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 |
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
The ECM of this system is connected to the CAN communication system.
Therefore, before starting troubleshooting, make sure to check that there
is no trouble in the CAN and multiplex communication system.
*: Use the Techstream.
PROCEDURE
...
Rear Differential Lock Solenoid Circuit High (P17C1)
DESCRIPTION
This DTC is output when a malfunction is detected due to a battery short occurring
in the differential lock coil drive circuit of the rear differential.
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
P17C1
...
Motor Malfunction (C1427)
DESCRIPTION
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
C1427
Motor Malfunction
Actuator pump motor does not operate properly.
Brake actuator assembly (Ground circuit)
Brak ...