2004 DACIA SUPERNOVA air condition

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
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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
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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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E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 16
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
17 - 17
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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E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 20
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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E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 21
DIAG
NOSING-INTERPRETING THE DEFECTS
CIRCUIT OF COMMAND ACTUATOR RELAY
1. Circuit of command or short-circuit to the mass of the circuit to-
wards pin 39 of the calculator
2.
Short-circ uit a t 12V a long the c irc uit tow a rds p in 39 of the c a lc ula tor
4.
SUGGESTIONSConditions of breakdown detection by the calculator:
-tak e the contact and wait till dialogue with the tester is lost
-put th e contact and enter dialogue.
Condition of performing the diagnosing:
-defec t is present.
REMARK : This defect has priority and should be dealt with be-
fore the following ones.
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 1 of 238 relay.
Remedy the circuit to fuse S
1 in the engine compartment.
Check the coil of the 238 actuator relay.
Change relay if necessary.
Connect the 90-way terminal-tester instead of the calculator and check the insulation and
the continuity along the circuit:
pin 39 of calculator
♦ pole 2 of actu ato r r elay 2 38.
Remedy if necessary.
The proble m is not yet solved! Consequently, the injection calculator must be changed.
CAUTION! The destruction of the calculator has probably been caused by an electric shock.
The cause of the destruction must be found before mounting a new
calcul ator.
AFTER REPAIR Er
ase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.
DEFECT
PR ESENT
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E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 22
DIAG
NOSING-INTERPRETING THE DEFECTS
CIRCUIT OF COMMAND PETROL PUMP
1. Open circuit or short-circuit to the mass of the circuit towards pin 68 of the c alculator
2. Short-circuit at 12V along the circuit towards pin 68 of the calculatorDEFECT
PRESENT
SUGGESTIONS
Conditions 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.
Condition of performing the diagnosing:
-defec t is present.
REMARK : This defect has priority and should be dealt with before
the following ones.
Check the connection and the state of the 236 petrol pump connector.
Change connector if necessary.
Check, after setting the contact, the presence of +12V at the pole 1 of 236 petrol pump.
Remedy if necessary.
Connect the 90-way terminal-tester instead of the calculator and check the insulation
and the co ntinuity along the circuit:
pin 68 of calculator
♦ pole 2 of the 236 petrol pump.
Remedy if necessary.
Check the coil of the 236 petrol pump.
Remedy if necessary.
The prob lem is not yet solved! Consequently, the injection calculator must be changed.
CAUTION! The destruction of the calculator has probably been caused by an
electric shock.
The cause of the destruction must be found before mounting a new
calculator.
AFTER
R EPAIREr ase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.
5.
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