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*). |
| Turn the ignition switch to ON and wait 6 seconds. |
- *: Only output while a malfunction is present.
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 |
B279A | - |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- When replacing the transponder key ECU assembly, refer to the Registration (Click here).
- When replacing the ECM, refer to the INITIALIZATION (Click here).
- After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.
1.CLEAR DTC |
Clear the DTCs (Click here).
NEXT | |
2.CHECK FOR DTC |
Check for DTCs (Click here).
- HINT:
- Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
- OK:
- DTC B279A is not output.
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OK | ||
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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.
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OK | |
4.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM) |
Disconnect the D139 transponder key ECU assembly connector.
Disconnect the A72 ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition D139-13 (EFIO) - A72-28 (IMI) Always Below 1 Ω D139-13 (EFIO) - Body ground Always 10 kΩ or higher
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OK | |
5.REPLACE TRANSPONDER KEY ECU ASSEMBLY |
Replace the transponder key ECU assembly with a new one (Click here).
NEXT | |
6.REGISTER KEY |
Register the key (Click here).
NEXT | |
7.REGISTER ECU COMMUNICATION ID |
Register the ECU communication ID (Click here).
NEXT | |
8.CHECK WHETHER ENGINE STARTS |
Check that the engine starts with the key.
- OK:
- Engine starts normally.
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OK | ||
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