Marea-Marea Weekend®
16v
Engine
1998 range
Fuel system
10.
Self-adaptability
The control unit features a self-adaptive function able to memorise deviations between basic maps and
corrections imposed by the lambda probe that occur persistently during operation. Such deviations (due
to system and engine component ageing) are saved permanently so that system operation can be adapt-
ed to gradual changes in engine and components with regard to original specifications. The corrections
are IMOT lost even when the batter or control unit is disconnected
The strategy is de-activated while the carbon filter flushing solenoid is open. If the ECU is replaced, it is
advisable to leave the engine to idle for a few minutes until warm to allow the ECU to store the correc-
tion again. Corrections at higher speeds are stored under normal driving conditions.
The control unit is also equipped with a self-adaptive function which corrects idle speed actuator open-
ing when idling on the basis of changes due to throttle body leaks or natural engine ageing. This specific
correction is lost by disconnecting the battery or control unit.
Starting and post-starting
During start-up, engine phase cannot be instantly identified and phased injection cannot therefore be
implemented for the first injection in each cylinder.
An initial simultaneous injection is carried out during the first few engine revolutions (full group) be-
cause the considerable fluctuations in rotation speed do not permit injection time to be calculated cor-
rectly. Only subsequently does injection becomes phased.
The base pulse constant is increased by a certain factor throughout the period when the engine is
cranked by the starter motor.
Once start-up has taken place, the factor is gradually reduced to zero within a given time period, which
is in inverse proportion to engine temperature.
ON
k : enrichment factor
OFF
t : time
a : decrease proportional to engine
temperature
ON: engine cranked
OFF: engine running
P4F05IJ01
Copyright Fiat Auto
5
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