- Error in communication between ECM and certification ECU
- Error in communication lines
- Communication ID is different between certification ECU and ECM during communication
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000ZL6N |
| Model Year Start: 2017 | Model: Sienna | Prod Date Range: [08/2016 - ] |
| Title: THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM(w/ Smart Key System): B279986; Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid; 2017 - 2020 MY Sienna [08/2016 - ] | ||
|
DTC |
B279986 |
Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid |
DESCRIPTION
This DTC is stored when one of the following occurs: 1) the ECM detects an error in its own communication with the certification ECU; 2) the ECM detects an error in the communication lines; or 3) the ECU communication ID between the certification ECU and ECM is different when an engine start is attempted.
HINT:
Before troubleshooting this DTC, make sure that no certification ECU DTCs are present. If present, troubleshoot the certification ECU DTCs first.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B279986 |
One of the following conditions is met: |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
If the certification ECU is replaced, register the key (See page
![2017 - 2020 MY Sienna [08/2016 - ]; THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM(w/ Smart Key System): REGISTRATION](/t3Portal/stylegraphics/info.gif)
).
PROCEDURE
|
1. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page
).
(b) Recheck for DTCs (See page
).
OK:
DTC B279986 is not output.
| OK |
|
USE SIMULATION METHOD TO CHECK (See page
|
|
|
2. |
RE-REGISTER ECU COMMUNICATION ID |
(a) Re-register the ECU communication ID (See page
).
|
|
3. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page
).
(b) Recheck for DTCs (See page
).
OK:
DTC B279986 is not output.
| OK |
|
END (ECU COMMUNICATION ID WAS INCORRECT) |
|
|
4. |
CHECK CONNECTOR CONNECTION CONDITION |
(a) Turn the engine switch off.
(b) Check that the connectors are properly connected to the ECM and certification ECU.
OK:
Connectors are properly connected.
| NG |
|
CONNECT CONNECTORS PROPERLY |
|
|
5. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ECM) |
(a) Disconnect the certification ECU connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D88-34 (EFII) - A69-45 (IMO) |
Always |
Below 1 Ω |
|
D88-35 (EFIO) - A69-59 (IMI) |
Always |
Below 1 Ω |
|
D88-34 (EFII) - Body ground |
Always |
10 kΩ or higher |
|
D88-35 (EFIO) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
6. |
REPLACE ECM |
(a) Replace the ECM (See page
).
|
|
7. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page
).
(b) Recheck for DTCs (See page
).
OK:
DTC B279986 is not output.
| OK |
|
END (ECM WAS DEFECTIVE) |
| NG |
|
REPLACE SMART KEY ECU ASSEMBLY (See page
|
|
|