Chery QQ Service Manual download pdf (Page 68)

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

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

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.

Repair the fuel

supplying

system

Yes Next step

Check spark plugs in every cylinder and observe its type

and clearance if it is accord with the regulation.

Adjust or

replace

Yes

Clean related

part

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

Inspect air intake pressure sensor, throttle position sensor

and its line if it is working correctly.

Repair line or

replace sensor

Yes

Replace fault

part6

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

Check fuel conditions and check if the failure is appeared

after the fuel refilling

No Next step

Yes Next step

Check the engine ignition order and ignition timing if it is

accord with the regulation.

Repair ignition

timing

Yes Next step

9 Check the exhaust pipe if the air exhausting is smooth

Repair or

replace exhaust

pipe

Yes Diagnosis help

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.

Repair

corresponding

line

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