| Last Modified: 11-20-2023 | 6.11:8.1.0 | Doc ID: RM1000000012VQ1 |
| Model Year Start: 2018 | Model: Camry | Prod Date Range: [03/2017 - ] |
| Title: THEFT DETERRENT / KEYLESS ENTRY: IMMOBILISER SYSTEM (w/o Smart Key System): B279986; Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid; 2018 - 2024 MY Camry [03/2017 - ] | ||
|
DTC |
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:
|
|
DTC Output Confirmation Operation:
|
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
CAUTION / NOTICE / HINT
NOTICE:
-
If the transponder key ECU assembly or ECM is replaced, refer to Registration.
Click here
![2018 - 2019 MY Camry [03/2017 - 09/2019]; THEFT DETERRENT / KEYLESS ENTRY: IMMOBILISER SYSTEM (w/o Smart Key System): REGISTRATION](/t3Portal/stylegraphics/info.gif)
- 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.
Click here
|
|
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 |
|---|---|---|---|
|
K60-10 (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 |
| B |
|
| C |
|
REPLACE ECM
|
|
|
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 |
|---|---|---|---|
|
K60-11 (EFIO) - Body ground |
Ignition switch ON |
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform) |
OK:
Waveform is similar to that shown in the illustration.
| NG |
|
REPLACE TRANSPONDER KEY ECU ASSEMBLY
|
|
|
4. |
REGISTER ECU COMMUNICATION ID |
(a) Reregister the ECU communication ID.
Click here
|
|
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) |
| NG |
|
REPLACE ECM
|
|
6. |
INSPECT ECM (IMO TERMINAL VOLTAGE) |
(a) Disconnect the A24 ECM connector.
(b) Turn the ignition switch to ON.
|
(c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
|
Result |
Proceed to |
|---|---|
|
Terminal IMO stuck low (2.4 V or less) |
A |
|
Terminal IMO stuck high (12 V) or abnormal waveform |
B |
| B |
|
REPLACE ECM
|
|
|
7. |
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM) |
(a) Disconnect the K60 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 |
|---|---|---|
|
K60-10 (EFII) - A24-25 (IMO) |
Always |
Below 1 Ω |
|
K60-10 (EFII) or A24-25 (IMO) - Other terminals and body ground |
Always |
10 kΩ or higher |
| OK |
|
REPLACE TRANSPONDER KEY ECU ASSEMBLY
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|