RM3660EC _58 Vehicle Interior _080747 THEFT DETERRENT / KEYLESS ENTRY _0586354 SMART ENTRY AND START SYSTEM(for Start Function, Gasoline Model (NR Series)) C

THEFT DETERRENT / KEYLESS ENTRY SMART ENTRY AND START SYSTEM(for Start Function, Gasoline Model (NR Series)) B279A12 Engine Immobiliser System Circuit Short to Battery

DESCRIPTION

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B279A12	Engine Immobiliser System Circuit Short to Battery	The communication line (IMI - EFIO) between the ECM and ID code box (immobiliser code ECU) is stuck high. (1 trip detection logic*)	· ID code box (immobiliser code ECU) · ECM · Wire harness or connector	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	Engine cannot be started

Related Data List and Active Test
DTC No.	Data List and Active Test
B279A12	-

WIRING DIAGRAM

1.052,1.875 3.042,2.521 1.99,0.646 10 false ECM 1.063,1.719 2.479,2 1.417,0.281 10 false A46 0.792,0.219 1.25,0.417 0.458,0.198 10 false 12 V 1.865,0.729 2.323,0.927 0.458,0.198 10 false IMI 2.177,0.719 3.281,1.031 1.104,0.313 10 false 28 4.917,0.719 5.375,0.917 0.458,0.198 10 false 4 5.135,0.719 5.594,0.917 0.458,0.198 10 false EFIO 5.115,1.698 5.573,1.896 0.458,0.198 10 false I20 5.115,1.854 6.688,2.396 1.573,0.542 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.

·

The smart entry and start system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM (for Start Function, Gasoline Model (NR Series))>HOW TO PROCEED WITH TROUBLESHOOTING202304,999999,_58,_080747,_0586354,RM1000000029OG1,

·

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

·

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

HINT:: When DTC B279A12 and the certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) DTC.

PROCEDURE

1.CHECK CONNECTION OF CONNECTOR

Turn the engine switch off.

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

2.CHECK WHETHER ENGINE STARTS

CONNECT CONNECTORS PROPERLY

2.CHECK WHETHER ENGINE STARTS

Check that the engine starts.

OK:: Engine starts normally.

Result:

Proceed to
OK
NG

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING201906,999999,_V1,_080724,_0393250,RM100000001HWSQ,

3.CHECK ECM (TERMINAL EFIO)

1.49,0.365 1.948,0.615 0.458,0.25 1.021,1.604 1.229,1.604 1.229,1.604 1.521,1.177 true 0.156,0.115 0.927,0.76 0.771,0.646 10 false *a 1.635,0.406 2.406,1.052 0.771,0.646 10 false I20 0.667,1.521 1.354,1.781 0.688,0.26 10 false EFIO

*a	Component with harness connected (ID Code Box (Immobiliser Code ECU))

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
I20-4 (EFIO) - Body ground	Engine switch on (IG)	11 to 14 V

Result:

Proceed to
OK
NG

4.CHECK ID CODE BOX (IMMOBILISER CODE ECU) (TERMINAL EFIO)

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

4.CHECK ID CODE BOX (IMMOBILISER CODE ECU) (TERMINAL EFIO)

Using an oscilloscope, check the waveform.

3.281,0.052 3.76,0.271 0.479,0.219 3.344,0.833 2.844,1.26 2.844,1.26 2.698,1.26 true 3.583,3.531 3.417,3.531 3.417,3.531 3.417,3.031 true 3.073,3.542 3.24,3.542 3.24,3.542 3.24,3.042 true 2.625,0.25 2.885,0.458 0.26,0.208 10 false *a 3.25,1.969 3.563,2.125 0.313,0.156 10 false *b 2.917,3.469 3.229,3.625 0.313,0.156 10 false *c 3.615,3.469 3.927,3.625 0.313,0.156 10 false *d 0.927,2.99 1.24,3.146 0.313,0.156 10 false GND 3.427,0.073 4.031,0.469 0.604,0.396 10 false I20 2.344,1.177 2.76,1.375 0.417,0.198 10 false EFIO

*a	Component with harness connected (ID Code Box (Immobiliser Code ECU))	*b	Waveform
*c	Approximately 160 ms.	*d	Approximately 270 ms.

OK:

Tester Connection	Condition	Tool Setting	Specified Condition
I20-4 (EFIO) - Body ground	Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after cable disconnected and reconnected to battery	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform)

Result:

Proceed to
OK
NG

REPLACE ECM

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>ECM>REMOVAL202304,999999,_51,_080777,_0392337,RM100000002BCAH,

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

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

Disconnect the A46 ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I20-4 (EFIO) - A46-28 (IMI)	Always	Below 1 Ω

Result:

Proceed to
OK
NG

REPLACE ECM

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>ECM>REMOVAL202304,999999,_51,_080777,_0392337,RM100000002BCAH,

REPAIR OR REPLACE HARNESS OR CONNECTOR