DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CLEAR DTC
CHECK FOR DTC
CHECK CONNECTION OF CONNECTOR
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)
REPLACE TRANSPONDER KEY ECU ASSEMBLY
REGISTER KEY
REGISTER ECU COMMUNICATION ID
CHECK WHETHER ENGINE STARTS
DTC B279A Theft Deterrent System Communication Line High Fixation
DESCRIPTION
When the communication line (IMI - EFIO) between the ECM and transponder key ECU assembly is stuck on HI output, the ECM stores this DTC.
| DTC Code | DTC Detection Condition | Trouble Area | DTC Output Confirmation Operation |
| B279A | The communication line (IMI - EFIO) between the ECM and transponder key ECU assembly is stuck on HI output (1 trip detection logic*). | Harness or connector
Transponder key ECU assembly
ECM
| 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 start is prohibited |
Related Data List and Active Test| DTC Code | Data List and Active Test |
| B279A | - |
WIRING DIAGRAM
INSPECTION PROCEDURE
When replacing the transponder key ECU assembly, refer to the Service Bulletin.
When replacing the ECM, refer to Initialization ().
After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.
Check for DTCs ().
- Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
- OK:
- DTC B279A is not output.
| OK | |
| |
| USE SIMULATION METHOD TO CHECK ()
|
|
| 3.CHECK CONNECTION OF CONNECTOR |
Check that the connectors are properly connected to the ECM and transponder key amplifier assembly.
- OK:
- Connectors are properly connected.
| | CONNECT CONNECTORS PROPERLY |
|
|
| 4.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM) |
Disconnect the E96 transponder key ECU assembly connector.
Disconnect the A38*1 or A52*2 ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for LHD| Tester Connection | Condition | Specified Condition |
| E96-13 (EFIO) - A38-11 (IMI) | Always | Below 1 Ω |
| E96-13 (EFIO) - Body ground | Always | 10 kΩ or higher |
for RHD| Tester Connection | Condition | Specified Condition |
| E96-13 (EFIO) - A52-11 (IMI) | Always | Below 1 Ω |
| E96-13 (EFIO) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 5.REPLACE TRANSPONDER KEY ECU ASSEMBLY |
Replace the transponder key ECU assembly.
Register the key (refer to the Service Bulletin).
| 7.REGISTER ECU COMMUNICATION ID |
Register the ECU communication ID (refer to the Service Bulletin).
| 8.CHECK WHETHER ENGINE STARTS |
Check that the engine starts with the key.
- OK:
- Engine starts normally.
Result| Result | Proceed to |
| OK | A |
| NG (for 1GR-FE) | B |
| NG (for 1VD-FTV) | C |
| A | |
| |
| END (TRANSPONDER KEY ECU WAS DEFECTIVE) |
|