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


DESCRIPTION

If there is a communication malfunction between the ECM and transponder key ECU assembly, 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 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.


·

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 (-) 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

C375433E61
5.344,2.802 7,3.021 1.656,0.219 10 false A125*1, A116*2 5.333,2.979 6.052,3.24 0.719,0.26 10 false ECM 5.792,1.25 6.25,1.448 0.458,0.198 10 false +B 5.344,0.781 5.802,0.979 0.458,0.198 10 false IMO 5.302,1.729 5.76,1.927 0.458,0.198 10 false IMI 5.063,0.76 5.74,0.958 0.677,0.198 10 false 55 5.021,1.74 5.771,1.938 0.75,0.198 10 false 54 1.583,0.823 2.042,1.021 0.458,0.198 10 false EFII 1.521,1.729 1.979,1.927 0.458,0.198 10 false EFIO 1.969,0.802 2.427,1 0.458,0.198 10 false 10 1.979,1.729 2.438,1.927 0.458,0.198 10 false 11 0.281,2.802 0.74,3 0.458,0.198 10 false G52 0.281,2.979 2.573,3.198 2.292,0.219 10 false Transponder Key ECU Assembly 0.688,0.25 1.146,0.448 0.458,0.198 10 false +B 2.667,2.948 4.958,3.167 2.292,0.219 10 false *1: for GTMC Made 2.667,3.313 4.958,3.531 2.292,0.219 10 false *2: for SFTM 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".



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.

Register the ECU communication ID.

HINT:

Refer to Service Bulletin.



Result:
Proceed to
NEXT



NEXT

2.CHECK ECM (TERMINAL EFII)
2.CHECK ECM (TERMINAL EFII)
a.

Using an oscilloscope, check the waveform.

B463094C09
3.417,0.333 3.833,0.604 0.417,0.271 3.115,2.479 3.365,2.479 3.365,2.479 3.365,1.563 false 2.667,4.604 2.875,4.604 2.875,4.604 2.875,4.104 false 3.313,4.604 3.063,4.604 3.063,4.604 3.063,4.104 false 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 3.51,0.385 3.948,0.656 0.438,0.271 10 false G52 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.



Measurement Condition:
Tester Connection Condition Tool Setting Specified Condition
G52-10 (EFII) - 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
Normal waveform A
Terminal EFII stuck low (2.4 V or less) B
Waveform length or shape is abnormal, or EFII terminal stuck at Hi (12 V) C



A

3.CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)

B

6.CHECK ECM (TERMINAL IMO)

C

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

Using an oscilloscope, check the waveform.

B463095C13
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 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:
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.

HINT:

Refer to Service Bulletin.



Result:
Proceed to
NEXT



NEXT

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

Check that the engine starts.


Result:
Result Proceed to
Engine was started A
Engine was not started B



A

END (ECU COMMUNICATION ID HAS NOT BEEN REGISTERED)

B

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


6.CHECK ECM (TERMINAL IMO)
a.
C503162C01
1.479,0.188 1.927,0.438 0.448,0.25 1.479,0.531 1.927,0.781 0.448,0.25 0.781,0.656 0.958,0.656 0.958,0.656 1.25,2.01 true 1.542,0.229 2,0.427 0.458,0.198 10 false A125 0.125,0.135 0.583,0.333 0.458,0.198 10 false *a 1.979,0.229 2.438,0.427 0.458,0.198 10 false *A 1.542,0.573 2,0.771 0.458,0.198 10 false A116 0.5,0.573 0.958,0.771 0.458,0.198 10 false IMO 2,0.573 2.458,0.771 0.458,0.198 10 false *B
*A for GTMC Made
*B for SFTM Made
*a Front view of wire harness connector
(to ECM)


Disconnect the ECM connector.


b.

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

Standard Voltage:
for GTMC Made:
Tester Connection Switch Condition Specified Condition
A125-55 (IMO) - Body ground Ignition switch turned 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

for SFTM Made
Tester Connection Switch Condition Specified Condition
A116-55 (IMO) - Body ground Ignition switch turned 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



A

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

B

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


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

Disconnect the G52 transponder key ECU assembly connector.


b.

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

Standard Resistance:
for GTMC Made:
Tester Connection Condition Specified Condition
G52-10 (EFII) - A125-55 (IMO) Always Below 1 Ω
G52-10 (EFII) or A125-55 (IMO) - Other terminals and body ground Always 10 kΩ or higher

for SFTM Made:
Tester Connection Condition Specified Condition
G52-10 (EFII) - A116-55 (IMO) Always Below 1 Ω
G52-10 (EFII) or A116-55 (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

8.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
G52-10 (EFII) - A125-55 (IMO) Always Below 1 Ω
G52-10 (EFII) or A125-55 (IMO) - Other terminals and body ground Always 10 kΩ or higher

for SFTM Made:
Tester Connection Condition Specified Condition
G52-10 (EFII) - A116-55 (IMO) Always Below 1 Ω
G52-10 (EFII) or A116-55 (IMO) - Other terminals and body ground Always 10 kΩ or higher



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