DACIA SUPERNOVA 2004 Repair Manual

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
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IGNITION AND INJECTION
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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
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IGNITION AND INJECTION
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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
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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
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IGNITION AND INJECTION
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INTRODUCTIONIn order to achieve the communication between the injection calculator
a nd the diagnosing tester SAGEM CLIP, the following operations will be
performed:
- the glove compartment is opened and the plastic shield of the diag-
nosing plug, located at the top of the compartment, is taken off; - the tester is connected at the diagnosing plug and across the termi-
nals of the car battery; - the type of the vehicle is selected on the tester;
- the option “Calculator test” is then selected;
- the menu “Injection” is selected.
CAUTION!
1. Connecting or disconnecting the injection calculator to the car cabling
wi ll only be done when the engine is stopped and the car is off-contact.
2. If the contact is on or the engine is running, the terminals of the battery
will no t be loosened or disconnected. Replacing the battery on the car is not
allowed if the engine is running or the contact is on.
3. Loose or oxidized contacts are not allowed at the terminals of the battery,
or im perfect connections at the injection system cabling.
4. Starting the en gi ne with the battery connected to a starting robot is not
allowed. 5. R echarging the batt ery will only be done after disconnecting it from the
car cabling, and it will be done using a 12V charging-station.
DIAGNOSING-INTRODUCTION
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IGNITION AND INJECTION
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S
TEPS IN DIAGNOSING
INSPECTION OF DEFECTS
This stage is the indispensable start ing-point before any intervention on the car. if the
defect is indicated by the t ester, then remedy it; if no defe ct ha s been signalled by t he
tester, a conformity inspection will ha ve to be made, thus helping t o spot the possible
causes. To do that check on the fol lowing elements:
- the electric circuit corre sponding to the defect which has been signalled;
- the electric connectors along the circuit (oxidized spots, deform ed plugs, etc.);
- the e lectric re sistance that is not i n keeping with the element connected to that
electric circ uit; - the state of the plugs (cut or worn-out insulation, areas with traces of pressing, etc.).
CONFORMITY I NSPECTION
Its aim is to check on the various states and parameters, to detect some anomaly when
the tester failed to find defe cts.
This phase allows:- to diagnose a breakdown or failure without displaying the defe ct corre sponding to
a deficient functioning of the parts or following complaints from the user. - to check the good functioning of the injection system and to ensure no breakdown
or failure will appear immediately aft er the repair ha s been made.
So, this heading concerns a diagnosing of the various states and parameters, unde r
certain inspection conditions.
If a state is defective or a parameter is be yond tolerance, the corre sponding diagnose
page will have to be consulted.
LOCALIZING A DEFECT AFTER USER’S COMPLAINT
If after the inspection of the injection system by means of the CLIP tester (inspection of
defects and i nspection of conform ity) the cause of the user’s c omplaint ha s not be en e limi-
nated, then the logical schema of finding out of the possible causes of the problem will be
used. These schemas will only be used under the following circumstances:- no defect has been shown by the tester;
- no anomaly has been signalled by the inspection of conformity;
- the car does not work properly. DIAGNOSING-INTRODUCTION
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E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
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DEFECTUL
1 Lack of c ommunication with the calculator 17-17
2 Calculator 17-18
3 Supply 17-19
4 Circuit of command actuator re lay 17-20
5 Circuit of command petrol -pump relay 17-21
6 Circuit of 1 cylinder injector 17-22
7 Circuit of 2 cylinder injector 17-23
8 Circuit of 3 cylinder injector 17-24
9 Circuit of 4 cylinder injector 17-25
