Dacia Solenza 2004, Repair Manual

Page: 107 / 891

IGNITION AND INJECTION
17
17 - 13
PRINCIPLE
In engine normal operation conditions at warm, the RCO value is varying between a high and
a low limit, in order to obtain the nominal idling regime. Further to an operation dispersion
(running in, engine clogging, etc), it may be possible that RCO idling value to be situated next to
the lower and higher values.
The adaptive correction of the “
RCO
idling
”
parameter is allowing obtaining of slow variations
of the engine air requirement, so that RCO value centering on an average nominal vale is obtained.
This correction is becoming effective unless the water temperature is over 80°C, at 20 seconds
after engine starting and if it is in the nominal idling adjustment phase.
“RCO IDLING” AND “ IDLING ENRICHING ADAPTATION” VALUES
PARA METER RECOMMENDED VALUE
PR006: Engine regime 750 rot/min
PR022: RCO idling 5%< X < 12%
PR031: Idling enriching adaptation 80 < X < 176
At each engine stopping, the injection computer is controlling the performing of a new position-
ing of the step-by-step engine, bringing it to the bottom limit. This function so called “re-setting”, is
maintained for 8 seconds.
INTERPRETATION OF THE PREVIOUSLY MENTIONED PARAMETERS
In the situation of an air excess (infiltration air, valve body inadequate attachment, etc), the idling
regime will increase and the
“RCO
idling
”
value will decrease in order to return to the nominal
idling regime. The value of the
RCO
idling adaptive correction will decrease in order to centering
again the idling adjustment operation.
In case of an air lack (clogging, etc) the reasoning is opposite: “ RCO idling” is increasing, and
the value of the “
RCO
idling” adaptive correction will increase in order to center again the idling
operation on an average nominal value.
IMPORTANT
: After erasing the failures memorized by the injection computer, it is necessary
to start the engine then stop it, in order to achieve in this way the re-setting of the step-by-step
engine. Start then again the engine and let it idle run until reaching the nominal idling regime, in
order to achieve a correct re-setting of the adaptive correction.
Idling regime adaptive correction
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