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 |
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms.
If multiple suspected areas are listed, the potential causes of the symptoms
are listed in order of probability in the "Suspected Area" column of the
table. Check each sy ...
Cellular Phone Registration Failure, Phone Directory Transfer Failure
PROCEDURE
1.
CHECK OPERATION
(a) Place the cellular phone close to the navigation receiver assembly.
(b) Check if the cellular phone can be registered.
OK:
The cellular phone can be registered.
OK
NORMAL OPERATION
...
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT REFRIGERANT PRESSURE
(a) This method uses a refrigerant recovery unit set to locate problem areas.
Read the refrigerant pressure when the test conditions are established.
Test conditions:
Temperature at the air inlet with the air recirculation ...