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

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

NEXT

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
A

USE SIMULATION METHOD TO CHECK

B

REPLACE TRANSPONDER KEY ECU ASSEMBLY

C

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).

NG

REPLACE KEY THAT DTC IS OUTPUT
OK

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.

OK

END (KEY REGISTRATION FAILURE)
NG

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 > Ignition Key Cylinder Light: Inspection
    INSPECTION PROCEDURE 1. INSPECT TRANSPONDER KEY COIL (IGNITION KEY CYLINDER LIGHT) (a) Apply battery voltage to the connector and check the light illumination condition. OK: Condition Specified Condition Battery positive (+) → Terminal 2 (ILL+) Battery negative (-) → Terminal 4 (ILL-) Illuminate ...

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