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Ignition Switch: General Description: Operation

  1. When the ignition switch is turned to "ON" position, the ECM < M/T > or PCM < A/T > 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 ECM < M/T > or PCM < A/T >, 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 ECM < M/T > or PCM < A/T >.
  4. If the ECM < M/T > or PCM < A/T > can not receive the encrypted code, the engine will be immobilized.
    Fig 1: Immobilizer System Diagram
    G02498076Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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