Fiat Bravo Service Manual page 357

Engine Bravo isp^
Fuel system
10.
This self-adjustment function also makes it possible to compensate for the inevitable differences (due to
production tolerances) of any components which may have been replaced. This allows the best possi­
ble results for all vehicles with special adjustment or checking operations.
The self-adjustment parameters are lost if the control unit is disconnected.
Connection with engine starting immobilizing device (Fiat CODE)
To increase protection against theft attempts, the vehicle has been equipped with an engine immobiliz­
ing device (Fiat CODE) which only allows the activation of the injection/ignition control unit by means
of an electronic code.
Each time the key is turned to the OFF position, the Fiat CODE system completely deactivates the injec­
tion/ignition control unit.
When the ignition key is turned from the OFF position to the ON position the following operations take
place in the order given:
1. The injection/ignition control unit sends the Fiat CODE control unit a request for the secret code in
order to deactivate the functions lock.
2. The Fiat CODE control unit responds by sending the secret code only after it, in turn, has received the
recognition code transmitted by the ignition key, which contains a special transponder inside.
3. The recognition of the secret code allows the de-activation of the functions lock and the injection/ig­
nition control unit can activate the normal system management programme.
A special two directional serial line allows the exchange of information between the injection/ignition
control unit and the Fiat CODE control unit.
If there is a failure in the Fiat CODE system it is, however, still possible to start the engine via an emer­
gency procedure.
Control units must not, under any circumstances, be exchanged between different vehicles to
check if they are working properly.
During the fault diagnosis, before replacing the control unit, make sure that it really is not work­
ing properly, because when a new control unit is supplied the secret code is memorized making
it completely unusable on other vehicles.
Autodiagnosis
The Motronic M 2.10.4 injection/ignition system is also equipped with an "autodiagnosis" function
which memorizes any problems with the sensors and actuators, making it easier to detect and correct
them. Any problem is signalled by the appropriate warning light in the instrument panel.
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