2004 DACIA SUPERNOVA Repair Manual

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 7
IN
JECTION-DISRUPTION LIGHT INDICATOR
THE SYSTEM PARTICULARITIES ( ANTI-STARTING INDICATOR )
On setting the contact, the injection calculator receives from UCE DECODING DE-
VI CE a c ode, which is then compared with t he one previously memorized; i f the two
codes are the same, then the start ing of the engine is authorized. After t he setting of t he c ontact, t he anti-start light indicator, which until then was fl ash-
ing on and off, will turn on for 3 seconds, and then it will turn off, thus confirming the
recognition of the key. If the key is wrong, after it has been put in the contact the light will turn on and off
quicker, and the engine starting will be impossible.
Ob servation:
Fo r details regarding the vehicle anti-start ing system, see chapter « Anti-starting
System » from the Workshop manual SupeRNova – vol.2, ed.I) PLACING OF ELEMENTS
vnx.su

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 8
THE ANTI-START FUNCTION
R
EPLACING UCE INJE CT IO N CAL CUL ATOR
The UCE injection
calculator is delivered without a code, but it is able to memorize a code.
When mounting a new c alculator, it will have to memorize the code anti-start fuction
singularity of this car, then one has to check if the a nti-start function is operational. In
order to do that, the following operations must be done: -the contact is set for a fe w seconds, then it is taken out;
-after t aking out the key, the anti-start function is actived.
I
NSPE CT ING THE ANT I - ST ART FUNCT IO N
Take the key out of the contact and after 10 seconds the anti-start light indicator on the
board must begin to flash on and off. When setting the contact on, the anti-start ing indicator must turn off.
THE INFLUENCE OF THE AIR-CONDITIONINGON THE INJECTION SYSTEM
The air-conditioning installation ( AC) uses a variable cylinder-volume compressor.
There are the following connections between the air-co nditioning and the petrol injection system:
-pin no. 46 of t he injection calculator re ceives the i nformation “ solicit accelera ted
idle mode” when the button for t he air-conditioning i nstallation is pre ssed and the pres-
su re of the freon in the installation is above a limit.
-the i nformation “ absorbed power” does not infl uence the idle m ode re gime, but lets
the calculator know about the value of the couple taken by the compressor, and the calcu-
lator will opera te the step-by-step engine, through pins nos. 12, 41, 42 and 72, in order to
compensate for the couple fall. With the tester it can read in t he m enu : « Parameters l ist «
the power absorbed by the compre ssor, wich will be between 300 and 5000 W. The value
that is re ad will be of m inimum 300 W, irre spective of the coupled / uncoupled state of the
compressor.
-pin no. 10 of the injection calculator will command the E relay located in the fuse-
box of the engine compartment, which will couple the compressor.
The injection calculator c an prohibit the coupling of the AC compre ssor:
-it does not allow the coupling of the compresso r before 10 seconds after the starting of the engine;
-accordi ng to the couple re quired from t he e ngine by the driver - a nd in cert ain
s ituations according to the power absorbed by t he c ompressor - the calculator c an forbid or
authorize the starting of the compressor;
-if the water temperature is higher than, or equal to 11 5
oC, the therm ic prot ection is oper-
ated, which will not authori ze the start ing of the compre ssor; -the overload protection doe s not permit t he coupling of t he compressor when the
revolution ratio of the engine is over 5900 rot/min.
PLACING OF ELEMENTS
vnx.su

