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486 PL ENGINE
P
Fig. 10
e) Cam shaft phase sensor
Fig. 10
It senses the cam shaft position. It is mounted
on rear side of the cylinder head towards intake
camshaft side.
ELECTRONIC CONTROL UNIT (ECU)
FUNCTION :
It is the heart of the petrol injection system. It
receives different engine parameters in the form of
electrical signals and decides on the optimum
air/fuel ratio required by the engine.
WORKING :
1.
The ECU receives electrical signals from
different sensors.
2.
These signals are then converted to digital
signal with the help of analog to digital
converters.
3.
The ECU calculates the optimum air / fuel ratio
required by the engine.
4.
It converts the signals back to the analog form
and sends it to the injectors.
5.
The injectors remain open for a specified time.
6.
The time depends upon the supply of voltage
from the ECU.
7.
In this fashion the optimum air/fuel ratio is fed
into the cylinders.
CAUTIONS :
1.
Please don’t fix any washer on knock
sensor.
2.
Put cable tie for phase sensor cable in order
to avoid touching hot EGR pipe.
3.
High tension (HT) cables should be routed
such that it should not foul with EGR pipe.
4.
Fit the (high tension) HT cables in their
respective bracket to avoid friction with fuel
return line.