Dacia SuperNova (engine E7J). Manual - part 26

 E7J-A-2/60 ENGINE

17

IGNITION AND INJECTION

17 - 14

ROAD TEST RESULTS INTERPRETATION

In case of fuel lack (choking up injectors, pressure and fuel flow too small, etc) the

value of the PR 035 parameter shall increase, in order that an enrichment as 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 is recommended chemical or ultrasonic cleaning of the injectors

each 30 000 km.

In case of a fuel excess (not sealed injectors or their needle is not properly closing ..) the

reasoning is conversely: the values of PR 035, PR 031 and PR 030 parameters shall decrease
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 the engine is running with. In order to be useful at diagnosis, we can not conclude
unless the values are on maximum or on minimum and their displacement is in th 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

 E7J-A-2/60 ENGINE

17

IGNITION AND INJECTION

17 - 15

INTRODUCTION

In order to achieve the communication between the injection calculator

and 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

will 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 not 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 imperfect connections at the injection system cabling.

4. Starting the  engine with the battery connected to a starting robot is not

allowed.

5. Recharging the battery will only be done after disconnecting it from the

car cabling, and it will be done using a 12V charging-station.

DIAGNOSING-INTRODUCTION

 E7J-A-2/60 ENGINE

17

IGNITION AND INJECTION

17 - 16

STEPS IN DIAGNOSING

INSPECTION OF DEFECTS

This stage is the indispensable starting-point before any intervention on the car. if the

defect is indicated by the tester, then remedy it; if no defect has been signalled by the
tester, a conformity inspection will have to be made, thus helping to spot the possible
causes.

To do that check on the following elements:

- the electric circuit corresponding to the defect which has been signalled;
- the electric connectors along the circuit (oxidized spots, deformed plugs, etc.);
- the electric resistance that is not in keeping with the element connected to that

electric circuit;

- the state of the plugs (cut or worn-out insulation, areas with traces of pressing, etc.).

CONFORMITY INSPECTION

Its aim is to check on the various states and parameters, to detect some anomaly when

the tester failed to find defects.

This phase allows:

- to diagnose a breakdown or failure without displaying the defect corresponding 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 after the repair has been made.

So, this heading concerns a diagnosing of the various states and parameters, under

certain inspection conditions.

If a state is defective or a parameter is beyond tolerance, the corresponding 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 inspection of conformity) the cause of the user’s complaint has not been elimi-
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

 E7J-A-2/60 ENGINE

17

IGNITION AND INJECTION

17 - 17

DEFECTUL

  1 Lack of communication with the calculator

17-17

  2 Calculator

17-18

  3 Supply

17-19

  4 Circuit of command actuator relay

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 pressure sensor

17-30

16 Circuit of idle mode adjustment

17-31

17 Circuit of clapper potentiometer

17-32

18 Circuit of water-temperature sensor

17-33

19 Circuit of air-temperature 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 information

17-39

25 Circuit of command air-conditioning compressor relay

17-40

26 Water-temperature warning circuit

17-41

27 Circuit of command low-speed ventilator relay (air-conditioned 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

DIAGNOSING-INTERPRETING THE DEFECTS