THEFT DETERRENT / KEYLESS ENTRY  IMMOBILISER SYSTEM(w/ Smart Entry and Start System)  B279A  Theft Deterrent System Communication Line High Fixation  


DESCRIPTION

When the communication line (IMI - EFIO) between the ECM and ID code box (immobiliser code ECU) is stuck high, the ECM stores this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B279A Theft Deterrent System Communication Line High Fixation The communication line (IMI - EFIO) between the ECM and ID code box (immobiliser code ECU) is stuck high (1 trip detection logic*).
·

Wire harness or connector

·

ID code box (immobiliser code ECU)

·

ECM


DTC output confirmation operation:

Turn the engine switch on (IG) and wait 6 seconds.



*: 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 (initial ignition occurs and engine cranks, then ignition stops) Engine cannot be started

Related Data List and Active Test
DTC No. Data List and Active Test
B279A -

WIRING DIAGRAM

B352074E03
1.135,1.844 1.5,2.031 0.365,0.188 10 false ECM 1.802,1 2.26,1.198 0.458,0.198 10 false A40 1.823,0.802 2.135,1 0.313,0.198 10 false 28 1.479,1 1.75,1.188 0.271,0.188 10 false IMI 5.448,0.99 5.844,1.167 0.396,0.177 10 false EFIO 5.25,0.833 5.521,1.021 0.271,0.188 10 false 4 5.156,1.792 5.615,2.021 0.458,0.229 10 false E106 5.156,1.938 6.74,2.448 1.583,0.51 10 false ID Code Box (Immobiliser Code ECU)

CAUTION / NOTICE / HINT

NOTICE:
·

When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

·

Before replacing the ID code box (immobiliser code ECU) or ECM refer to Service Bulletin.

·

After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".



HINT:

When DTC B279A and a certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) DTC.


PROCEDURE

1.CLEAR DTC
a.

Clear the DTCs.

Powertrain > Engine and ECT > Clear DTCs
50002 234

Result:
Proceed to
NEXT



NEXT

2.CHECK FOR DTC
2.CHECK FOR DTC
a.

Turn the engine switch on (IG) and wait 10 seconds.


b.

Perform "DTC Output Confirmation Operation" procedure.


c.

Check for DTCs.

Powertrain > Engine and ECT > Trouble Codes
50001 234
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



A

3.CHECK CONNECTION OF CONNECTOR

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>IMMOBILISER SYSTEM(w/ Smart Entry and Start System)>DIAGNOSTIC TROUBLE CODE CHART


3.CHECK CONNECTION OF CONNECTOR
a.

Turn the engine switch off.


b.

Check that the connectors are properly connected to the ECM and ID code box (immobiliser code ECU).

OK:

Connectors are properly connected.



Result:
Proceed to
OK
NG



OK

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

NG

CONNECT CONNECTORS PROPERLY

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

Disconnect the E106 ID code box (immobiliser code ECU) connector.


b.

Disconnect the A40 ECM connector.


c.

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


Standard Resistance:
Tester Connection Condition Specified Condition
A40-28 (IMI) - E106-4 (EFIO) Always Below 1 Ω
A40-28 (IMI) - Body ground Always 10 kΩ or higher
E106-4 (EFIO) - Body ground Always 10 kΩ or higher


Result:
Proceed to
OK
NG



OK

5.REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.REPLACE ID CODE BOX (IMMOBILISER CODE ECU)
a.

Replace the ID code box (immobiliser code ECU) with a new one.

HINT:

Refer to Service Bulletin.



Result:
Proceed to
NEXT



NEXT

6.REGISTER RECOGNITION CODES
6.REGISTER RECOGNITION CODES
a.

Register the recognition codes in the ECUs.

HINT:

Refer to Service Bulletin.



Result:
Proceed to
NEXT



NEXT

7.REGISTER ECU COMMUNICATION ID
7.REGISTER ECU COMMUNICATION ID
a.

Register the ECU communication ID.

HINT:

Refer to Service Bulletin.



Result:
Proceed to
NEXT



NEXT

8.CLEAR DTC
8.CLEAR DTC
a.

Clear the DTCs.

Powertrain > Engine and ECT > Clear DTCs
50002 234

Result:
Proceed to
NEXT



NEXT

9.CHECK FOR DTC
9.CHECK FOR DTC
a.

Perform "DTC Output Confirmation Operation" procedure.


b.

Check for DTCs.

Powertrain > Engine and ECT > Trouble Codes
50001 234
HINT:

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


OK:

DTC B279A is not output.



Result:
Proceed to
OK
NG



OK

END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE)

NG

REPLACE ECM

Click hereEngine / Hybrid System>2ZR-FE ENGINE CONTROL>ECM>REMOVAL