DESCRIPTION
If the communication line (EFIO-IMI) to the transponder key ECU assembly is stuck high output (e.g. shorted to +B), the ECM stores this DTC.
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
B279A |
Communication line (EFIO-IMI) between the ECM and transponder key ECU assembly is stuck high output. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK DTC OUTPUT |
(a) Recheck for DTCs (See page ).
HINT:
If any DTCs other than DTC B279A are output, troubleshoot those DTCs first.
Result |
Proceed to |
---|---|
DTC B279A is output |
A |
DTC B279A and other DTCs are output |
B |
B | ![]() |
GO TO DTC CHART |
|
2. |
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 and voltage according to the value(s) in the table below.
Standard Resistance:
for 2GR-FE
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D22-13 (EFIO) - A41-40 (IMI) |
Always |
Below 1 Ω |
D22-13 (EFIO) - Body ground |
Always |
10 kΩ or higher |
A41-40 (IMI) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D22-13 (EFIO) - A49-11 (IMI) |
Always |
Below 1 Ω |
D22-13 (EFIO) - Body ground |
Always |
10 kΩ or higher |
A49-11 (IMI) - Body ground |
Always |
10 kΩ or higher |
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D22-13 (EFIO) - Body ground |
Always |
Below 1 V |
*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 |
|
3. |
CHECK TRANSPONDER KEY ECU ASSEMBLY (OUTPUT) |
(a) Reconnect the transponder key ECU assembly connector.
(b) Reconnect the ECM connector.
(c) Using an oscilloscope, check the waveform. Waveform 1 (Reference):
Result:
|
|
B | ![]() |
REPLACE ECM |
C | ![]() |
REPLACE ECM |
|
4. |
REPLACE TRANSPONDER KEY ECU ASSEMBLY |
(a) Replace the transponder key ECU assembly (See page
).
|
5. |
REGISTER KEY |
(a) Register the key (See page ).
|
6. |
REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID (See page
).
|
7. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page ).
(b) Recheck for DTCs (See page ).
OK:
DTC B279A is not output.
Result |
Proceed to |
---|---|
OK |
A |
NG (for 2GR-FE) |
B |
NG (for 1AR-FE) |
C |
A | ![]() |
END (TRANSPONDER KEY ECU WAS DEFECTIVE) |
B | ![]() |
REPLACE ECM |
C | ![]() |
REPLACE ECM |
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