Chery QQ Service Manual download pdf (Page 4)

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

not disassemble the fuel pump at random when carrying out service for fuel system.

Before disassemble the fuel pipe please carry out discharge pressure procedure. The

method is as below: Disassemble the fuel pump relay (or disconnect the connector plug),

start engine at its idle running and it dies out by itself. After the service supply fuel to

engine fuel pipe at first, the method is: turn ignition key to ON position and wait a while,

repeat this four or five times. Disassembly of fuel pipe and fuel filter should be carried

out at a place with good ventilation and done by professional maintainer.

● Do not give electricity to fuel pump when the electrical pump is taken out of fuel tank in

order to prevent from electrical spark and cause fire.

● Fuel pump is not allowed to carry out running test at dry or water situation, which will

decrease its life. And do not exchange anode and cathode of the pump.

● Carry out jump spark inspection at necessary time when inspect the ignition system, and

the time to inspect must be short. Do not open the throttle valve to prevent a lot of

unburned gasoline entering exhaust pipe and damage the 3-way catalytic converter ( It is

better to take off the corresponding injector insert during the jump spark testing)

● The adjustment of idle speed is done completely by EFI without manual work. The

accelerator stop screw of throttle valve has been fixed well in advance by manufacturer so

that it is not allowed to change it original position by the customer.

● Do not exchange the anode and cathode of the accumulator to prevent damaging the

electronic component. This system uses cathode ground.

● Do not disassemble accumulator cable when the engine is running.

● Disassemble the cable of accumulator anode and cathode, and ECU when there is welding

work on the car.

● Do not inspect the input and output signal of component by impaling the lead surface.

1.3. SERVICE TOOLS

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Chery QQ Service Manual Page 4