CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM
62
6. Regular starts but the idle speed is not steady at any time.
General failure component: 1), water in fuel; 2), injector; 3), spark plug; 4), throttle
valve and idle speed by pass port; 5), air intake port; 6), idle speed regulator; 7),
ignition timing; 8), spark plug; 9), engine mechanical.
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; check the air intake
port if it is leaking.
No Next step
Yes
Clean or
replace
2 Check idle speed regulator if it is partial blocked
No Next step
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 Cleaning
4
Check the throttle valve and idle speed by pass if there is
carbon deposition.
No Next step
Yes Replace part
5
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 Change fuel
6
Check fuel conditions and check if the failure is appeared
after the fuel refilling
No Next step
Yes Trouble shoot
7
Check pressure conditions of every cylinder and observe if
there is big pressure difference between the cylinders.
No Next step
Yes Next step
8
Check the engine ignition order and ignition timing if it is
accord with the regulation.
No
Repair the
ignition timing
Yes Diagnosis help
9
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
