CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM
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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
part3
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