10 Circuit of 1 and 4 ignition coil 17-26
11 Circuit of 2 and 3 ignition coil 17-27
12 Revolution ratio sensor information 17-28
13 Anti-start device 17-29
14 Failure to memorize the anti-start code 17-29
15 Circuit of atmospheric pre ssure sensor 17-30
16 Circuit of idle mode adjustment 17-31
17 Circuit of clapper potentiometer 17-32
18 Circuit of water-t emperature sensor 17-33
19 Circuit of air-t emperature sensor 17-34
20 Circuit of canister draining valve 17-35
21 Circuit of oxygen probe 17-36
22 Circuit of oxygen probe heating 17-37
23 Circuit of detonation probe 17-38
24 Car speed inform ation 17-39
25 Circuit of command air-c onditioning compressor relay 17-40
26 Water-temperature warning circuit 17-41
27 Circuit of command low-speed ventilator relay (air-c onditioned car) 17-42
28 Circuit of command high-speed ventilator relay (air-conditioned car) 17-43
29 Circuit of command ventilator relay (air-conditioned car) 17-44
30 Functional failure of oxygen probe 17-45
31 Pollutant combustion misfire / Disruptive combustion misfire 17-46
32 Combustion misfire at cylinders 1, 2, 3 and 4 17-47
DIAG NOSING-INTERPRETING THE DEFECTS
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IGNITION AND INJECTION
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DIAG
NOSING-INTERPRETING THE DEFECTS
LACK OF COMMUNICATION WITH THE CALCULATOR
LACK OF
COMMUNICA-
TION
SUGGESTIONS
Try the tester on a different car
Check:
- the connection between the tester and the diagnosing plug (state of the cable)
- the fuse s S3 and S4 in the engine compartment, and S15 in the passenger cabin.
Remedy if necessary.
Check at the diagnosing plug the presence of +12V for pin 16 and the mass for pin 5.
Remedy if necessary.
Connect the 90-way terminal-tester instead of the injection calculator and check the
insulation, the continuity and the absence of parasitic resistances along the following
ci rcu its:
-pin 28 of calc ulator ♦ mass
-pin 33 of calc ulator ♦ mass
-pin 3 of calculator ♦ mass
-pin 56 of calculator ♦ pin 7 of diagnosing plug
-pin 28 of calculator ♦pin 15 of diagnosing plug
-pin 28 of calculator ♦fuse S3 in the engine compartment
-pin 28 of calculator ♦ fuse S4 in the engine compartment.
Remedy if necessary.
AFTER
REPAIR
1.
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IGNITION AND INJECTION
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DIAG
NOSING-INTERPRETING THE DEFECTS
DEFECT
PRESENTCOMPUTER
1. Brea kdown computer
2. Brea kdown zones memory of protection
3. Breakdown zones memory antistarting up
SUGGESTIONS
Non-conforming or faulty calculator
Change the calculator
Do not immediately change the calculator
Perform the following procedure:
- set the contact and enter a dialogue with the calculator
- erase th e defect memorized by th e calculator
- take contact and wait till the dialogue with the calculator is lost
- se t contact and enter a dialogue with the calculator.
If the defect is still there, redo this procedure.
If after the fifth attempt of erasing the “calculator” defect is still
there, change the injection calculator.1.
2.
AFTER REPAIR Erase memorized defects.
2.
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IGNITION AND INJECTION
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DIAG
NOSING-INTERPRETING THE DEFECTS
DEFECT
PRESENT
OR MEMO-
RIZED3.SUPPLY
1. Breakdown + 12V after the actuator relay 238 (D)
2. Breakdown + 12V after the contact (D.C)
SUGGES TIONSConditions of breakdown detection by the calculator:
-tak e the contact and wait till dialogue with the tester is lost
-put the contact and enter dialogue.
Conditions of performing the diagnosing:
-defec t is present.
Check the state of the battery and the connections to the mass.
Remedy if necessary.
Check the connecting and the state of the connector of 238 relay.
Change the connector if necessary.
Check the presence of +12V at the pole 3 of 238 relay.
Remedy the circuit to fuse S
1.
Take plug 5 out of the connector of 238 relay.
Check, after setting the contact, the presence of +12V at the pole 5 of
238 re lay.
Change relay if necessary.
Check insulation and the continuity of the circuit:
pin 66 of calculator
® pole 5 of actu ator relay 238.
Remedy if necessary.
Disconnect an element at a time (injector, canister draining valve, probe
O
2) and check the presence of +12 V for each of them.
Change the faulty element.
1.
2. The defe
ct is not active because it causes the loss of dialogue with the
tester
AFTER REPAIR
Er ase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.
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