RM38N0EC _58 Vehicle Interior _111832 THEFT DETERRENT / KEYLESS ENTRY _0509385 SMART ENTRY AND START SYSTEM(for Start Function, Gasoline Model) C

THEFT DETERRENT / KEYLESS ENTRY  SMART ENTRY AND START SYSTEM(for Start Function, Gasoline Model)  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 ignition switch to ON 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

B543253E62
5.979,1.594 6.573,2.052 0.594,0.458 10 false ECM 5.521,1.594 5.979,1.792 0.458,0.198 10 false A109 5.906,0.271 6.365,0.469 0.458,0.198 10 false +B 5.146,0.583 5.604,0.781 0.458,0.198 10 false IMI 4.844,0.583 5.302,0.781 0.458,0.198 10 false 54 2.198,0.563 2.656,0.76 0.458,0.198 10 false 4 1.74,0.573 2.198,0.771 0.458,0.198 10 false EFIO 0.5,1.594 0.958,1.792 0.458,0.198 10 false E55 0.5,1.76 2.094,2.25 1.594,0.49 10 false ID Code Box (Immobiliser Code ECU)

CAUTION / NOTICE / HINT

NOTICE:
·

When using the GTS with the ignition switch off, perform lock and unlock operations using the door control switch of the multiplex network master switch assembly at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins, and then select the vehicle model manually.

Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start (CAN). While using the GTS, periodically perform lock and unlock operations using the door control switch of the multiplex network master switch assembly 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)>HOW TO PROCEED WITH TROUBLESHOOTING

·

Before replacing the ECM or ID code box (immobiliser code ECU), refer to the 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

Pre-procedure1

a.

Turn the ignition switch off.


Procedure1

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



Post-procedure1

c.

None



OK

2.CHECK WHETHER ENGINE STARTS

NG

CONNECT CONNECTORS PROPERLY

2.CHECK WHETHER ENGINE STARTS
a.

Check that the engine starts.

OK:

Engine starts normally.


Result:
Proceed to
OK
NG




OK

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


NG

3.CHECK ECM (TERMINAL EFIO)
3.CHECK ECM (TERMINAL EFIO)
a.
B503616C10
1.531,0.313 1.938,0.563 0.406,0.25 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 1.615,0.354 2.385,1 0.771,0.646 10 false E55 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

Click Location & Routing(E55)Location & Routing

Click Connector(E55)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>ID Code Box (Immobiliser Code ECU)

E55-4 (EFIO) - Body ground Engine switch on (IG) 11 to 14 V


Result:
Proceed to
OK
NG




OK

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

NG

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

Using an oscilloscope, check the waveform.

C379327C65
3.313,0.063 3.74,0.281 0.427,0.219 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 3.25,1.958 3.563,2.115 0.313,0.156 10 false *b 2.896,3.448 3.208,3.604 0.313,0.156 10 false *c 3.635,3.448 3.948,3.604 0.313,0.156 10 false *d 0.875,2.99 1.188,3.146 0.313,0.156 10 false GND 3.406,0.094 4.01,0.49 0.604,0.396 10 false E55 2.323,1.177 2.74,1.375 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

Click Location & Routing(E55)Location & Routing

Click Connector(E55)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>ID Code Box (Immobiliser Code ECU)

E55-4 (EFIO) - Body ground Within 3 seconds of engine start or within 3 seconds of ignition switch turned to ON after cable disconnected and reconnected to auxiliary battery 2 V/DIV., 500 ms./DIV. Pulse generation
(See waveform)


Result:
Proceed to
OK
NG




OK

REPLACE ECM

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>ECM>REMOVAL


NG

REPLACE ID CODE BOX (IMMOBILIZER CODE ECU)

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

Pre-procedure1

a.

Disconnect the A109 ECM connector.


b.

Disconnect the E55 ID code box (immobiliser code ECU) connector.


Procedure1

c.

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

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(A109,E55)Location & Routing

Click Connector(A109)Engine Compartment>Engine Room Main Wire / Transmission Wire>ECM

Click Connector(E55)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>ID Code Box (Immobiliser Code ECU)

A109-54 (IMI) - E55-4 (EFIO) Always Below 1 Ω


Result:
Proceed to
OK
NG



Post-procedure1

d.

None



OK

REPAIR OR REPLACE HARNESS OR CONNECTOR

NG

REPLACE ID CODE BOX (IMMOBILIZER CODE ECU)