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)  B279986  Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid  


DESCRIPTION

If there is a communication malfunction between the ECM and ID code box (immobiliser code ECU), or when the communication ID codes do not match, the ECM stores this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B279986 Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid Either of the following conditions is met (1 trip detection logic*):
·

A malfunction is detected in the communication or communication lines between the ECM and ID code box (immobiliser code ECU).

·

The communication ID codes of the ECM and ID code box (immobiliser code ECU) do not match.


·

ID code box (immobiliser code ECU)

·

ECM

·

Harness or connector


DTC output confirmation operation (Perform either of the following):
·

Start the engine and wait for 10 seconds. If there is a malfunction, the engine will stop (communication begins within 3 seconds of the engine start operation being performed, and DTCs are stored after 6 seconds).

·

Connect the cable to the negative (-) auxiliary battery terminal, start the engine and wait for 10 seconds (communication begins within 3 seconds of the ignition switch being turned to ON, and DTCs are stored after 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 -

Related Data List and Active Test
DTC No. Data List and Active Test
B279986 -

WIRING DIAGRAM

B680276E03
0.458,2.99 2.042,3.563 1.583,0.573 10 false ID Code Box (Immobiliser Code ECU) 5.844,2.823 6.302,3.021 0.458,0.198 10 false A109 0.458,2.823 0.917,3.021 0.458,0.198 10 false E55 0.833,0.156 1.292,0.354 0.458,0.198 10 false +B 6.219,1.531 6.677,1.729 0.458,0.198 10 false +B 1.74,0.583 2.198,0.781 0.458,0.198 10 false EFII 1.677,1.813 2.135,2.01 0.458,0.198 10 false EFIO 2.125,0.583 2.583,0.781 0.458,0.198 10 false 3 2.125,1.813 2.583,2.01 0.458,0.198 10 false 4 5.427,0.583 5.885,0.781 0.458,0.198 10 false IMO 5.448,1.823 5.906,2.021 0.458,0.198 10 false IMI 5.146,0.583 5.604,0.781 0.458,0.198 10 false 55 5.135,1.823 5.594,2.021 0.458,0.198 10 false 54 6.25,2.833 6.896,3.188 0.646,0.354 10 false ECM

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 Service Bulletin.

·

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



HINT:

When DTC B279986 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.REGISTER ECU COMMUNICATION ID
a.

Register the ECU communication ID code.

HINT:

Refer to Service Bulletin.


Result:
Proceed to
NEXT




NEXT

2.CHECK ID CODE BOX (IMMOBILISER CODE ECU) (TERMINAL EFII)
2.CHECK ID CODE BOX (IMMOBILISER CODE ECU) (TERMINAL EFII)
a.

Using an oscilloscope, check the waveform.

C379326C33
3.302,0.104 3.688,0.323 0.385,0.219 3.198,3.552 3.031,3.552 3.031,3.552 3.031,3.042 true 2.667,3.563 2.833,3.563 2.833,3.563 2.833,3.052 true 3.906,1.49 3.74,1.49 3.74,1.49 3.521,0.938 true 2.458,0.302 2.771,0.458 0.313,0.156 10 false *a 2.854,2.063 3.167,2.219 0.313,0.156 10 false *b 2.49,3.469 2.802,3.625 0.313,0.156 10 false *c 3.26,3.479 3.573,3.635 0.313,0.156 10 false *d 0.854,3 1.167,3.156 0.313,0.156 10 false GND 3.969,1.406 4.333,1.583 0.365,0.177 10 false EFII 3.375,0.125 4.083,0.563 0.708,0.438 10 false E55
*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)

E55-3 (EFII) - Body ground Within 3 seconds of the engine start operation being performed or within 3 seconds of the ignition switch being turned to ON after connecting the cable to the negative (-) auxiliary battery terminal 2 V/DIV., 500 ms./DIV. Pulse generation
(See waveform)


Result:
Result Proceed to
Normal waveform A
Terminal EFII stuck low (2.4 V or less) B
Waveform not output, or has abnormal wavelength or shape, or terminal EFII stuck high (12 V) C




A

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

B

7.CHECK ECM

C

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

Using an oscilloscope, check the waveform.

C379327C64
3.323,0.073 3.75,0.292 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 2.573,0.25 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 2.896,3.448 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 0.865,2.99 1.177,3.146 0.313,0.156 10 false GND 3.417,0.094 3.833,0.323 0.417,0.229 10 false E55 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

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 the engine start operation being performed or within 3 seconds of the ignition switch being turned to ON after connecting the cable to the negative (-) auxiliary battery terminal 2 V/DIV., 500 ms./DIV. Pulse generation
(See waveform)


Result:
Proceed to
OK
NG




OK

4.REGISTER ECU COMMUNICATION ID (ID CODE BOX (IMMOBILISER CODE ECU) - ECM)

NG

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

Register the ECU communication ID codes.

HINT:

Refer to Service Bulletin.


Result:
Proceed to
NEXT




NEXT

5.CHECK WHETHER ENGINE STARTS
5.CHECK WHETHER ENGINE STARTS

Pre-procedure1

a.

Using an electrical key transmitter sub-assembly which is registered to the vehicle, turn the ignition switch to ON.


Procedure1

b.

Check that the engine can be started 5 seconds after the ignition switch turned to ON.

OK:

Engine starts normally.


Result:
Proceed to
OK
NG



Post-procedure1

c.

None



OK

END (ECU COMMUNICATION ID HAS NOT BEEN REGISTERED)

NG

REPLACE ECM

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


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

Pre-procedure1

a.

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


b.

Disconnect the A109 ECM 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
A109-54 (IMI) or E55-4 (EFIO) - Other terminals and body ground Always 10 kΩ or higher


Result:
Proceed to
OK
NG



Post-procedure1

d.

None



OK

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.CHECK ECM

Pre-procedure1

a.

Disconnect the A109 ECM connector.


Procedure1

b.

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

Standard Voltage:
Tester Connection Condition Specified Condition

Click Location & Routing(A109)Location & Routing

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

A109-55 (IMO) - Body ground Ignition switch turned to ON using registered electrical key transmitter sub-assembly Terminal IMO stuck low (2.4 V or less)
Terminal IMO stuck high (12 V) or abnormal waveform


Result:
Result Proceed to
Terminal IMO stuck low (2.4 V or less) A
Terminal IMO stuck high (12 V) or abnormal waveform B



Post-procedure1

c.

None



A

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

B

REPLACE ECM

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


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

Pre-procedure1

a.

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


Procedure1

b.

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)

A109-55 (IMO) - E55-3 (EFII) Always Below 1 Ω
A109-55 (IMO) or E55-3 (EFII) - Other terminals and body ground Always 10 kΩ or higher
A109-54 (IMI) - E55-4 (EFIO) Always Below 1 Ω
A109-54 (IMI) or E55-4 (EFIO) - Other terminals and body ground Always 10 kΩ or higher


Result:
Proceed to
OK
NG



Post-procedure1

c.

None



OK

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Pre-procedure1

a.

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


b.

Disconnect the A109 ECM 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)

A109-55 (IMO) - E55-3 (EFII) Always Below 1 Ω
A109-55 (IMO) or E55-3 (EFII) - Other terminals and body ground Always 10 kΩ or higher


Result:
Proceed to
OK
NG



Post-procedure1

d.

None



OK

REPLACE ECM

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR