CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM
65
9. Regular starts but idle speed is not steady or dying out when there is partial loading.
General failure component: 1) air conditioner system; 2) idle speed regulator; 3)
injector.
General diagnosis flow:
No. Operating steps Result Follow up steps
Yes
Cleaning the
related parts1
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 To step No.4
2
Observe if the engine output power increased when
the air conditioner is switched on, that is using EFI
system diagnosis meter observing ignition angle of
advance, fuel injection pulse width and changes of air
intake flow.
No Next step
Yes Next step
3
Connect EFI system adaptor; break connecting line of
ECU pin No.75; check the cable end if it is up level
signal when the air conditioner is switched on.
No
Repair air
conditioning
system
Yes Next step
4
Check air conditioning system pressure; check the
compressor solenoid clutch and air conditioner
compressor pump fuel conditions and check if it is
working correctly.
No
Repair the air
conditioning sys.
Yes Replace fault part
5
Disassemble the injector, check the injector using the
injector special cleaning analysis meter and observe if
it is leaking or jammed or overflowing.
No Next step
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
