TTGuideTacoma manuals & technical reference
Toyota Tacoma (2015-2018) Service Manual / Engine Immobiliser / Engine Immobiliser System(w/ Smart Key System) / Malfunction of ID-BOX Recognition (B278D)

Toyota Tacoma (2015-2018) Service Manual: Malfunction of ID-BOX Recognition (B278D)

DESCRIPTION

When the certification ECU (smart key ECU assembly) detects an input signal indicating that the vehicle is equipped with an ID code box even though the ID code box is not registered, the certification ECU (smart key ECU assembly) stores this DTC.

DTC Code

DTC Detection Condition

Trouble Area

DTC Output Confirmation Operation

B278D

One of the following conditions is met:

  • The certification ECU (smart key ECU assembly) recognizes that the wire harness judging whether the vehicle is equipped with an ID code box or not is provided even though the ID code box is not registered.
  • The certification ECU (smart key ECU assembly) receives a LIN signal from the ID code box even though the ID code box is not registered.
  • The certification ECU (smart key ECU assembly) receives a LIN signal from the ID code box even though the wire harness judging whether the vehicle is equipped with an ID code box or not is not provided.

Misconnection of the ID code box

Always
  • *: 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

Key registration will be prohibited

-
Related Data List and Active Test

DTC Code

Data List and Active Test

B278D

-

CAUTION / NOTICE / HINT

NOTICE:

  • Before performing following inspection procedure, check that the ID code box (immobiliser code ECU) is not installed on the vehicle.
  • Before replacing the certification ECU (smart key ECU assembly), refer to Registration (See page After performing repairs, perform the operation that fulfills the DTC ).
  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs (See page ).

NEXT

2.

CHECK DTC OUTPUT

(a) Check for DTCs (See page HINT: ).

HINT:

Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

OK:

DTC B278D is not output.

OK

END
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    Related Tacoma materials

    Operation Check
    OPERATION CHECK 1. INSPECT INTERIOR LIGHT CONTROL OPERATION NOTICE: Perform this inspection with the customize parameters at the default settings. The interior light control illuminates the lights below. Engine Switch Illumination*1 Transponder Key Coil (Ignition Key Cylinder Light)* ...

    Rear Differential Lock: Operation and Conditions
    Use the rear differential lock system only when wheel spin occurs because the Toyota Tacoma is stuck in a ditch or traveling on a slippery, rough, or uneven surface. The system is particularly effective when one of the rear wheels is spinning and additional traction is required. Rear differential lo ...

    Pressure Control Solenoid "D" Performance (Shift Solenoid Valve SLT) (P2714)
    SYSTEM DESCRIPTION The shift solenoid valve SLT controls the transmission line pressure for smooth transmission operation based on signals from the throttle position sensor and the vehicle speed sensor. The ECM adjusts the current to shift solenoid valve SLT to control hydraulic line pressure ...