Last Modified: 07-31-2024 |
6.11:8.1.0 |
Doc ID: RM100000002BENJ |
Model Year Start: 2023 |
Model: GR Corolla |
Prod Date Range: [03/2023 -
] |
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): B279986; Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [03/2023 - ] |
DTC
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B279986
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Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid
|
DESCRIPTION
If there is a communication malfunction between the ECM and ID code box (immobiliser code ECU), or when the communication ID codes do not match, the ECM stores this DTC.
DTC No.
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Detection Item
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DTC Detection Condition
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Trouble Area
|
Note
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B279986
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Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid
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Either of the following conditions is met (1 trip detection logic*):
-
A malfunction is detected in the communication or communication lines between the ECM and ID code box (immobiliser code ECU).
-
The communication ID codes of the ECM and ID code box (immobiliser code ECU) do not match.
|
-
ID code box (immobiliser code ECU)
-
ECM
-
Harness or connector
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DTC output confirmation operation (Perform either of the following):
-
Start the engine and wait for 10 seconds. If there is a malfunction, the engine will stop (communication begins within 3 seconds of the engine start operation being performed, and DTCs are stored after 6 seconds).
-
Connect the cable to the negative (-) auxiliary battery terminal, start the engine and wait for 10 seconds (communication begins within 3 seconds of the ignition switch being turned to ON, and DTCs are stored after 6 seconds).
|
-
*: Only output while a malfunction is present.
Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected
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Fail-safe Operation when Malfunction Detected
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Engine cannot be started
|
-
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Related Data List and Active Test
DTC No.
|
Data List and Active Test
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B279986
|
-
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
When DTC B279986 and the certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) DTC.
PROCEDURE
1.
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REGISTER ECU COMMUNICATION ID
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(a) Register the ECU communication ID code.
Click here
NEXT
|
|
|
2.
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CHECK ID CODE BOX (IMMOBILISER CODE ECU) (TERMINAL EFII)
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(a) Using an oscilloscope, check the waveform.
*a
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Component with harness connected
(ID Code Box (Immobiliser Code ECU))
|
*b
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Waveform
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*c
|
Approximately 160 ms.
|
*d
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Approximately 270 ms.
|
OK:
Tester Connection
|
Condition
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Tool Setting
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Specified Condition
|
I20-3 (EFII) - Body ground
|
Within 3 seconds of the engine start operation being performed or within 3 seconds of the ignition switch being turned to ON after connecting the cable to the negative (-) auxiliary battery terminal
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2 V/DIV., 500 ms./DIV.
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Pulse generation
(See waveform)
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Result
|
Proceed to
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Normal waveform
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A
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Terminal EFII stuck low (2.4 V or less)
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B
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Waveform not output, or has abnormal wavelength or shape, or terminal EFII stuck high (12 V)
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C
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A
|
|
|
3.
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CHECK ID CODE BOX (IMMOBILISER CODE ECU) (TERMINAL EFIO)
|
(a) Using an oscilloscope, check the waveform.
*a
|
Component with harness connected
(ID Code Box (Immobiliser Code ECU))
|
*b
|
Waveform
|
*c
|
Approximately 160 ms.
|
*d
|
Approximately 270 ms.
|
Measurement Condition:
Tester Connection
|
Condition
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Tool Setting
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Specified Condition
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I20-4 (EFIO) - Body ground
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Within 3 seconds of the engine start operation being performed or within 3 seconds of the ignition switch being turned to ON after connecting the cable to the negative (-) auxiliary battery terminal
|
2 V/DIV., 500 ms./DIV.
|
Pulse generation
(See waveform)
|
OK
|
|
|
4.
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REGISTER ECU COMMUNICATION ID (ID CODE BOX (IMMOBILISER CODE ECU) - ECM)
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(a) Register the ECU communication ID codes.
Click here
NEXT
|
|
|
5.
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CHECK WHETHER ENGINE STARTS
|
Pre-procedure1
(a) Using an electrical key transmitter sub-assembly which is registered to the vehicle, turn the ignition switch to ON.
Procedure1
(b) Check that the engine can be started 5 seconds after the ignition switch turned to ON.
OK:
Engine starts normally.
Post-procedure1
(c) None
OK |
|
END (ECU COMMUNICATION ID HAS NOT BEEN REGISTERED)
|
NG |
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REPLACE ECM
for M20A-FKS: Click here
for G16E-GTS: Click here
|
6.
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CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM)
|
Pre-procedure1
(a) Disconnect the I20 ID code box (immobiliser code ECU) connector.
(b) Disconnect the A47*1, A178*2 or A139*3 ECM connector.