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 9
IDLING REGIME ADJUSTMENT DUE TO BATTERY VOLTAGE
The idle mode of t he engine is influenced by the voltage of the battery with a view t o
compensating the voltage fa ll caused by the coupling of the consumers when the battery is
poorly charge d; this imposes an increase in the idle mode revolution ra tio, so the ratio of
the alternator will be incre ased by increasing the charging voltage. The lower the voltage,
the more significant the correction applied, which begins under 12.7 V.
The idle mode regime can thus be incre ased up to 830 rot/min.
If the injection calculator receives the information “command AC coupling”, then the
idle mode revolution ra tio will go up to 850 rot/min.
VA LUES « IDLING RCO « AND « IDLING RCO ADAPTATION «
P
RINCIPL E:
In order to use the information related to the parameters value “PR 021= RCO idling“
and “ PR 022= RCO idling”, the CLIP tester is to be used, which will be connected at the
diagnosis socket and at the vehicle battery ( or lighter socket). Select on tester m enu “COMPUTERS TEST”, then “PETROL INJECTION” . Find then
“FUNCTIONS TEST” and read here the progress of the PR 021 and PR 022 parameters.
In normal operation conditions, warm engine, the value RCO idling ( PR 022 ) is changing
between a maximal a nd a minimal value, so that nominal idling RPM is obtained. It is
possible that further to an operation dispersion ( runni ng in, engine choking up,etc) the
value “RCO idling” to get closer t o the minimal or m aximal value. The adaptive correction (PR 021 ) on “ RCO idling” (PR 022) is allowing r eaching at slow
variations of the engine air necessities, so that “RCO idling” is re-set on an average nominal
value. The parameters PR 021 and PR 022 are progressing among the following limits :
RA TED IDLE MOD E REGIME
(PR 006)
750 rot / min
RCO idling (PR 022)
5% £ X £ 12 % RCO idling
(PR 021)
-3 % .......+7 %
ID
LING REGIME ADJUSTMENT
vnx.su

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 10
In case of an excess (false air, non-conforming attachment of the valve body, etc) the
idling regime will i ncrease and the va lue “ RCO idling” will lower, returning so, at the
nominal idling regime. The value of the (PR 021) parameter will decre ase in orde r to realign idling RCO (PR
022) within the optimal ra nge. In c ase of a lack of air ( choking up, etc) the reasoning is
conversely : RCO idling (PR 022) will i ncrease, and t he va lue i s adjusting RCO idling (PR
022) on a avera ge nominal value.
IMP ORTANT
After battery disconnection/reconnection, it is obligatory engine starting and maintain
it for several minutes i n order to perform a correct resetting of t he adaptive correction
of the RCO idling. IDLING REGIME ADJUSTMENT
vnx.su

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 11
The catalyst efficiency is maximal when the air e xcess value (l ) is within the limits l =
0,97 ...1,03.
The i njection c omputer is adopting the adjustment strategy of the fuel m ixture enriching
in order to observe the a.m. condition. In order to inform the computer about the enriching
degree of t he mixture, the oxygen sensor is used, which is sending an electric signal of a
value oscillating between 150 and 800 mV. When the engine is warm and operating in the « closed loop « stage, the tension generated
by the oxygen sensor must quickly oscillate between 150 +/- 50 m V, corresponding to the
poor mixture and 750+/- 50 mV corresponding to the enriched mixture. The maximal-minimal
range must be as large as possible (at least 500 mV), confirming the sensor good operation.
The correction of the m ixture enri ching may be seen by means of t he CLIP tester, in t he
menu “FUNCTIONS TEST”, sub-menu “ENRICHING ADJUSTMENT” by the parameter
PR 035= enriching corre ction value.
The corre ction value has as limits 0 and 255, the avera ge value being placed at 128.
The interpretation of the parameter PRO 35 value, is the following :
- when it is gre ater than 128 the computer is requesting the mixture enriching- so, the
mixture has been poor.
- when it is smaller than 128, the computer is requesting the mixture penury- so, the
mixture has been ri ch. The en tra nce i n the enri ching adjustment is effective aft er a timing, due to water
temperature greater than 10 C when the acceleration t hrottle i s free ( idling e ngine) and t he
oxygen sensor is enough warm ( over 350 C). Until the moment of e nteri ng in this stage,
the enri ching correction value (PRO 53) will be 128. In the enri ching stage, the injection c omputer will not take i nto a ccount t he va lues
furnished by the oxygen sensor, in the fol lowing situations :
- accelera tion pushed at maximum
-sudden accelera tion
- at decelerating, with free accelera tion pedal inform ation.
- in case of a damaged oxygen sensor.
“DEGENERATED” OPERATION WAY IN CASE OF THE OXYGEN SENSOR DAMAGE
When the tension furnished by the oxygen sensor is not correct ( is changing a little bit
or not at all ), during enri ching adjustment, t he computer will not pass to t he »degenera ted »
operation way unl ess the damage ha s been re cognized a s being present for at least 10
minutes. Only in this case, the damage will be memori zed.
When a damage at the oxygen sensor is detected and if the damage has been already memorized,
then it will pass directly to the « open loop » operation (enriching correction = 128).
ADJUSTMENT OF THE FUEL
MIXTURE ENRICHING
vnx.su

