Dacia Solenza 2004, Repair Manual

Page: 110 / 891

IGNITION AND INJECTION
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PRINCIPLE
When the engine is in “closed loop” phase, the enriching adjustment is correcting the injection
time in order to be able to obtain a fuel mixture with the enriching as close as possible to 1. The
correction value is fluctuating around the value 128, within the limits 0 and 255.
Although, variations in time of the components elements parameter of the injection system may
occur, this leading to the enriching correction displacement towards 0 or 255, in order to maintain
the enrichment at the value 1.
The adaptive correction is allowing the “resetting” of the injection chart in order to bring the
enrichment adjustment to the average value 128 and the achievement of an effective constant
correction for the enrichment or impoverishment of the fuel mixture.
The adaptive correction of the enrichment adjustment is divided into two components:
- preponderant adaptive correction at engine medium or high charges (adaptive enriching
during running);
- preponderant adaptive correction at engine idling or small charges (adaptive enriching
during idling).
The adaptive corrections are considering the value 128 as an average value after performing
the activation (after erasing the memorized failures) and they have for the next parameters, the
following limit values:
PR030 = Adaptive enriching during running 80< X < 176
PR031 = Adaptive correction during idling 80 < X < 176.
The adaptive corrections are not applied unless the engine is warm (water temperature > 80°C),
and it is in the “closed loop” phase and the pressure from the inlet manifold is in a certain interval.
It is necessary that engine has been run in “closed loop” phase in many of the inlet manifold
pressure areas, for which the adaptive correction evolution is starting the compensation of the
engine running enriching dispersions.
Therefore, further to UCE injection re-activation, after erasing the memorized failures, when
the values PR030 and PR031 are 128, it will be necessary that a specific road test is to be per-
formed.
Enriching adaptive correction
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