Dtc B279A Theft Deterrent System Communication Line High Fixation

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Theft Deterrent Keyless Entry. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM)

CHECK ID CODE BOX (IMMOBILISER CODE ECU) (OUTPUT)

CHECK ID CODE BOX (IMMOBILISER CODE ECU) (POWER SOURCE AND BODY GROUND)

DTC B279A Theft Deterrent System Communication Line High Fixation


DESCRIPTION

If the communication line (EFIO-IMI) to the ID code box (immobiliser code ECU) is stuck on HI output, the ECM outputs this DTC.

DTC Code
DTC Detection Condition
Trouble Area
B279A
When the communication line (EFIO-IMI) between the ECM and the ID code box (immobiliser code ECU) is stuck on HI output.
  1. Harness or connector
  2. ID code box (immobiliser code ECU)
  3. ECM

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B279A Theft Deterrent System Communication Line High Fixation


Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B279A Theft Deterrent System Communication Line High Fixation


Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B279A Theft Deterrent System Communication Line High Fixation


INSPECTION PROCEDURE

1.CLEAR DTC

  1. Clear the DTCs (Click here).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (Click here).

    HINT:
    If DTCs other than DTC B279A are output, troubleshoot those DTCs first.
    Result
    Result
    		Proceed to
    DTC B279A is output
    		A
    DTC B279A and other DTCs are output
    		B


B
Go to DIAGNOSTIC TROUBLE CODE CHART (Click here)
A


3.CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B279A Theft Deterrent System Communication Line High Fixation

  1. Disconnect the E28 ID code box connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B279A Theft Deterrent System Communication Line High Fixation

  1. Disconnect the A38*1 or A52*2 ECU connector.

    HINT:
    1. *1: for LHD
    2. *2: for RHD

  1. Measure the resistance and voltage according to the value(s) in the table below.

    1. for 1UR-FE

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      E28-6 (EFIO) - A38*1-40 (IMI)
      		Always
      		Below 1 Ω
      E28-6 (EFIO) or A38*1-40 (IMI) - Body ground
      		Always
      		10 kΩ or higher
      E28-6 (EFIO) - A52*2-40 (IMI)
      		Always
      		Below 1 Ω
      E28-6 (EFIO) or A52*2-40 (IMI) - Body ground
      		Always
      		10 kΩ or higher
      HINT:
      1. *1: for LHD
      2. *2: for RHD
      Standard Voltage:
      Tester Connection
      		Condition
      		Specified Condition
      E28-6 (EFIO) - Body ground
      		Always
      		Below 1 V
      A38*1-40 (IMI) - Body ground
      A52*2-40 (IMI) - Body ground
      HINT:
      1. *1: for LHD
      2. *2: for RHD

    2. for 1GR-FE, 1VD-FTV

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      E28-6 (EFIO) - A38*1-11 (IMI)
      		Always
      		Below 1 Ω
      E28-6 (EFIO) or A38*1-11 (IMI) - Body ground
      		Always
      		10 kΩ or higher
      E28-6 (EFIO) - A52*2-11 (IMI)
      		Always
      		Below 1 Ω
      E28-6 (EFIO) or A52*2-11 (IMI) - Body ground
      		Always
      		10 kΩ or higher
      HINT:
      1. *1: for LHD
      2. *2: for RHD
      Standard Voltage:
      Tester Connection
      		Condition
      		Specified Condition
      E28-6 (EFIO) - Body ground
      		Always
      		Below 1 V
      A38*1-11 (IMI) - Body ground
      A52*2-11 (IMI) - Body ground
      HINT:
      1. *1: for LHD
      2. *2: for RHD

    3. for 3UR-FE

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      E28-6 (EFIO) - A38-40 (IMI)
      		Always
      		Below 1 Ω
      E28-6 (EFIO) or A38-40 (IMI) - Body ground
      		Always
      		10 kΩ or higher
      Standard Voltage:
      Tester Connection
      		Condition
      		Specified Condition
      E28-6 (EFIO) - Body ground
      		Always
      		Below 1 V
      A38-40 (IMI) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK ID CODE BOX (IMMOBILISER CODE ECU) (OUTPUT)

Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B279A Theft Deterrent System Communication Line High Fixation

  1. Using an oscilloscope, check the waveform.

    Measurement Condition
    Item
    		Content
    Tester Connection
    		E28-6 (EFIO) - E28-8 (GND)
    Tool Setting
    		10 V/DIV., 100 msec./DIV.
    Condition
    		Engine switch on (IG)
    OK:
    Waveform is output normally (see illustration).
    Result
    Result
    		Proceed to
    NG
    		A
    OK (for 1GR-FE)
    		B
    OK (for 1UR-FE)
    		C
    OK (for 1VD-FTV)
    		D
    OK (for 3UR-FE)
    		E


B
REPLACE ECM (Click here)

C
REPLACE ECM (Click here)

D
REPLACE ECM (Click here)

E
REPLACE ECM (Click here)
A


5.CHECK ID CODE BOX (IMMOBILISER CODE ECU) (POWER SOURCE AND BODY GROUND)
Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B279A Theft Deterrent System Communication Line High Fixation

  1. Turn the engine switch on (IG).

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connector
    		Condition
    		Specified Condition
    E28-1 (+B) - E28-8 (GND)
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)