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 12
ENRICHING ADAPTIVE CORRECTION
PRINCIPLE
In the “ closed loop” stage, t he enri ching correction va lue (PR 035) is adjusting the
injection times in order to obtain a ratio as close as possible to the enriching value = 1.
The correction value is close to 128, having as limits 0 and 255; nevert heless, dispersions
of the injection system components may occur, that a re giving the correction a displacement
towards 0 or 255, in order to obtain the enriching value 1.
The a daptive c orrection i s allowing the injection c hart displacement i n order to re -
focus the enri chment adjustment (PR 035) on the 128 value.
The values of the adjustment correction may be read by means of the CLIP tester, as follows :
- connect the tester to the vehicle diagnosis socket and to the battery (or to the lighter socket).
- select
“COMPUTERS TEST” , then “PETROL INJECTION”
- in the menu “FU NCTIONS TEST”, access “ENRICHING ADJUSTMENT”, where
you can find para meters PR 030= enriching a dapting in opera tion (the adaptive corre ction
for the partial and large charge s area) and PR 031= enriching adapting at idling (adapting
correction at idling and in small charges area).
PARAMETER FIELD
Enriching adapting in operation (PR 030) 80% £ X £ 176 %
Enriching adapting at idling (PR 031) 80% £ X £ 176 % ENRICHING ADAPTIVE CORRECTION
vnx.su

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 13
If values PR 030 and PR 031 are fixed on value 128 (after battery disconnecting/
reconnecting) t hen it is necessary to perform a specifi c road test, observing the following
conditions. The a daptive c orrections are active only when the engine is warm in t he « c losed l oop »
s tage (when PR 035 is variable) on an exactly range of the depression from the inlet manifold.
It is ne cessary that e ngine ha s been run in «c losed loop » in m ore than one a reas of the i nlet
pressure, for which the adaptive corre ctions begin to progress in order to compensate the
enrichment from the engine opera tion.
ROAD TEST
This is performed in the following conditions : - warm engine (water tempera ture gre ater than 75
0 C)
- engine RPM not greater than 4800 rot/minute
driving on road, for a normal drive, on 5… 10 km distance.
For this test, it is recommended to start from an engine low regime, in III-d or IV-th
gear, with a gradually acceleration so that desired pressure gets stabilized i n t he i nlet
manifol d for 10 seconds in each are a, as per the following table :
Average 255 Average 416 Average 546 Average 676 Average 807
Area 1 Area 2 Area 3 Area 4 Area 5
(mbar) (mbar) (mbar) (mbar) (mbar)
247----------- 351 --------------- 481 --------------- 611 --------------- 741 --------873
Fu rther to this road test, the corre ctions must become valid.
Read again the values of t he PR 030 a nd PR 031 para meters. These, initially being at
128, have been c hanged after this road test. If not , pe rform again this operation, stri ctly
observing the test perform ing conditions. ENRICHING ADAPTIVE CORRECTION
vnx.su

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 14
RO
AD TEST RESULTS INTERPRETATION
In case of fuel l ack (choking up injectors, pressure and fuel flow too small, etc) the
value of t he PR 035 para meter shall i ncrease, in order that an enrichment a s close as
possible to 1 is obtained, and the values PR 031 and PR 030 shall increase so that PR 035
is reaching a value around 128. For a correct operation it i s recommended c hemical or ultra sonic cleaning of the injectors
each 30 000 km. In case of a fue l e xcess (not sealed injectors or t heir needle is not properl y closing ..) the
reasoning is conversely: the values of PR 035, PR 031 and PR 030 parameters shall decre ase
to enable bringing the PR 035 to a value around 128.
OBSERVATION
The values read for PR 030 and PR 031 are offering an opinion about the air/ petrol
mixture t he e ngine is runni ng with. In order t o be useful at diagnosis, we c an not c onclude
unless the values a re on maximum or on minimum and their di splacement is i n t h same
direction. These values must be analyzed only in case of a client claiming an operation
defect and if they are on the maximum or minimum values, related with the PR 035 values,
greater than 175 or smaller than 80. ENRICHING ADAPTIVE CORRECTION
vnx.su