Chery S11 / Chery QQ. Manual - part 239

 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

Yes 

Repair or replace 
fuel pipe 

15  

Check returning fuel pipe is blocked or bend. 

No Replace 

pressure 

regulator 

Yes Replace 

or 

cleaning 

16  Check if exhaust system and TWC is blocked   

 

No Replace 

ECU 

 
14）Poor performance of acceteration and powerlessness 

Yes Repair 

1 

Check if it exists malfunction as following: clutch 
slipping, air pressure of tire is low, braking drag, 
size of tire and four-wheeled alignment are 
miscorrect  

No Next 

Yes Next 

2 

Check if throttle can full-open 
 

No 

Rpair or replace 
throttle 

Yes Eliminate 

malfunction 

3 

Turn on ignition key.Use diagnostic equipment to 
check if malfunction information record exists。 

No Next 

Yes Next 

4 

Run engine at idle. After coolant temperature 
reaches normal, groun pin 51 on ECU and check if 
ignition advance angle is 6.75 

　

crank angle. 

 

No Adjust 

ignition 

advance angle 

Yes Next 

5 

Turn on ignition key. Connect adaptor between 
ECU and harness. Check if voltages on pin 7,53,44, 
45, 28 (output signal for MAP, TPS, IAT, ECT and 
oxygen sensor), 28,30(signal ground connection for 
sensor) and pin 12 (for 4.5-5V power of sensor) are 
normal 

No 

Repair or replace 
harness 

Yes Next 

6 

Check if intake pressure is 35—65 kPa at idle after 
start 

No Repair 

Yes Next 

7 

Connect fuel pessure gauge valve. Short pin 30 on 
fuel pump relay and pin 87 to start fuel pump. 
Check if fuel pressure is 250—300 kPa 

No 11 

Yes 10 

8 

Use special connector to supply 12 V voltages from 
battery to injector and check if injector works 
normally. 

No Next 

Yes Next 

9 

Re-check if injector can inject fuel after cleaning. 

No Replace 

injector 

Yes Replace 

fuel 

10  Check if fuel is deterirate or containing water 

No 16 

Yes Next 

11  Check if fuel pressure below 250kPa. 

 

No 15 

 

53

 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

Yes Next 

12  Shut off fuel gauge valve. Connect ignition key 

again to run fuel pump for 3 seconds. Check if fuel 
pressure can be set up. 

No 14 

Yes Replace 

pressure 

regulator 

13  Open fuel gauge valve, use return fuel blocker to 

clamp fuel pipe for no returning fuel. Check if fuel 
pressure can be set up soon。 

No 

Repair and replace 
injector or fuel pipe

Yes 

Repair or replace 
fuel inlet 

14  

Check if fuel pipe is leaked or blocked. 
 

No 

Replace fuel pump 

Yes 

Repair or replace 
returning fuel pipe 

15  

Check returning fuel pipe is blocked or bend 

No Replace 

pressure 

regulator 

Yes Next 

16  Check if the date of MAP or IAT is normal。 

No Replace 

sensor 

Yes Next 

17 

 

Check if ignition coil, distributor, high voltage wire 
and spark plug are normal   

No 

Replace or adjust 

Yes 

Check A/C system 

18  Check if A/C system is malfunction. 

No Replace 

ECU 

 
15）A/C system malfunction 

Yes Next 

1 

Check if there is full coolant and check if A/C belt, 
A/C clutch, pressure switch are narmal 

No Eliminate 

malfunction 

Yes Eliminate 

malfunction 

2 

Turn on A/C switch at engine idle. Check if A/C 
thermistor is malfunction 

No Next 

Yes Next 

3 

Turn on A/C switch. Connect adaptor between 
ECU and harness. Check if output signal for ECU 
pin 40 and 41(A/C switch) 

No Check 

harness 

 

Yes 

Replace bulb or 
repair harness 

4 

If the vehicle is low-level controlled, Check if A/C 
can work when turn off A/C. 

No Next 

Yes 

Repair A/C relay 
and harness 

5 

Check if output low-level is on ECU pin 
22(connect earthing terminal of A/C relay pull-in     
coil) 

No Replace 

ECU 

 
 
8. Precaution for service   
1)  Precaution for service EFI 

(1)  Controler removal request   

 

54

 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

Remove controller before welding or painting; 
Turn off ignition switch when removing controller to void gamage; 
Don’t remove power wires from battery when engine running or electric appliance is in 
using; 
Don’t start engine with high current; 
Note that the ambient temperature of controller could not exceed 80Cº 
(2)  Clean request: Please observe following regulations: 
Put removed parts on clean place and cover them with suitable cloth. 
Only allowed to pull out ot insert each harness or tester harness after ignition switch turns 
off. 
Make sure the correction for connecting wires when measuring voltage or ground for 
electronic control system; 
Removing power wires from battery or pulling out controller connector will cause losing 
the information for diagnosis and self-study stored in memory. 
(3)  Precaution for fuel system service 
When removing or installing fuel pump in fully or partial fully fuel tank, pay close 
attention to: 
Mounting equipment that could absorb leaked fuel on tank outlet before operation; 
Avoid skin touch with fuel directly; 
Cover or block out the opened parts if not be used at once; 
Take out parts only before installing. Don’t use the parts witout pakage; 
Don’t damage o-ring during installing injector. Smear a little lubricant on o-ring for 
beteer fitting; 
Don’t use compressed air or move vehicle when opening system. 

 
2) Safety precaution 
  In order to avoid personal hurt or damage injector and ignition unit, pay close attentionto: 

(1)  Don’t touch otr pull out ignition harness if engine is running or starting; 
(2)  Pull bout harness connector if engine is started by starter motor (for example in the 

situation of checking compressed air).   

 

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Chery  QQ  Maintenance Manual         465 Engine Mechanical System

            

         

 

 

CONTENTS 

 

CHAPTER  1…………………………………………………2 

CHAPTER  2…………………………………………………5 

CHAPTER  3…………………………………………………21 

CHAPTER  4…………………………………………………31 

CHAPTER  5…………………………………………………34 

CHAPTER  6…………………………………………………35 

CHAPTER  7…………………………………………………37 

CHAPTER  8…………………………………………………39 

CHAPTER  9…………………………………………………41 

CHAPTER  10……………………………………………… 43 

CHAPTER  11……………………………………………… 45 

CHAPTER  12……………………………………………… 46 

CHAPTER  13……………………………………………… 49 

CHAPTER  14……………………………………………… 50 

CHAPTER   15………………………………………………51 

CHAPTER   16………………………………………………52 

 
 
 
 
 
 
 
 

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