RT-3 USER GUIDE____________________________________________________
4.2.3 CHECK UP
There is a dialog through an interconnection channel between the injection ECU and the
immobilizer ECU, to allow or not the vehicle’s ignition. This protection is implemented at
two levels; so, there are two conditions to be fulfilled for the authorisation to take place:
1.
The
immobilizer´s
ECU
is
programmed to allow the starting
only with the previously right coded
injection ECU.
2.
The immobilizer authorizes to start
only if the key’s code has already
been stored by the system ECU. That
means that in case the customer
needed a new key, this should be
recognised and memorized by the
immobilizer.
4.2.4 OPERATION
The steps done by the ECU before authorizing the ignition are the following:
The user enters the key and turns it on. Each key has a chip that emits a code when excited
by a radio-frequency signal. That signal is emitted from the ignition lock cylinder when
the contact has been done, then, a sensor reads the key’s emitted code.
The immobilizer ECU compares the read code with the stored codes(with a maximum of
five).If the read code matches with one of the stored codes, the immobilizer ECU
authorizes the starting.
Moreover when the engine just starts, the immobilizer´s ECU proceeds with the
recognition of the injection ECU allowing starting if the code is correct.
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