Toyota Tundra Service Manual: Unmatched Key Code (B2795)

Toyota Tundra Service Manual / Vehicle Interior / Engine Immobiliser / Engine Immobiliser System (w/o Smart Key System) / Unmatched Key Code (B2795)

DESCRIPTION

This DTC is stored when a key with a different vehicle serial number is inserted into the ignition key cylinder.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B2795	Unmatched Key Code	A key with a different vehicle serial number is inserted into the ignition key cylinder (1 trip detection logic*).	Key Transponder key ECU assembly	Insert the key into the ignition key cylinder.

*: 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 Items

DTC No.	Data List and Active Test
B2795	Different Serial Number

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Click here

2.	CHECK FOR DTC

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

Click here

HINT:

Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
If DTC B2795 is stored, check for DTCs with the next key after clearing the DTCs.

OK:

DTC B2795 is not output.

Result	Proceed to
B2795 is not output	A
B2795 is output for all of the keys	B
B2795 is output for any of the keys	C

USE SIMULATION METHOD TO CHECK

REPLACE TRANSPONDER KEY ECU ASSEMBLY

3.	CHECK OPERATION (IG ON)

(a) Check that the ignition switch can be turned to ON using the key for which the DTC was stored.

OK:

Ignition switch can be turned to ON using the key (for which the DTC was stored).

REPLACE KEY THAT DTC IS OUTPUT

4.	REREGISTRATION

(a) Clear the DTCs.

Click here

(b) Reregister the key ID code with the transponder key ECU assembly.

Click here

OK:

Registration procedure can be completed.

END (KEY REGISTRATION FAILURE)

REPLACE KEY THAT DTC IS OUTPUT

Transponder Chip Malfunction (B2793,B2794,B2797,B2798)

No Communication in Immobiliser System (B2796)

See More:

Toyota Tundra Service Manual > Sfi System: Check For Intermittent Problems
CHECK FOR INTERMITTENT PROBLEMS HINT: Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with the Techstream when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive to malfunctions than normal mode (default), whic ...

Toyota Tundra Service Manual: Unmatched Key Code (B2795)

Transponder Chip Malfunction (B2793,B2794,B2797,B2798)

No Communication in Immobiliser System (B2796)

See More:

Toyota Tundra Owners Manual

Toyota Tundra Service Manual