
CHERY
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A21 SERVICE MANUAL ENGINE EFI SYSTEM
21
has different flow according to the
requirement of engine, but with the same
exterior looking.
The pump which can be assembled to perhaps
is not the fittest. For service the replaced
electric fuel pump must has the same part
number as the original pump; 2, do not change
the pump at dry status to prevent the pump
from accident; 3, when it needs changing fuel
pump, please clean fuel tank and fuel filter.
l
Simple measuring method: (disconnect joint)
leave digital multimeter at ohm shift, connect
two meter pen to two pins of pump, measure
the resistance, it is not zero or infinite(that is
non short circuit, open circuit).(connect the
joint)connect the fuel pressure meter to fuel
intake pipe and start the engine, observing if the
fuel pump works; If it is not running, check if
there is power or not on the pin of
”
+
”
; if it is
running, at the condition of idle speed, check
the fuel pressure if it is around 260kPa; plug
off the fuel pressure regulator vacuum pipe if it
is around 300kPa.
3.8 ELECTROMAGNETIC INJECTOR
1)Exterior drawing and pin
There are two pins on each injector. One of them is
No. 87 pin aside of casing marked with plus and
connected to main relay output; and another one
connect with ECU No. 27,6,7,47 pins.
2)Installation position
: On the air intake manifold
near
the
end
of
air
intake
port.
When
you .disassemble and reassemble the fuel injector
the O ring must be changed. And pay attention not
to damage the sealing surface of the injector.
3)Purpose:
Inject some fuel to its correspondent
cylinder at proper time to meet the engine
requirement of different power and different torque.
4)Working principle:
ECU sends electrical
impulse to injector coil and form magnetic field
force. When magnetic field force increase to
Chart 3-14 Exterior Drawing of Injector
1, O Ring
2, Screen
3, Injector with Elec. Plug
4, Coil
5, Spring
6, Valve Pin with Coil Armature
7, Valve Seat with Injection Hole
Chart 3-15 Cutaway View Of Injector
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Содержание A21 2005
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