Immobilizer System: Operation
- When the ignition switch is turned to "ON" position, the PCM sends a requirement for the encrypted code to the immobilizer-ECU (at this time, the engine is remobilized).
- When the immobilizer-ECU receives the requirement from the PCM, the immobilizer-ECU supplies power to the transponder inside the ignition key via the antenna. The energized transponder sends the encrypted code back to the immobilizer-ECU via the antenna.
- The immobilizer-ECU judges the encrypted code with its code logic in itself. If they are identical, the immobilizer-ECU sends the encrypted code to the PCM.
- If the PCM can not receive the encrypted code, the engine will be immobilized.
CAUTION:
To replace immobilizer system related parts, refer to the Fig 2. When the ignition key is re-registered with scan tool MB991958, the originally registered ignition key registration information will be lost.