RM36D0EC _58 Vehicle Interior _083094 THEFT DETERRENT / KEYLESS ENTRY _0403001 IMMOBILISER SYSTEM(w/o Smart Entry and Start System) C

THEFT DETERRENT / KEYLESS ENTRY  IMMOBILISER SYSTEM(w/o Smart 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.
·

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

C375434E18
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 G52 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 5.083,1.906 5.563,2.125 0.479,0.219 10 false ECM 5.094,1.698 6.958,1.979 1.865,0.281 10 false A125*1, A116*2 5.125,0.75 5.594,0.99 0.469,0.24 10 false IMI 4.854,0.729 5.563,0.938 0.708,0.208 10 false 54 6.354,0.385 6.823,0.625 0.469,0.24 10 false +B 2.802,2.313 5.438,2.677 2.635,0.365 10 false *2: for SFTM Made 2.802,1.917 5.438,2.281 2.635,0.365 10 false *1: for GTMC Made

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.


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.

B463095C14
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 3.458,0.438 3.771,0.635 0.313,0.198 10 false G52 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
G52-11 (EFIO) - Body ground Within 3 seconds of engine start or within 3 seconds of ignition switch turned 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 M20D-FKS: Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>ECM>REMOVAL

for M20C-FKS: Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>ECM>REMOVAL


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

Disconnect the A125*1, A116*2 ECM connector.

*1: for GTMC Made

*2: for SFTM Made



b.

Disconnect the G52 transponder key ECU assembly connector.


c.

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

Standard Resistance:
for GTMC Made:
Tester Connection Condition Specified Condition
G52-11 (EFIO) - A125-54 (IMI) Always Below 1 Ω

for SFTM Made:
Tester Connection Condition Specified Condition
G52-11 (EFIO) - A116-54 (IMI) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE ECM

for M20D-FKS: Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>ECM>REMOVAL

for M20C-FKS: Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>ECM>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR