Chery A21 2005, Service Manual, Page: 385 / 475

CHERY
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A21 SERVICE MANUAL ENGINE EFI SYSTEM
62
10. Regular starts with high idle speed.
General failure component: 1) throttle valve and idle speed by pass port; 2) vacuum
pipe; 3) idle speed regulator; 4) coolant temperature sensor; 5) ignition timing.
General diagnosis flow:
No. Operating steps Result Follow up steps
Yes Adjust
1 Check accelerator cable if it is blocked or over tightening
No Next step
Yes
Repair the air
in taking
system
2
Check the air intake system and its connecting vacuum pipe
if it is leaking.
No Next step
Yes
Clean related
part 3
Disassemble the idle speed regulator and check the throttle
valve and idle speed by pass port if there is carbon
deposition No Next step
Yes
Repair line or
replace sensor
4
Take off the coolant temperature sensor joint; start the
engine and observe if it has high idle speed.
No Next step
Yes Next step
5
Check the engine ignition timing if it is accord with the
regulations.
No
Repair the
ignition timing
Yes Diagnosis help
6
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 the
corresponding
line
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