Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001GV8E |
Model Year Start: 2020 |
Model: GR Corolla |
Prod Date Range: [01/2019 - 11/2022] |
Title: THEFT DETERRENT / KEYLESS ENTRY: IMMOBILISER SYSTEM (w/o Smart Key System): B279986,B2799; Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid; 2020 - 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 11/2022] |
DTC
|
B279986
|
Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid
|
DTC
|
B2799
|
Engine Immobiliser System Malfunction
|
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
|
B2799
|
Engine Immobiliser System Malfunction
|
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 (-) battery terminal, turn the ignition switch to ON and wait 10 seconds.
|
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 (-) 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
|
B2799*1
|
-
|
B279986*2
|
-
|
-
*1: for 2ZR-FAE
-
*2: for M20A-FKS
WIRING DIAGRAM
CAUTION / NOTICE / HINT
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.
NEXT
|
|
|
2.
|
INSPECT TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFII)
|
(a) Using an oscilloscope, check the waveform.
*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 (-) 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
|
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)
|
(a) Using an oscilloscope, check the waveform.
*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 (-) battery terminal
|
2 V/DIV., 500 ms./DIV.
|
Pulse generation
(See waveform)
|
OK:
Waveform is similar to that shown in the illustration.
OK
|
|
|
4.
|
REGISTER ECU COMMUNICATION ID
|
(a) Reregister the ECU communication ID.
NEXT
|
|
|
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.
OK |
|
END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)
|
6.
|
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)
|
(a) Disconnect the I67 transponder key ECU assembly connector.
(b) Disconnect the A46*1 or A47*2 ECM connector.
-
*1: for 2ZR-FAE
-
*2: for M20A-FKS
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for 2ZR-FAE
Tester Connection
|
Condition
|
Specified Condition
|
I67-11 (EFIO) - A46-28 (IMI)
|
Always
|
Below 1 Ω
|
I67-11 (EFIO) or A46-28 (IMI) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
for M20A-FKS
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
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
7.
|
INSPECT ECM (IMO TERMINAL VOLTAGE)
|
(a) Disconnect the A46*1 or A47*2 ECM connector.
-
*1: for 2ZR-FAE
-
*2: for M20A-FKS
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for 2ZR-FAE
Tester Connection
|
Condition
|
Result
|
A46-45 (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
|
for M20A-FKS
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
|
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)
|
(a) Disconnect the I67 transponder key ECU assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for 2ZR-FAE
Tester Connection
|
Condition
|
Specified Condition
|
I67-10 (EFII) - A46-45 (IMO)
|
Always
|
Below 1 Ω
|
I67-10 (EFII) or A46-45 (IMO) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
for M20A-FKS
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
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
9.
|
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)
|
(a) Disconnect the I67 transponder key ECU assembly connector.
(b) Disconnect the A46*1 or A47*2 ECM connector.
-
*1: for 2ZR-FAE
-
*2: for M20A-FKS
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for 2ZR-FAE
Tester Connection
|
Condition
|
Specified Condition
|
I67-10 (EFII) - A46-45 (IMO)
|
Always
|
Below 1 Ω
|
I67-10 (EFII) or A46-45 (IMO) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
for M20A-FKS
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
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|