Chery QQ Service Manual download pdf (Page 22)

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

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.

 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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