Electrical system
Bravo-Brava
Fiat COPE
55.
When the ignition is switched ON (+15), the engine control unit requests a code from the Fiat CODE
control unit; after receiving the code, it compares it with the Master Code stored in memory. If the com-
parison of the code gives a positive result, the engine control unit permits starting and normal operation
of the engine.
If the Fiat CODE control unit is faulty, the engine control unit manages the emergency starting proce-
dure activated by the Fiat Lancia Tester or (for petrol versions with integrated fuel injection/ignition sys-
tems and diesel versions with electronic fuel injection) by means of the accelerator pedal.
Under no circumstances may engine control units be exchanged between cars to check
whether they are working.
During diagnosis, before replacing the engine control
unit,
make sure that the component un-
der examination really is
faulty,
because when the new engine control unit is supplied, the
Master Code will be memorized, rendering it entirely unusable on other cars.
Fiat CODE control unit
The main function of the Fiat CODE is to recognize the keys inserted in the ignition switch.
At the request of the engine control unit, the Fiat CODE unit sends to the former:
- the Master Code (key recognized), enabling starting and normal operation of the engine;
- the diagnosis code (key not recognized) preventing engine starting.
The Fiat CODE control unit also has to do the following:
- manage the memorization or rememorization of the keys;
- memorize the Master Code in the engine control unit (at the request of the engine control unit);
- manage the CODE warning light.
There are two procedures for dialogue between the Fiat CODE control unit and the engine control unit:
a. after the Fiat CODE control unit has memorized the keys, dialogue with the UNUSED engine control
unit begins. The exchange of information (registration of the code) between the engine control unit
and the Fiat CODE control unit is guided only by the engine control unit; the Fiat CODE control unit
is only enabled to respond to interrogations from the engine control unit;
b. checking the code is a standard procedure which is repeated whenever the user inserts the electronic
key in the ignition switch block and turns it to the ON
( +
15) position; the checking procedure also
continues when the user moves the key to the START (+50) position.
With the key at the ON
(
+ 15) position, the Fiat CODE control unit must recognize the electronic key
with its relevant code. There will be two possibilities:
- recognition of the code by the Fiat CODE control unit; the engine code control unit enables starting
and engine operation (the CODE warning light goes out);
- if the code recognition is negative, the Fiat CODE control unit will send a code to the engine control
unit which will not permit engine starting (CODE warning light is on permanently).
60
Publication no. 506.670/01
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