-
*1: for M20A-FKS (except K121 CVT)
-
*2: for M20A-FKS (K121 CVT)
-
*3: for G16E-GTS
Procedure1
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for M20A-FKS (except K121 CVT):
Tester Connection
|
Condition
|
Specified Condition
|
I20-4 (EFIO) - A47-26 (IMI)
|
Always
|
Below 1 Ω
|
I20-4 (EFIO) or A47-26 (IMI) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
for M20A-FKS (K121 CVT):
Tester Connection
|
Condition
|
Specified Condition
|
I20-4 (EFIO) - A178-54 (IMI)
|
Always
|
Below 1 Ω
|
I20-4 (EFIO) or A178-54 (IMI) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
for G16E-GTS:
Tester Connection
|
Condition
|
Specified Condition
|
I20-4 (EFIO) - A139-61 (IMI)
|
Always
|
Below 1 Ω
|
I20-4 (EFIO) or A139-61 (IMI) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
Post-procedure1
(d) None
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
Pre-procedure1
(a) Disconnect the A47*1, A178*2 or A139*3 ECM connector.
-
*1: for M20A-FKS (except K121 CVT)
-
*2: for M20A-FKS (K121 CVT)
-
*3: for G16E-GTS
Procedure1
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for M20A-FKS (except K121 CVT):
Tester Connection
|
Condition
|
Specified Condition
|
A47-25 (IMO) - Body ground
|
Ignition switch turned to 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 M20A-FKS (K121 CVT):
Tester Connection
|
Condition
|
Specified Condition
|
A178-55 (IMO) - Body ground
|
Ignition switch turned to ON using registered electrical key transmitter sub-assembly
|
Terminal IMO stuck low (2.4 V or less)
|
for G16E-GTS:
Tester Connection
|
Condition
|
Specified Condition
|
A139-47 (IMO) - Body ground
|
Ignition switch turned to 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
|
Proceed to
|
Terminal IMO stuck low (2.4 V or less)
|
A
|
Terminal IMO stuck high (12 V) or abnormal waveform
|
B
|
Post-procedure1
(c) None
B |
|
REPLACE ECM
for M20A-FKS: Click here
for G16E-GTS: Click here
|
A
|
|
|
8.
|
CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM)
|
Pre-procedure1
(a) Disconnect the I20 ID code box (immobiliser code ECU) connector.
Procedure1
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for M20A-FKS (except K121 CVT):
Tester Connection
|
Condition
|
Specified Condition
|
I20-3 (EFII) - A47-25 (IMO)
|
Always
|
Below 1 Ω
|
I20-3 (EFII) or A47-25 (IMO) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
I20-4 (EFIO) - A47-26 (IMI)
|
Always
|
Below 1 Ω
|
I20-4 (EFIO) or A47-26 (IMI) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
for M20A-FKS (K121 CVT):
Tester Connection
|
Condition
|
Specified Condition
|
I20-3 (EFII) - A178-55 (IMO)
|
Always
|
Below 1 Ω
|
I20-3 (EFII) or A178-55 (IMO) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
I20-4 (EFIO) - A178-54 (IMI)
|
Always
|
Below 1 Ω
|
I20-4 (EFIO) or A178-54 (IMI) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
for G16E-GTS:
Tester Connection
|
Condition
|
Specified Condition
|
I20-3 (EFII) - A139-47 (IMO)
|
Always
|
Below 1 Ω
|
I20-3 (EFII) or A139-47 (IMO) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
I20-4 (EFIO) - A139-61 (IMI)
|
Always
|
Below 1 Ω
|
I20-4 (EFIO) or A139-61 (IMI) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
Post-procedure1
(c) None
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
9.
|
CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM)
|
Pre-procedure1
(a) Disconnect the I20 ID code box (immobiliser code ECU) connector.
(b) Disconnect the A47*1, A178*2 or A139*3 ECM connector.
-
*1: for M20A-FKS (except K121 CVT)
-
*2: for M20A-FKS (K121 CVT)
-
*3: for G16E-GTS
Procedure1
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for M20A-FKS (except K121 CVT):
Tester Connection
|
Condition
|
Specified Condition
|
I20-3 (EFII) - A47-25 (IMO)
|
Always
|
Below 1 Ω
|
I20-3 (EFII) or A47-25 (IMO) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
for M20A-FKS (K121 CVT):
Tester Connection
|
Condition
|
Specified Condition
|
I20-3 (EFII) - A178-55 (IMO)
|
Always
|
Below 1 Ω
|
I20-3 (EFII) or A178-55 (IMO) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
for G16E-GTS:
Tester Connection
|
Condition
|
Specified Condition
|
I20-3 (EFII) - A139-47 (IMO)
|
Always
|
Below 1 Ω
|
I20-3 (EFII) or A139-47 (IMO) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
Post-procedure1
(d) None
OK |
|
REPLACE ECM
for M20A-FKS: Click here
for G16E-GTS: Click here
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|