Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - THEFT DETERRENT / KEYLESS ENTRY

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.	Harness or connector ID code box (immobiliser code ECU) ECM

WIRING DIAGRAM

Dtc B279A Theft Deterrent System Communication Line High Fixation. THEFT DETERRENT / KEYLESS ENTRY. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

1.CLEAR DTC

Clear the DTCs ().

NEXT

2.CHECK FOR DTC

Check for DTCs ().

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 ()

A

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

Dtc B279A Theft Deterrent System Communication Line High Fixation. THEFT DETERRENT / KEYLESS ENTRY. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the E28 ID code box connector.

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

HINT:

*1: for LHD

*2: for RHD

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

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: for LHD

*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: for LHD

*2: for RHD

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: for LHD

*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: for LHD

*2: for RHD

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)

Dtc B279A Theft Deterrent System Communication Line High Fixation. THEFT DETERRENT / KEYLESS ENTRY. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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 ()

C

REPLACE ECM ()

D

REPLACE ECM ()

E

REPLACE ECM ()

A

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

Turn the engine switch on (IG).

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)

THEFT DETERRENT / KEYLESS ENTRY

Land Cruiser URJ200 URJ202 GRJ200 VDJ200

ENGINE IMMOBILISER SYSTEM w/ Entry and Start System

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