DESCRIPTION
If the communication line (EFIO-IMI) to the transponder key ECU assembly is stuck high (e.g. shorted to +B), the ECM stores this DTC.
DTC No. |
DTC Detection Condition |
Trouble Area |
DTC Output Confirmation Operation |
---|---|---|---|
B279A*1 |
Communication line (EFIO-IMI) between the ECM and transponder key ECU assembly is stuck high. |
|
Turn the ignition switch to ON and wait 6 seconds. |
B279A12*2 |
Communication line (EFIO-IMI) between the ECM and transponder key ECU assembly is stuck high. |
|
Turn the ignition switch to ON 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 No. |
Data List and Active Test |
---|---|
B279A*1 |
- |
B279A12*1 |
- |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
2. |
CHECK DTC OUTPUT |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs (See page ).
Result |
Proceed to |
---|---|
DTC B279A (for 2TR-FE) or B279A12 (for 2GR-FKS) is output |
A |
DTC B279A (for 2TR-FE) or B279A12 (for 2GR-FKS) is not output |
B |
B | ![]() |
USE SIMULATION METHOD TO CHECK |
|
3. |
CHECK CONNECTION OF CONNECTOR |
(a) Check that the connectors are properly connected to the ECM and transponder key ECU assembly.
OK:
Connectors are properly connected.
NG | ![]() |
CONNECT CONNECTORS PROPERLY |
|
4. |
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM) |
(a) Disconnect the T10 transponder key ECU assembly connector.
(b) Disconnect the E14*1 or E20*2 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
T10-13 (EFIO) - E14-8 (IMI)*1 |
Always |
Below 1 Ω |
T10-13 (EFIO) or E14-8 (IMI) - Body ground*1 |
Always |
10 kΩ or higher |
T10-13 (EFIO) - E20-10 (IMI)*2 |
Always |
Below 1 Ω |
T10-13 (EFIO) or E20-10 (IMI) - Body ground*2 |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
REPLACE TRANSPONDER KEY ECU ASSEMBLY |
(a) Replace the transponder key ECU assembly with a new one (See page
).
|
6. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
7. |
CHECK FOR DTC |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs (See page ).
Result |
Proceed to |
---|---|
DTC B279A (for 2TR-FE) or B279A12 (for 2GR-FKS) is not output |
A |
DTC B279A is output (for 2TR-FE) |
B |
DTC B279A12 is output (for 2GR-FKS) |
C |
A | ![]() |
END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE) |
B | ![]() |
REPLACE ECM |
C | ![]() |
REPLACE ECM |
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT SHIFT LEVER POSITION
(a) When moving the shift lever from P to each position with the ignition switch
ON and the brake pedal depressed, check that the shift lever moves smoothly and
correctly into position.
(b) Start the engine and check that the ve ...
Removal
REMOVAL
CAUTION / NOTICE / HINT
NOTICE:
Before starting the work, make sure that the ignition switch is off
and depress the brake pedal more than 20 times.
As high pressure is applied to the No. 1 brake actuator tube, never
deform it.
Do not turn the ignition switch to ON ...
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. CHECK FUEL PUMP OPERATION AND INSPECT FOR FUEL LEAK
(a) Connect the Techstream to the DLC3.
(1) Turn the ignition switch to ON.
NOTICE:
Do not start the engine.
(2) Turn the Techstream on.
(3) Enter the following menus: Powertrain / Engine / Active Test / C ...