Toyota Tacoma (2015-2018) Service Manual: Theft Deterrent System Presence Detection (B279C,B279C95)

Toyota Tacoma (2015-2018) Service Manual / Engine Immobiliser / Engine Immobiliser System(w/o Smart Key System) / Theft Deterrent System Presence Detection (B279C,B279C95)

DESCRIPTION

If an ECM that is incompatible with the engine immobiliser system is installed, the ECM stores this DTC.

DTC No.	DTC Detection Condition	Trouble Area	DTC Output Confirmation Operation
B279C*1	An ECM that is incompatible with engine immobiliser system is installed.	ECM	Check for DTCs.
B279C95*2	An ECM that is incompatible with engine immobiliser system is installed.	ECM	Check for DTCs.

*1: for 2TR-FE
*2: for 2GR-FKS

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
B279C*1	-
B279C95*2	-

*1: for 2TR-FE
*2: for 2GR-FKS

CAUTION / NOTICE / HINT

NOTICE:

If the ECM is replaced, refer to Registration (See page ).
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE

CLEAR DTC

(a) Clear the DTCs (See page ).

2.	CHECK FOR DTC

(a) Perform "DTC Output Confirmation Operation" procedure.

(b) Check for DTCs (See page OK: ).

OK:

DTC B279C*1 or B279C95*2 is not output.

*1: for 2TR-FE
*2: for 2GR-FKS

Result

Result	Proceed to
OK	A
NG (for 2TR-FE)	B
NG (for 2GR-FKS)	C

USE SIMULATION METHOD TO CHECK

REPLACE ECM

Theft Deterrent System Communication Line High Fixation (B279A,B279A12)

DESCRIPTION If the communication line (EFIO-IMI) to the transponder key ECU assembly is stuck high (e.g. shorted to +B), the ECM stores this DTC. DTC No. DTC Detection Condit ...

Engine Immobiliser System Malfunction (B2799,B279986)

DESCRIPTION This DTC is stored when one of the following occurs: 1) the ECM detects errors in its own communication with the transponder key ECU assembly; 2) the ECM detects errors in the communi ...

Other materials:

Inspection
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Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each sy ...

Engine does not Start but Initial Combustion Occurs
DESCRIPTION If the key ID codes of the key and transponder key ECU assembly match, the engine immobiliser system is unset and the engine start permission signal is sent to the ECM. When the ID codes of the transponder key ECU assembly and ECM match, the engine starts. WIRING DIAGRAM CAUTI ...