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 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.
DTC B2794 is stored when a key with an incomplete key ID code is inserted into the ignition key cylinder.
DTC B2797 is stored when a key with a BCC malfunction is inserted into the ignition key cylinder.
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.	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	-

CAUTION / NOTICE / HINT

Note

If the transponder key ECU assembly or key is replaced, refer to the Service Bulletin.
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
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.

PROCEDURE

CLEAR DTC

Clear the DTCs.

Body Electrical > Immobiliser > Clear DTCs

Result

Proceed to
NEXT

CHECK FOR DTC

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

Body Electrical > Immobiliser > Trouble Codes

Tech Tips

Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
If DTC B2793, B2794, B2797, or B2798 is stored, clear the DTCs before checking the next key.

Result

Proceed to
DTC B2793, B2794, B2797 and B2798 are not output
DTCs are output for all of the keys
DTCs are output for any of the keys

DTC B2793, B2794, B2797 and B2798 are not output

USE SIMULATION METHOD TO CHECK Click here

DTCs are output for any of the keys

REPLACE KEY FOR WHICH DTC WAS OUTPUT

DTCs are output for all of the keys

CHECK CONNECTION OF CONNECTOR

Check that the engine starts with the key.

OK
Engine starts.

Result

Proceed to
OK
NG

END (CONNECTOR WAS NOT CONNECTED PROPERLY)

CHECK TRANSPONDER KEY COIL

Check that the engine starts with the key.

OK
Engine starts.

Result

Proceed to
OK
NG

END (TRANSPONDER KEY COIL WAS DEFECTIVE)

REPLACE TRANSPONDER KEY ECU ASSEMBLY