Dtc B2793 Transponder Chip Malfunction

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Theft Deterrent Keyless Entry. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK CONNECTION OF CONNECTOR

CHECK TRANSPONDER KEY COIL

DTC B2793 Transponder Chip Malfunction

DTC B2794 Unmatched Encryption Code

DTC B2797 Communication Malfunction No. 1

DTC B2798 Communication Malfunction No. 2


DESCRIPTION

  1. DTC B2793 is stored when a malfunction is found in the key during key ID code registration or a key ID code is not registered normally. Replace the key if key ID code registration cannot be performed normally and this DTC is output.
  2. DTC B2794 is stored when a key with an incomplete key ID code is inserted into the ignition key cylinder.
  3. DTC B2797 is stored when a key with a BCC malfunction is inserted into the ignition key cylinder.
  4. DTC B2798 is stored when a key is inserted into the ignition key cylinder but a communication error occurs between the key and transponder key ECU assembly.

DTC No.
DTC Detection Condition
Trouble Area
DTC Output Confirmation Operation
B2793
A transponder chip malfunction (1 trip detection logic*).
  1. Key
  2. Transponder key coil
  3. Transponder key ECU assembly
Insert the key into the ignition key cylinder
B2794
A key with an incomplete key ID code is inserted into the ignition key cylinder (1 trip detection logic*).
  1. Key
  2. Transponder key coil
  3. Transponder key ECU assembly
Insert the key into the ignition key cylinder
B2797
A key with a BCC malfunction is inserted into the ignition key cylinder (1 trip detection logic*).
  1. Key
  2. Transponder key coil
  3. Transponder key ECU assembly
Insert the key into the ignition key cylinder
B2798
Key ID code identification cannot be completed within the specified time (1 trip detection logic*).
  1. Key
  2. Transponder key coil
  3. Transponder key ECU assembly
Insert the key into the ignition key cylinder
  1. *: Only output while a malfunction is present.

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
-
B2794
-
B2797
-
B2798
-

INSPECTION PROCEDURE

NOTICE:
  1. If the transponder key ECU assembly or key is replaced, refer to the Service Bulletin.
  2. After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
  3. When using the GTS with the vehicle ignition switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Immobiliser. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
1.CLEAR DTC

  1. Clear the DTCs (Click here).


NEXT


2.CHECK FOR DTC

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

    HINT:
    1. Before checking for DTCs, perform "DTC Output Confirmation Operation" procedure.
    2. If DTCs B2793, B2794, B2797, or B2798 are stored, clear the DTCs before checking the next key.
    OK:
    DTCs B2793, B2794, B2797 and B2798 are 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


B
Go to step 3

C
REPLACE KEY FOR WHICH DTC WAS OUTPUT
A

USE SIMULATION METHOD TO CHECK (Click here)

3.CHECK CONNECTION OF CONNECTOR

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

  1. Check that the engine starts with the key.

    OK:
    Engine starts.


NG
Go to step 4
OK

END (CONNECTOR WAS NOT CONNECTED PROPERLY)

4.CHECK TRANSPONDER KEY COIL

  1. Clear the DTCs (Click here).

  1. Temporarily replace the transponder key coil with a new one or known good one (Click here).

  1. Check that the engine starts with the key.

    OK:
    Engine starts.


NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK

END (TRANSPONDER KEY COIL WAS DEFECTIVE)