RM35X0E _58 Vehicle Interior _078378 THEFT DETERRENT / KEYLESS ENTRY _0397001 ENTRY AND START SYSTEM(for Start Function) C

THEFT DETERRENT / KEYLESS ENTRY  ENTRY AND START SYSTEM(for Start Function)  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*).
·

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 Engine cannot be started

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

WIRING DIAGRAM

B499509E15
0.479,1.885 3.115,2.25 2.635,0.365 10 false ID Code Box (Immobiliser Code ECU) 0.49,1.729 0.958,1.969 0.469,0.24 10 false N158 1.781,0.729 2.25,0.969 0.469,0.24 10 false EFIO 2.177,0.729 2.646,0.969 0.469,0.24 10 false 4 5.083,1.906 5.563,2.125 0.479,0.219 10 false ECM 5.094,1.698 6.021,1.906 0.927,0.208 10 false A1*1, A2*2 5.125,0.75 5.594,0.99 0.469,0.24 10 false IMI 4.458,0.729 5.167,0.938 0.708,0.208 10 false 8*1, 16*2 6.354,0.385 6.823,0.625 0.469,0.24 10 false +B 3.042,2.271 4.781,2.49 1.74,0.219 10 false *1: for 7GR-FKS 3.052,2.521 4.792,2.74 1.74,0.219 10 false *2: for 1GD-FTV

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. 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 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 entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>ENTRY AND START SYSTEM (for Start Function)>HOW TO PROCEED WITH TROUBLESHOOTING

·

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

·

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



HINT:

When DTC B279A12 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.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:
Result Proceed to
The connectors are properly connected A
The connectors are not properly connected B



A

2.CHECK ECM (TERMINAL EFIO)

B

CONNECT CONNECTORS PROPERLY

2.CHECK ECM (TERMINAL EFIO)
a.

Using an oscilloscope, check the waveform.

C379327C45
3.271,0.042 3.646,0.229 0.375,0.188 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 2.573,0.25 2.885,0.406 0.313,0.156 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 0.875,2.99 1.188,3.146 0.313,0.156 10 false GND 3.302,0.063 3.75,0.281 0.448,0.219 10 false N158 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.


Measurement Condition:
Tester Connection Condition Tool Setting Specified Condition
N158-4 (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:
Result Proceed to
11 to 14 V A
Below 1 V B
Normal waveform C



A

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

B

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

C

REPLACE ECM

for 7GR-FKS:

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>ECM>REMOVAL

for 1GD-FTV:

Click hereEngine / Hybrid System>1GD-FTV (ENGINE CONTROL)>ECM>REMOVAL


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

for 7GR-FKS:

Disconnect the A1 ECM connector.


b.

for 1GD-FTV:

Disconnect the A2 ECM connector.


c.

Disconnect the N158 ID code box (immobiliser code ECU) connector.


d.

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

Standard Resistance:
for 7GR-FKS
Tester Connection Condition Specified Condition
N158-4 (EFIO) - A1-8 (IMI) Always Below 1 Ω


for 1GD-FTV
Tester Connection Condition Specified Condition
N158-4 (EFIO) - A2-16 (IMI) Always Below 1 Ω


Result:
Proceed to
OK
NG



OK

REPLACE ECM

for 7GR-FKS:

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>ECM>REMOVAL

for 1GD-FTV:

Click hereEngine / Hybrid System>1GD-FTV (ENGINE CONTROL)>ECM>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR