DESCRIPTION
This DTC is stored when one of the following occurs: 1) the ECM detects errors in its own communications with the transponder key ECU assembly; 2) the ECM detects errors in the communication lines; or 3) the ECU communication ID between the transponder key ECU assembly and ECM is different and an engine start is attempted.
Before troubleshooting for this DTC, make sure that no transponder key ECU assembly DTCs are present. If present, troubleshoot the transponder key ECU assembly DTCs first.
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
B2799 |
One of the following conditions is met:
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page ).
(b) Recheck for DTCs (See page ).
OK:
DTC B2799 is not output.
OK | ![]() |
USE SIMULATION METHOD TO CHECK |
|
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 B2799 is not output.
OK | ![]() |
END (ECU COMMUNICATION ID WAS NOT REGISTERED CORRECTLY) |
|
4. |
CHECK CONNECTION OF CONNECTOR |
(a) Turn the ignition switch off.
(b) Check that the connectors are properly connected to the ECM and transponder key ECU assembly.
OK:
Connectors are properly connected.
NG | ![]() |
CONNECT CONNECTORS PROPERLY |
|
5. |
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM) |
(a) Disconnect the transponder key ECU assembly connector.
(b) Disconnect the ECM connector. |
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for 2GR-FE
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D22-12 (EFII) - A41-29 (IMO) |
Always |
Below 1 Ω |
D22-13 (EFIO) - A41-40 (IMI) |
Always |
Below 1 Ω |
D22-12 (EFII) - Body ground |
Always |
10 kΩ or higher |
D22-13 (EFIO) - Body ground |
Always |
10 kΩ or higher |
A41-29 (IMO) - Body ground |
Always |
10 kΩ or higher |
A41-40 (IMI) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D22-12 (EFII) - A49-10 (IMO) |
Always |
Below 1 Ω |
D22-13 (EFIO) - A49-11 (IMI) |
Always |
Below 1 Ω |
D22-12 (EFII) - Body ground |
Always |
10 kΩ or higher |
D22-13 (EFIO) - Body ground |
Always |
10 kΩ or higher |
A49-10 (IMO) - Body ground |
Always |
10 kΩ or higher |
A49-11 (IMI) - Body ground |
Always |
10 kΩ or higher |
*1 |
Front view of wire harness connector (to Transponder Key ECU Assembly) |
*2 |
Front view of wire harness connector (to ECM) |
*3 |
for 2GR-FE |
*4 |
for 1AR-FE |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
REPLACE ECM |
(a) Replace the ECM (See page for 2GR-FE,
for 1AR-FE).
|
7. |
REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID (See page
).
|
8. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page ).
(b) Recheck for DTCs (See page ).
OK:
DTC B2799 is not output.
OK | ![]() |
END (ECM WAS DEFECTIVE) |
NG | ![]() |
REPLACE TRANSPONDER KEY ECU ASSEMBLY |
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
Use the table below to help determine the cause of problem symptoms. If multiple
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COMPONENTS
ILLUSTRATION
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REMOVAL
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the LH side and RH side.
The following procedure is for the LH side.
PROCEDURE
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