DESCRIPTION
When the communication line (EFIO-IMI) between the transponder key ECU assembly
and ECM is stuck on HI output, the ECM stores this DTC.
|
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
Note
|
|
B279A
|
Theft Deterrent System Communication Line High Fixation
|
The communication line (EFIO-IMI) between the ECM and transponder key
ECU assembly is stuck on HI output (1 trip detection logic*).
|
- Harness or connector
- ECM
- Transponder key ECU assembly
|
- Turn the ignition switch to ON and wait 6 seconds.
|
- *: Only output while a malfunction is present.
Vehicle Condition and Fail-safe Operation when Malfunction Detected
|
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
|
Related Data List and Active Test
|
DTC No.
|
Data List and Active Test
|
|
B279A
|
-
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- If the transponder key ECU assembly or ECM is replaced, refer to Registration.
Click here 
- After repair, confirm that no DTCs are output by performing "DTC Output
Confirmation Operation".
PROCEDURE
|
1.
|
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
|
| OK |
|
|
|
2.
|
CHECK ECM (IMI TERMINAL VOLTAGE)
|
(a) Disconnect the transponder key ECU assembly connector.
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection
|
Condition
|
Specified Condition
|
|
J26-13 (EFIO) - Body ground
|
Always
|
11 to 14 V
|
|
|
|
*a
|
Front view of wire harness connector
(to Transponder Key ECU Assembly)
|
|
|
(c) Connect the transponder key ECU assembly connector.
| NG |
|
GO TO STEP 4
|
| OK |
|
|
|
|
3.
|
CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)
|
(a) Using an oscilloscope, check the waveform.
|
*a
|
Component with harness connected
(Transponder Key ECU Assembly)
|
*b
|
Waveform
|
Measurement Condition:
|
Item
|
Content
|
|
Tester Connection
|
J26-13 (EFIO) - Body ground
|
|
Tool Setting
|
2 V/DIV., 500 ms./DIV.
|
|
Condition
|
Within 3 seconds of starter operation and initial combustion, or within
3 seconds of ignition switch first being turned to ON after cable disconnected
and reconnected to negative (-) battery terminal
|
OK:
Waveform is similar to that shown in the illustration.
| OK (for 1UR-FE) |
|
REPLACE ECM
|
| OK (for 3UR-FE) |
|
REPLACE ECM
|
| OK (for 3UR-FBE) |
|
REPLACE ECM
|
| NG |
|
REPLACE TRANSPONDER KEY ECU ASSEMBLY (TRANSPONDER KEY ECU ASSEMBLY WAS
DEFECTIVE)
|
|
4.
|
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM AND BODY
GROUND)
|
(a) Disconnect the A24 ECM connector.
(b) Disconnect the J26 transponder key ECU assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for 1UR-FE
|
Tester Connection
|
Condition
|
Specified Condition
|
|
J26-13 (EFIO) - A24-40 (IMI)
|
Always
|
Below 1 Ω
|
|
A24-40 (IMI) - Body ground
|
Always
|
10 kΩ or higher
|
|
J26-13 (EFIO) - Body ground
|
Always
|
10 kΩ or higher
|
for 3UR-FE, 3UR-FBE
|
Tester Connection
|
Condition
|
Specified Condition
|
|
J26-13 (EFIO) - A24-46 (IMI)
|
Always
|
Below 1 Ω
|
|
A24-46 (IMI) - Body ground
|
Always
|
10 kΩ or higher
|
|
J26-13 (EFIO) - Body ground
|
Always
|
10 kΩ or higher
|
| OK (for 1UR-FE) |
|
REPLACE ECM
|
| OK (for 3UR-FE) |
|
REPLACE ECM
|
| OK (for 3UR-FBE) |
|
REPLACE ECM
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
| 
