Chery A21 2005, Service Manual, Page: 326 / 475

CHERY
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A21 SERVICE MANUAL ENGINE EFI SYSTEM
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EFI SERVICE MANUAL
A21 car is equipped with ME7.9.7 EFI system which developed by UAES. This manual will
introduce the general service and the operational principle and character of sensor elements
of EFI system in detail. At last there will be some diagnostic method and flow for the typical
problems.
1. NOTICE TO THE EFI SYSTEM SERVICE
1.1. GENERAL SERVICE
●
Digital multimeter is the only permitted instrument to inspect the EFI system.
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Please use the quality spare parts for service, otherwise can not make sure the EFI work
properly.
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Please use lead free gasoline during service.
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Please be obedient to the service and diagnose flow.
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It is forbidden to disassembly the EFI part during service.
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It should be careful to take the electronic component (ECU, sensor, etc.) for preventing
from dropping to the ground.
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Please protect the environment, deal with the rejectamenta carefully and effectively.
1.2. NOTICE DURING THE SERVICE
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Do not disassemble any part or inserts of the EFI system from its original position at
random to prevent from damaging parts or that moisture and dirt oil come into the inserts.
And that will keep the system from working properly.
●
Please leave the ignition switch at shut off position when you disconnect and connect the
inserts otherwise it will damage the electric element.
●
It is must keep the ECU under 80
℃
, when you do the work of hot status simulation and
other works which may cause the temperature increase.
●
The supplying oil pressure is high(around 300kPa), all the fuel pipe is made up of anti
high pressure pipe. There is high pressure in fuel pipe even the engine does not run. So do
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
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