IMMOBILISER SYSTEM(w/o Entry and Start System), Diagnostic DTC:B2793,B2794,B2797 and 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 B2793 is stored when a malfunction is found in the door control transmitter assembly during key ID code registration or a key ID code is not registered normally. Replace the door control transmitter assembly if key ID code registration cannot be performed normally and this DTC is output.

  • DTC B2794 is stored when a door control transmitter assembly with an incomplete key ID code is used to turn the ignition switch to ON.

  • DTC B2797 is stored when a door control transmitter assembly with a BCC malfunction is used to turn the ignition switch to ON.

  • DTC B2798 is stored when a door control transmitter assembly is used to turn the ignition switch to ON but a communication error occurs between the door control transmitter assembly and transponder key ECU assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B2793

Transponder Chip Malfunction

A transponder chip malfunction (1 trip detection logic*).

  • Door control transmitter assembly

  • Transponder key coil

  • Transponder key ECU assembly

  • DTC Output Confirmation Operation:

  • Insert the door control transmitter assembly into the ignition key cylinder, turn the ignition switch from off to ON and wait at least 20 seconds.

B2794

Unmatched Encryption Code

A door control transmitter assembly with an incomplete key ID code is used to turn the ignition switch to ON (1 trip detection logic*).

  • Door control transmitter assembly

  • Transponder key coil

  • Transponder key ECU assembly

  • DTC Output Confirmation Operation:

  • Insert the door control transmitter assembly into the ignition key cylinder, turn the ignition switch from off to ON and wait at least 20 seconds.

B2797

Communication Malfunction No. 1

A door control transmitter assembly with a BCC malfunction is used to turn the ignition switch to ON (1 trip detection logic*).

  • Door control transmitter assembly

  • Transponder key coil

  • Transponder key ECU assembly

  • DTC Output Confirmation Operation:

  • Insert the door control transmitter assembly into the ignition key cylinder, turn the ignition switch from off to ON and wait at least 20 seconds.

B2798

Communication Malfunction No. 2

Key ID code identification cannot be completed within the specified time (1 trip detection logic*).

  • Door control transmitter assembly

  • Transponder key coil

  • Transponder key ECU assembly

  • DTC Output Confirmation Operation:

  • Insert the door control transmitter assembly into the ignition key cylinder, turn the ignition switch from off to ON and wait at least 20 seconds.

  • *: Only output while a malfunction is present.

Table 1. Vehicle Condition and Fail-safe Operation when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Operation when Malfunction Detected

Engine cannot be started

-
Table 2. Related Data List and Active Test

DTC No.

Data List and Active Test

B2793

-

B2794

-

B2797

-

B2798

-

CAUTION / NOTICE / HINT

Note:

  • If the transponder key ECU assembly or a door control transmitter assembly 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.

      Body Electrical > Immobiliser > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  2. CHECK FOR DTC

    1. Perform "DTC Output Confirmation Operation" procedure.

    2. Check for DTCs.

      Body Electrical > Immobiliser > Trouble Codes

      Tip:

      If DTC B2793, B2794, B2797, or B2798 is stored, clear the DTCs before checking the next door control transmitter assembly.

      OK

      DTC B2793, B2974, B2797 and B2798 are not output.

    Result

    Result

    Proceed to

    DTCs are not output

    A

    DTCs are output for all of the door control transmitter assemblies

    B

    DTCs are output for any of the door control transmitter assemblies

    C
    A

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    C

    REPLACE DOOR CONTROL TRANSMITTER ASSEMBLY THAT DTC IS OUTPUT

    B

  3. CHECK CONNECTION OF CONNECTOR

    1. Check that the connector is properly connected to the transponder key coil.

    2. Check that the engine starts with the door control transmitter assembly.

      OK

      Engine starts normally.

    Result

    Proceed to

    OK

    NG
    OK

    END (CONNECTOR WAS NOT CONNECTED PROPERLY)

    NG

  4. REPLACE TRANSPONDER KEY COIL

    1. Clear the DTCs.

      Body Electrical > Immobiliser > Clear DTCs

    2. Replace the transponder key coil.

      Click here

    3. Check that the engine starts with the door control transmitter assembly.

      Click here

      OK

      Engine starts normally.

    Result

    Proceed to

    OK

    NG
    OK

    END (TRANSPONDER KEY COIL WAS DEFECTIVE)

    NG

    REPLACE TRANSPONDER KEY ECU ASSEMBLY