DESCRIPTION
When the communication line (IMI - EFIO) between the ECM and certification ECU (smart key ECU assembly) is stuck high, the ECM stores this DTC.
DTC Code |
DTC Detection Condition |
Trouble Area |
DTC Output Confirmation Operation |
---|---|---|---|
B279A12 |
The communication line (IMI - EFIO) between the ECM and certification ECU (smart key ECU assembly) is stuck high (1 trip detection logic*1). |
|
Turn the engine switch on (IG) and wait 6 seconds. |
Vehicle Condition when Malfunction Detected |
Fail-safe Operation when Malfunction Detected |
---|---|
Engine cannot be started (initial ignition occurs and engine cranks, then ignition stops) |
Engine cannot be started |
DTC Code |
Data List and Active Test |
---|---|
B279A12 |
- |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
HINT:
When DTC B279A12 and the certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) DTC.
PROCEDURE
1. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
2. |
CHECK FOR DTC |
(a) Turn the engine switch on (IG) and wait 10 seconds.
(b) Check for DTCs (See page ).
Result |
Proceed to |
---|---|
DTC or B279A12 is output |
A |
DTC or B279A12 and other DTCs are output |
B |
HINT:
If DTCs other than DTC B279A12 are output, troubleshoot those DTCs first.
B | ![]() |
GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
3. |
CHECK CONNECTION OF CONNECTOR |
(a) Turn the engine switch off.
(b) Check that the connectors are properly connected to the ECM and certification ECU (smart key ECU assembly).
OK:
Connectors are properly connected.
NG | ![]() |
CONNECT CONNECTORS PROPERLY |
|
4. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM) |
(a) Disconnect the C27 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the E14 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
C27-6 (EFIO) - E14-8 (IMI) |
Always |
Below 1 Ω |
C27-6 (EFIO) or E14-8 (IMI) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Replace the certification ECU (smart key ECU assembly) with a new one (See
page ).
|
6. |
REGISTER RECOGNITION CODES |
(a) Register the key (See page ).
|
7. |
REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID (See page
).
|
8. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
9. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
HINT:
Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
OK:
DTC B279A12 is not output.
OK | ![]() |
END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE) |
NG | ![]() |
REPLACE ECM |
Inside Vehicle
General Maintenance
GENERAL MAINTENANCE
CAUTION / NOTICE / HINT
Performing these maintenance checks on the vehicle is the owner's responsibility.
The owner may perform the maintenance or take the vehicle to a service center.
Check the parts of the vehicle described below on a daily basis ...
Removal
REMOVAL
CAUTION / NOTICE / HINT
NOTICE:
When replacing the forward recognition camera, replace it with a new
one.
Do not touch the camera lens or the front windshield glass in front
of the camera.
If the forward recognition camera has been struck or dropped, replace
it ...
Steering Angle Sensor Output Malfunction (C1434)
DESCRIPTION
Steering angle sensor signals are input to the skid control ECU (brake actuator
assembly) via the CAN communication system.
HINT:
When a malfunction occurs in the communication line to the steering angle sensor,
U0126 is output. If a DTC related to the CAN communication line is ou ...