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


DESCRIPTION

The ECM stores this DTC when a communication line between the ECM and transponder key ECU assembly is malfunctioning or the communication ID of the ECM and transponder key ECU assembly do not match.

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

Error in communication between ECM and transponder key ECU assembly.

·

Error in communication lines.

·

Communication ID is different during communication between ECM and transponder key ECU assembly.


·

Wire harness or connector

·

Transponder key ECU assembly

·

ECM


DTC Output Confirmation Operation:
·

Start the engine and wait 10 seconds.

·

After disconnecting and reconnecting the cable to the negative (-) auxiliary battery terminal, turn the ignition switch to ON and wait 10 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 -

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

WIRING DIAGRAM

Production Date from 2022/01 to 2023/04



E366879E65
1.615,0.99 2.073,1.188 0.458,0.198 10 false IMO 1.656,1.802 2.115,2 0.458,0.198 10 false IMI 1.969,0.99 2.969,1.313 1,0.323 10 false 25 1.969,1.813 3.01,2.167 1.042,0.354 10 false 26 5.042,1.021 5.5,1.219 0.458,0.198 10 false 10 5.042,1.823 5.5,2.021 0.458,0.198 10 false 11 5.302,1.021 5.76,1.219 0.458,0.198 10 false EFII 4.948,2.802 5.406,3 0.458,0.198 10 false I67 5.302,1.823 5.76,2.021 0.458,0.198 10 false EFIO 0.708,2.844 1.969,3.042 1.26,0.198 10 false A47 0.708,3.01 1.479,3.313 0.771,0.302 10 false ECM 4.938,2.958 6.969,3.479 2.031,0.521 10 false Transponder Key ECU Assembly 1.344,1.375 1.802,1.573 0.458,0.198 10 false 12 V 6.01,0.542 6.469,0.74 0.458,0.198 10 false 12 V

Production Date from 2023/04



E366879E74
1.615,0.99 2.073,1.188 0.458,0.198 10 false IMO 1.656,1.802 2.115,2 0.458,0.198 10 false IMI 1.969,0.99 2.969,1.313 1,0.323 10 false 55 1.969,1.813 3.01,2.167 1.042,0.354 10 false 54 5.042,1.021 5.5,1.219 0.458,0.198 10 false 10 5.042,1.823 5.5,2.021 0.458,0.198 10 false 11 5.302,1.021 5.76,1.219 0.458,0.198 10 false EFII 4.948,2.802 5.406,3 0.458,0.198 10 false I67 5.302,1.823 5.76,2.021 0.458,0.198 10 false EFIO 0.708,2.844 1.969,3.042 1.26,0.198 10 false A182 0.708,3.01 1.479,3.313 0.771,0.302 10 false ECM 4.938,2.958 6.969,3.479 2.031,0.521 10 false Transponder Key ECU Assembly 1.344,1.375 1.802,1.573 0.458,0.198 10 false 12 V 6.01,0.542 6.469,0.74 0.458,0.198 10 false 12 V

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".



HINT:

If transponder key ECU assembly DTCs are output simultaneously, troubleshoot the transponder key ECU assembly DTCs first.


PROCEDURE

1.REGISTER ECU COMMUNICATION ID
a.

Reregister the ECU communication ID.


Result:
Proceed to
NEXT



NEXT

2.INSPECT TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFII)
2.INSPECT TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFII)
a.

Using an oscilloscope, check the waveform.

B463094C16
3.417,0.333 3.833,0.604 0.417,0.271 3.01,2.365 3.375,1.563 true 3.292,4.594 3.063,4.104 true 2.667,4.604 2.875,4.104 true 0.927,4.063 1.385,4.26 0.458,0.198 10 false GND 0.365,0.188 0.792,0.5 0.427,0.313 10 false *a 2.906,3.125 3.333,3.438 0.427,0.313 10 false *b 3.531,0.385 3.969,0.656 0.438,0.271 10 false I67 2.823,2.396 3.281,2.594 0.458,0.198 10 false EFII 2.5,4.51 2.813,4.729 0.313,0.219 10 false *c 3.354,4.521 3.667,4.74 0.313,0.219 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
I67-10 (EFII) - 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)

OK:

Waveform is similar to that shown in the illustration.


Result:
Result Proceed to
OK A
NG (Terminal EFII stuck low (2.4 V or less)) B
NG (Terminal EFII stuck high (12 V) or abnormal waveform) C



A

3.INSPECT TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)

B

6.CONFIRM MODEL

C

REPLACE ECM

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


3.INSPECT TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)
a.

Using an oscilloscope, check the waveform.

B463095C24
3.396,0.385 3.781,0.656 0.385,0.271 2.927,2.229 3.24,1.583 true 3.615,4.625 3.469,4.094 true 3.031,4.573 3.292,4.094 true 0.375,0.125 0.688,0.323 0.313,0.198 10 false *a 3.5,0.438 3.813,0.635 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 3.646,4.552 3.906,4.74 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)

OK:

Waveform is similar to that shown in the illustration.



Result:
Proceed to
OK
NG



OK

4.REGISTER ECU COMMUNICATION ID

NG

REPLACE TRANSPONDER KEY ECU ASSEMBLY

4.REGISTER ECU COMMUNICATION ID
a.

Reregister the ECU communication ID.


Result:
Proceed to
NEXT



NEXT

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

Using a registered door control transmitter assembly, turn the ignition switch to ON.


b.

Check that the engine starts 5 seconds after the ignition switch was turned to ON.

OK:

Engine starts normally.



Result:
Proceed to
OK
NG



OK

END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

NG

REPLACE ECM

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


6.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

7.INSPECT ECM (IMO TERMINAL VOLTAGE)

B

9.INSPECT ECM (IMO TERMINAL VOLTAGE)
7.INSPECT ECM (IMO TERMINAL VOLTAGE)
a.

Disconnect the A47 ECM connector.


b.

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

Standard Voltage:
Tester Connection Condition Result
A47-25 (IMO) - Body ground Ignition switch turned to ON using registered door control transmitter 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



A

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

B

REPLACE ECM

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


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

Disconnect the I67 transponder key ECU assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I67-10 (EFII) - A47-25 (IMO) Always Below 1 Ω
I67-10 (EFII) or A47-25 (IMO) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.INSPECT ECM (IMO TERMINAL VOLTAGE)
a.

Disconnect the A182 ECM connector.


b.

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

Standard Voltage:
Tester Connection Condition Result
A182-55 (IMO) - Body ground Ignition switch turned to ON using registered door control transmitter 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



A

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

B

REPLACE ECM

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


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

Disconnect the I67 transponder key ECU assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I67-10 (EFII) - A182-55 (IMO) Always Below 1 Ω
I67-10 (EFII) or A182-55 (IMO) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR