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Immobilizer System: Operation

WARNING: This page is about a different car, the 2004 Mitsubishi Galant. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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).
  2. 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.
  3. 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.
  4. If the PCM can not receive the encrypted code, the engine will be immobilized.
Fig 1: Identifying Operation Of Immobilizer System
G00870818Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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.
Fig 2: Identifying Immobilizer System Related Parts
G00870819Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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