Dacia 1304 2004, Руководство по ремонту

Страница: 141 / 654

17
IGNITION AND INJECTION
17 - 5
1 - The upper part (hydraulic part)
2 -
The lower part (body-valve)
3 - Pressure regulator
4 - Injector
5 - Air sensor T
6 - Fuel input ( supply connection ).
7 - Fuel output ( back-feed connection )
8 - Idle motion regulator
A = Connector for air sensor T aer and
injector.
B = Connector for valve potentiometer.
C = Connector for idle motion breaker and
valve positioning engine.
INJECTION CENTRAL UNIT
PRESSURE REGULATOR
It is a mechanical membrane regulator which insures an injection pressure of
0,8 – 1,15
bar
, the engine being under motion.
The pressure is measured as follows:
- a
T
connection and a manometer of
0 – 4 bar
are connected to the fuel input
connection into the valve body;
- the pump is supply by starting the engine or by shunting the terminals
30
and
87
of the relay
R1
, with both engine and contact OFF.
AIR TEMPERATURE SENSOR ( AIR T )
The air T sensor (
5
) – (
drawing 4
) measures the temperature of the air sucked by the
engine.
Knowing that the air density decreases with the temperature increasing, the electronic
control unit will correct the injection time (
t
i
), in order to maintain the report air/fuel at
optimal values.
The air sensor T is a NTC type (temperature negative coefficient), which means that
its internal resistance decreases with temperature increase. It is supplied with
U = 5 V
(pin
13
, computer).
Reference values:
R = 1450 – 3300 Ù at 15 – 30 °C
R = 2500 ± 125 Ù at 20 °C
The injection central unit consists of:
Fig. 2
DESCRIPTION OF THE SYSTEM
vnx.su