RM35X0E _58 Vehicle Interior _078378 THEFT DETERRENT / KEYLESS ENTRY _0386642 IMMOBILISER SYSTEM(w/o Entry and Start System) C

THEFT DETERRENT / KEYLESS ENTRY  IMMOBILISER SYSTEM(w/o Entry and Start System)  B279A12  Engine Immobiliser System Circuit Short to Battery  


DESCRIPTION

If the communication line (IMI - EFIO) between the ECM and transponder key ECU assembly 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 Communication line (EFIO-IMI) between the ECM and transponder key ECU assembly is stuck high.
·

Wire harness or connector

·

ECM

·

Transponder key ECU assembly


DTC Output Confirmation Operation:

Turn the ignition switch to ON and wait 6 seconds.



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
B279A12 -

WIRING DIAGRAM

B499509E14
0.479,1.885 3.115,2.25 2.635,0.365 10 false Transponder Key ECU Assembly 0.49,1.729 0.958,1.969 0.469,0.24 10 false N66 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 11 5.188,1.917 5.667,2.135 0.479,0.219 10 false ECM 5.125,0.75 5.594,0.99 0.469,0.24 10 false IMI 4.427,0.667 5.031,0.865 0.604,0.198 10 false 8*1, 16*2 6.354,0.385 6.823,0.625 0.469,0.24 10 false +B 5.156,1.729 6.813,2.031 1.656,0.302 10 false A1*1, A2*2 3.167,2.083 5.458,2.281 2.292,0.198 10 false *1: for 7GR-FKS 3.177,2.406 5.469,2.604 2.292,0.198 10 false *2: for 1GD-FTV

CAUTION / NOTICE / HINT

NOTICE:
·

Before replacing the transponder key ECU assembly or ECM, refer to the Service Bulletin.

·

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



PROCEDURE

1.CHECK CONNECTION OF CONNECTOR
a.

Turn the ignition switch off.


b.

Check that the connectors are properly connected to the ECM and transponder key ECU assembly.

OK:

Connectors are properly connected.



Result:
Proceed to
OK
NG



OK

2.CHECK ECM (TERMINAL EFIO)

NG

CONNECT CONNECTORS PROPERLY

2.CHECK ECM (TERMINAL EFIO)
a.

Using an oscilloscope, check the waveform.

B463095C15
3.396,0.385 3.781,0.656 0.385,0.271 3,2.323 3.25,2.323 3.25,2.323 3.25,1.573 false 3.042,4.573 3.292,4.573 3.292,4.573 3.292,4.083 false 3.729,4.573 3.469,4.573 3.469,4.573 3.469,4.083 false 0.375,0.125 0.688,0.323 0.313,0.198 10 false *a 3.469,0.438 3.781,0.635 0.313,0.198 10 false N66 2.646,2.24 3.104,2.469 0.458,0.229 10 false EFIO 3.333,3.021 3.792,3.25 0.458,0.229 10 false *b 0.958,4.042 1.417,4.271 0.458,0.229 10 false GND 2.875,4.49 3.135,4.677 0.26,0.188 10 false *c 3.781,4.49 4.042,4.677 0.26,0.188 10 false *d
*a Component with harness connected
(Transponder Key ECU Assembly) 		*b Waveform
*c Approximately 160 ms. *d Approximately 270 ms.


Measurement Condition:
Tester Connection Condition Tool Setting Specified Condition
N66-11 (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 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 TRANSPONDER KEY ECU ASSEMBLY

B

3.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - 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 (TRANSPONDER KEY ECU ASSEMBLY - ECM)
a.

for 7GR-FKS:

Disconnect the A1 ECM connector.


b.

for 1GD-FTV:

Disconnect the A2 ECM connector.


c.

Disconnect the N66 transponder key ECU assembly connector.


d.

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

Standard Resistance:
for 7GR-FKS
Tester Connection Condition Specified Condition
N66-11 (EFIO) - A1-8 (IMI) Always Below 1 Ω

for 1GD-FTV
Tester Connection Condition Specified Condition
N66-11 (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