Chery A21 2005, Service Manual, Page: 387 / 475

CHERY
·
A21 SERVICE MANUAL ENGINE EFI SYSTEM
64
12. React slowly when it is accelerated.
General failure component: 1) water in fuel; 2) air intake pressure sensor and throttle
position sensor; 3) spark plug; 4) throttle valve and idle speed by pass port; 5) air intake
port; 6) idle speed regulator; 7) injector; 8) ignition timing; 9) exhaust pipe.
General diagnosis flow:
No. Operating steps Result Follow up steps
Yes
Repair the air
intake system
1 Check the air cleaner if it is jammed.
No Next step
Yes Next step
2
Connect the fuel pressure meter ( connecting point is the
front end of fuel distributing pipe assembly fuel intake
pipe); start the engine and check fuel pressure at idle speed
if it is around 260kpa; take off the vacuum pipe from fuel
pressure regulator check the fuel pressure if it is around
300kpa.
No
Repair the fuel
supplying
system
Yes Next step
3
Check spark plugs in every cylinder and observe its type
and clearance if it is accord with the regulation.
No
Adjust or
replace
Yes
Clean related
part
4
Disassemble idle speed regulator and check throttle valve,
idle speed regulator and idle speed by pass port if there is
carbon deposition.
No Next step
Yes Next step
5
Inspect air intake pressure sensor, throttle position sensor
and its line if it is working correctly.
No
Repair line or
replace sensor
Yes
Replace fault
part 6
Disassemble the injector, check the injector using the
injector special cleaning analysis meter and observe if it is
leaking or jammed. No Next step
Yes Replace fuel
7
Check fuel conditions and check if the failure is appeared
after the fuel refilling
No Next step
Yes Next step
8
Check the engine ignition order and ignition timing if it is
accord with the regulation.
No
Repair ignition
timing
Yes Next step
9 Check the exhaust pipe if the air exhausting is smooth
No
Repair or
replace exhaust
pipe
Yes Diagnosis help
10
Connect EFI system adaptor, turn on the ignition switch;
check the power supply of pin No.12, 13, 44, 45 and No.63
if it is in right conditions; check pin armature of No.3, 51,
53, 61 and No.80 if it is in right conditions.
No
Repair
corresponding
line
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