Dacia SuperNova (engine E7J). Manual - part 24

 E7J-A-2/60 ENGINE

17

IGNITION AND INJECTION

17 - 6

The water - temperature sensor

This sensor (no.1) sends the information concerning the water temperature to the calcu-

lator, and other information is sent to the on-board indicator, which will display water
temperature.

In case of emergency regarding water temperature, the calculator will command the

lighting of the water-temperature alert indicator on the board.

In keeping with the water-temperature information received by the calculator, it will

command:

-the injection system;
-the relays for the command of the motor-ventilator engine cooling group.

When setting the contact on, the water temperature indicator, placed on the instrument

panel, shall be lighted for 3 seconds then it shall turn off.

1

So, after setting the contact off, during next 2 minutes from engine stopping, the water

temperature reaches the value of 102 C and the injection computer is then controlling the
cooling blower starting at low speed.

When the temperature is lowering at 96 C, the blower will be stopped ; its operation

must not be over 10 minutes after engine stopping.

PLACING OF ELEMENTS

 E7J-A-2/60 ENGINE

17

IGNITION AND INJECTION

17 - 7

INJECTION-DISRUPTION LIGHT INDICATOR

THE SYSTEM PARTICULARITIES ( ANTI-STARTING INDICATOR )

On setting the contact, the injection calculator receives from UCE DECODING DE-

VICE a code, which is then compared with the one previously memorized; if the two
codes are the same, then the starting of the engine is authorized.

After the setting of the contact, the anti-start light indicator, which until then was flash-

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.

Observation:
For details regarding the vehicle anti-starting system, see chapter «  Anti-starting

System » from the Workshop manual SupeRNova – vol.2, ed.I)

PLACING OF ELEMENTS

 E7J-A-2/60 ENGINE

17

IGNITION AND INJECTION

17 - 8

THE ANTI-START FUNCTION

R

EPLACING

 

UCE

 

INJECTION

 

CALCULATOR

The UCE injection calculator is delivered without a code, but it is able to memorize a code.
When mounting a new calculator, it will have to memorize the code anti-start fuction

singularity of this car, then one has to check if the anti-start function is operational. In
order to do that, the following operations must be done:

-the contact is set for a few seconds, then it is taken out;
-after taking out the key, the anti-start function is actived.

I

NSPECTING

 

TH E

 

ANTI

 - 

START

 

FUNCTION

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-starting indicator must turn off.

THE INFLUENCE OF THE AIR-CONDITIONING

ON THE INJECTION SYSTEM

The air-conditioning installation (AC) uses a variable cylinder-volume compressor.
There are the  following  connections between the  air-conditioning and the petrol injection system:

-pin no. 46 of the injection calculator receives the information “solicit accelerated

idle mode” when the button for the air-conditioning installation is pressed and the pres-
sure of the freon in the installation is above a limit.

-the information “absorbed power” does not influence the idle mode regime, but lets

the calculator know about the value of the couple taken by the compressor, and the calcu-
lator will operate 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 the menu : « Parameters list « 
the power absorbed by the compressor, wich will be between 300 and 5000 W. The value
that is read will be of minimum 300 W, irrespective 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 can prohibit the coupling of the AC compressor:

-it does not  allow the coupling of the  compressor before 10 seconds after the starting of the engine;
-according to the couple required from the engine by the driver - and in certain

situations according to the power absorbed by the compressor - the calculator can forbid or
authorize the starting of the compressor;
-if the water temperature is higher than, or equal to 115

o

C, the thermic protection is oper-

ated, which will not authorize the starting of the compressor;

-the overload protection does not permit the coupling of the compressor when the

revolution ratio of the engine is over 5900 rot/min.

PLACING OF ELEMENTS

 E7J-A-2/60 ENGINE

17

IGNITION AND INJECTION

17 - 9

IDLING REGIME ADJUSTMENT DUE TO BATTERY VOLTAGE

The idle mode of the engine is influenced by the voltage of the battery with a view to

compensating the voltage fall caused by the coupling of the consumers when the battery is
poorly charged; this imposes an increase in the idle mode revolution ratio, so the ratio of
the alternator will be increased 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 increased up to 830 rot/min.
If the injection calculator receives the information “command AC coupling”, then the

idle mode revolution ratio will go up to 850 rot/min.

VALUES  «  IDLING RCO «  AND  «  IDLING RCO ADAPTATION « 

P

RINCIPLE

:

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 menu “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 and a minimal value, so that nominal idling RPM is obtained. It is
possible that further to an operation dispersion ( running in, engine  choking up,etc) the
value “RCO idling” to get closer to the minimal or maximal value.

The adaptive correction (PR 021 ) on “RCO idling” (PR 022) is allowing reaching 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 :

RATED IDLE MODE REGIME

(PR 006)

750 rot / min

RCO idling

(PR 022)

5% £ X  £ 12 %

RCO idling

(PR 021)

-3 % .......+7 %

IDLING REGIME ADJUSTMENT