
      Proceed to
      OK
      NG

    OK

    END (CONNECTOR WAS NOT CONNECTED PROPERLY)

    NG

  4. CHECK TRANSPONDER KEY COIL


    1. Clear the DTCs.

      Click here


      Body Electrical > Immobiliser > Clear DTCs

    2. Replace the transponder key coil.

      Click here

    3. Check that the engine starts with the key.

      OK
      Engine starts.
      Result
      Proceed to
      OK
      NG

    OK

    END (TRANSPONDER KEY COIL WAS DEFECTIVE)

    NG

    REPLACE TRANSPONDER KEY ECU ASSEMBLY