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Engine Immobilizer

An engine immobiliser is an electronic device that acts to isolate the ignition system, the fuel system, the starter engine, or a combination of these three systems. As most new vehicles control these systems via the engine management system, immobilisers on newer vehicles tend to interface with this component. The immobiliser will not allow the vehicle to be started without first receiving the correct signal from the person starting the vehicle. This signal can be communicated to the immobiliser unit in a number of ways:

  • Transponder: an electronic proximity device that converts electronically coded signals into radio signals. Requires no action by owner to set or unset. Usually built in to original keys.
  • Remote Key: usually a hand-held device which, when activated, transmits a radio or infrared frequency to control the immobiliser.
  • Electronic Key: a coded key, which enables the engine to start.
  • Coded Keypad: requires a code or PIN to be entered to disable the immobiliser.
  • Key Switch: A switching method to disable the immobiliser.
  • Insurance: Insurance company helps self-arming immobilizer, an insurance approved unit will intercept at least two circuits like( the fuel pump circuit and the low-voltage ignition circuit).
  • Microcircuit: The microcircuit inside the key is activated by a small electromagnetic source which induces current to connect inside the key body, which in turn broadcasts a unique binary code to activate ECU.

 

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