Dacia 1304 2004, Repair Manual

Page: 144 / 654

IGNITION AND INJECTION
17
17 - 8
Fig. 3
The valve potentiometer consists of a first potentiometer, working on the range
(0° - 22°) and a second one, working on the range (19° - 90°). A common area is noticed,
between (19° - 22°) established for a more precise reading of the load necessary in the
partial load area, the most used for the engine exploitation.
The connector of the valve potentiometer consists of the following connections (
drawing 2
):
1 - Mass ( pin 27 computer )
2 - Potentiometer I ( 0
0
- 22
0
)
3 - Blank
4 - Potentiometer II ( 19
0
- 90
0
).
5 - Supply ( 15 V , pin 25 computer ).
In can be checked by means of means of an oscilloscope as follows:
- engine on contact;
- manual moving of the control clutch lever;
- oscilloscope contacted to the pins
1
and
2
of the connector; if the displayed sign
looks like a row of horizontal straight lines with no interactions the potentiometer is ready
to use (
drawing 10
)
In case of damage, the potentiometer is not to be repaired – the lower part of the injection
central unit is to be replaced.
The wires of the potentiometer connector should be checked by an ohmmeter. The
following values are indicated for a good potentiometer:
- potentiometer
I
R
1-5
= 600 – 1400 Ù
- potentiometer
II
R
2-4
= 400 – 4000 Ù ;the maximal values should
contact each other within the partial load area.
Fig.4
DESCRIPTION OF THE SYSTEM
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