RM38T0EC _58 Vehicle Interior _115230 THEFT DETERRENT / KEYLESS ENTRY _0512195 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 (EFIO-IMI) to the transponder key ECU assembly is stuck high (e.g. shorted to +B), the ECM stores 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

Production Date from 2022/01 to 2023/04



E366880E48
5.052,0.833 5.365,1.031 0.313,0.198 10 false 11 1.813,0.833 2.219,1.031 0.406,0.198 10 false IMI 0.917,1.969 2.125,2.208 1.208,0.24 10 false A47 5.25,2.115 6.635,2.625 1.385,0.51 10 false Transponder Key ECU Assembly 2.104,0.833 2.875,1.063 0.771,0.229 10 false 26 5.302,0.844 5.708,1.042 0.406,0.198 10 false EFIO 1.323,0.385 1.74,0.594 0.417,0.208 10 false 12 V 5.24,1.948 5.646,2.146 0.406,0.198 10 false I67 0.917,2.146 1.417,2.365 0.5,0.219 10 false ECM

Production Date from 2023/04



E366880E53
5.052,0.833 5.365,1.031 0.313,0.198 10 false 11 1.813,0.833 2.219,1.031 0.406,0.198 10 false IMI 0.917,1.969 2.125,2.208 1.208,0.24 10 false A182 5.25,2.115 6.635,2.625 1.385,0.51 10 false Transponder Key ECU Assembly 2.104,0.833 2.875,1.063 0.771,0.229 10 false 54 5.302,0.844 5.708,1.042 0.406,0.198 10 false EFIO 1.323,0.385 1.74,0.594 0.417,0.208 10 false 12 V 5.24,1.948 5.646,2.146 0.406,0.198 10 false I67 0.917,2.146 1.417,2.365 0.5,0.219 10 false ECM

CAUTION / NOTICE / HINT

NOTICE:
·

If the transponder key ECU assembly or ECM is replaced, refer to Service Bulletin.

·

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



PROCEDURE

1.CONFIRM MODEL
a.

Choose the model to be inspected.


Result:
Result Proceed to
Production date from 2022/01 to 2023/04 A
Production date from 2023/04 B



A

2.CHECK CONNECTION OF CONNECTOR

B

6.CHECK CONNECTION OF CONNECTOR
2.CHECK CONNECTION OF CONNECTOR
a.

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

3.CHECK ECM

NG

CONNECT CONNECTORS PROPERLY

3.CHECK ECM
a.

Disconnect the I67 transponder key ECU assembly connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
I67-11 (EFIO) - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

4.CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)

NG

5.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)
4.CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)
a.

Connect the transponder key ECU assembly connector.


b.

Using an oscilloscope, check the waveform.

B463095C25
3.396,0.385 3.781,0.656 0.385,0.271 2.958,2.24 3.24,1.573 true 3.031,4.563 3.302,4.094 true 3.719,4.563 3.479,4.094 true 0.375,0.125 0.688,0.323 0.313,0.198 10 false *a 3.49,0.427 3.802,0.625 0.313,0.198 10 false I67 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.


OK:
Tester Connection Condition Tool Setting Specified Condition
I67-11 (EFIO) - Body ground Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) auxiliary battery terminal 2 V/DIV., 500 ms./DIV. Pulse generation
(See waveform)



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>M20A-FKS, M20C-FKS, M20E-FKS (ENGINE CONTROL)>ECM>REMOVAL


NG

REPLACE TRANSPONDER KEY ECU ASSEMBLY

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

Disconnect the A47 ECM connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I67-11 (EFIO) - A47-26 (IMI) Always Below 1 Ω
I67-11 (EFIO) or A47-26 (IMI) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>M20A-FKS, M20C-FKS, M20E-FKS (ENGINE CONTROL)>ECM>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.CHECK CONNECTION OF CONNECTOR
a.

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

7.CHECK ECM

NG

CONNECT CONNECTORS PROPERLY

7.CHECK ECM
a.

Disconnect the I67 transponder key ECU assembly connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
I67-11 (EFIO) - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

8.CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)

NG

9.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)
8.CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)
a.

Connect the transponder key ECU assembly connector.


b.

Using an oscilloscope, check the waveform.

B463095C25
3.396,0.385 3.781,0.656 0.385,0.271 2.958,2.24 3.24,1.573 true 3.031,4.563 3.302,4.094 true 3.719,4.563 3.479,4.094 true 0.375,0.125 0.688,0.323 0.313,0.198 10 false *a 3.49,0.427 3.802,0.625 0.313,0.198 10 false I67 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.


OK:
Tester Connection Condition Tool Setting Specified Condition
I67-11 (EFIO) - Body ground Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) auxiliary battery terminal 2 V/DIV., 500 ms./DIV. Pulse generation
(See waveform)



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>M20A-FKS, M20C-FKS, M20E-FKS (ENGINE CONTROL)>ECM>REMOVAL


NG

REPLACE TRANSPONDER KEY ECU ASSEMBLY

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

Disconnect the A182 ECM connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I67-11 (EFIO) - A182-54 (IMI) Always Below 1 Ω
I67-11 (EFIO) or A182-54 (IMI) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>M20A-FKS, M20C-FKS, M20E-FKS (ENGINE CONTROL)>ECM>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR