Chery S11 / Chery QQ. Manual - part 211

 Chery  QQ  Maintenance Manual                     372 EFI System

 

 

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

No Next 

Yes Next 

7 

Re-check if injector can inject fuel after 
cleaning. 

No  

Replace injector 

Yes Replace 

fuel 

8 

Replace fuel. Check If fuel deteriorate or 
containing water. 

No 14 

Yes Next 

9 

Check if fuel pressure below 250kPa. 

No 13 

Yes Next 

10  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 12 

Yes Replace 

fuel 

pressure 
regulator  

11  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 and 
replace fuel pipe

12  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 Replace 

fuel 

pump 

Yes 

Repair or replace 
returning fuel 
pipe 

13  Check returning fuel pipe is blocked or bend. 

No  

Replace fuel 
prassure 
regulator 

Yes Next 

14  Pull out idle actuator connector before coolant 

temperature reaches 35 C

　

 and check if engine 

speed is dropping. 

No 

Repair or replace 
idle actuator 

Yes Next 

15  

Turn on ignition key. Check voltages on 
following pins are normal: 12 V for pin 27 and 
zreo for pin 14 and 19. 

No 

Check harness or 
connector 

Yes Next 

16  Run engine in idle. When coolant temperature 

reaches normal, ground pin 51 and check if 
ignition advance angle is 6.75 

　

 crank angle. 

No Adjust 

ignition 

advance angle 
 

Yes Next 

17  Check if cylinder compressed pressure is 

normal. 

No Trouble 

shooting

18   

Yes 

Repair or replace

 

 

 Chery  QQ  Maintenance Manual                     372 EFI System

 

 

Check if MAP and IAT blocks. 

No 

Next 

Yes Replace 

ECU 

19  Check if coolant temperature sensor is normal. 

No 

Repair or replace

 
5）Cold start difficult 

No. 

Operation steps 

Check results

 

Next step 

Yes Eliminate 

malfunction 

1 

Turn on ignition key. Use tester to check if 
malfunction information record exists. 

No Next 

Yes Next 

2 

Use multimeter to check if coolant temperature 
sensor is normal. Or link 1.5k resistors between 
pin 45 and pin 30 on ECU to relace coolant 
temperature sensor for starting engine. If 
engine can start, coolant temperature sensor is 
normal. 

No  

Replace sensor 
 

Yes Next 

 

3 

Turn on ignition key. Check if voltages on 
following pins are normal: 12 V for pin 27 and 
zreo for pin 14 and 19. 

No Check 

harness 

and connector 

Yes Next 

4  

Check if air filter is through. 

No Replace 

Yes Next 

5 

Check if MAP pressure is    35—65 kPa in idle 
after start. 
 

No Eliminate 

intake 

system 
malfunction 

Yes Check 

throttle 

and idle pass 

6 

 

Step down throttle slightly and check engine 
can start easily. 

No Next 

Yes Next 

7 

Pull out idle actuator connector before coolant 
temperature reaches 35 C

　

 and check if engine 

speed is dropping. 

No 

Repair or replace 
idle actuator 

Yes Next 

8 

Connect fuel pressure gauge valve. Ground pin 
86 on fuel pump relay. Turn on ignition key to 
run fuel pump relay anfd fuel pump to check if 
fuel pressure is 250—300kPa. 

No 12 

Yes 11 

9 

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

No Next 

Yes Next 

10  Re-check if injector can inject fuel after 

cleaning. 

No Replace 

injector 

Yes Replace 

fuel 

11  Check If fuel deteriorate or containing water. 

No 17 

 

 

 Chery  QQ  Maintenance Manual                     372 EFI System

 

Yes Next 

12  Check if fuel pressure below 250kPa. 

No 16 

Yes Next 

13  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 15 

Yes Replace 

fuel 

pressure 
regulator 

14  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 or replace 
injector and fuel 
pipe 

Yes 

Repair or replace 
intake fuel pipe 

15  Check if fuel pipe is leaked or blocked. 

No  

Replace fuel 
pump 

Yes 

Repair or replace 
returning fuel 
pipe 

16  Check returning fuel pipe is blocked or bend. 

No  

Replace fuel 
pressure 
regulator 

Yes  

Next 

17  Check if cylinder compressed pressure is 

normal. 

No Troble 

shooting 

 Yes 

Repair 

18  Check if intake air system is leak. 

No Next 

Yes 

Repair or replace

19  Check if MAP and IAT blocks. 

No Replace 

ECU 

 
6）Unstable idle at any situation 

Yes Eliminate 

malfunction 

1 

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

No  

Next 

Yes 

Repair or replace 
idle actuator 

2 

Check if EWD3 idle actuator or step motor 
actuator blocked. 

No Next 

Yes 

Check harness and 
connector 

 

3 

Turn on ignition key. Connect adaptor between 
ECU and harness. Check if voltages on pin 31,56 
( output signal for IAT and ECT), pin 19,20,35,36 
(output signal for stepmotor) and pin19, 35 (for 
EWD3) are normal. 

No Next 

 

4 Yes 

8 

 

 

 Chery  QQ  Maintenance Manual                     372 EFI System

 

 

Run engine in idle. Shut off each cylinder one by 
one and check if engine speed is dropping or 
fluctuates. 

No Next 

Yes Next 

5 

Check if each injector works normally. 
   

No Check 

injector 

and harness 

Yes Next 

6 

Check if the resistance of high voltage wire is 
normal  

No Replace 
No Replace 

7 

Check if any ablation damage or crack on 
distributor cove and distributor. 

No  

Next 

Yes Next 

8 

    Check if spark plug is normal. 

No Replace 

spark 

plug 

Yes Next 

9 

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

No 13 

Yes 12 

10  Use special connector to supply 12 V voltages 

from battery to injector and check if injector 
works normally. 

No Next 

Yes Next 

11  Re-check if injector can inject fuel after cleaning.

No Replace 

injector 

Yes Replace 

fuel 

12  Replace fuel. Check If fuel deteriorates or 

containing water. 

No 18 

Yes Next 

13  Check if fuel pressure below 300kPa. 

No 17 

Yes Next 

14  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 16 

Yes Replace 

fuel 

pressure regulator 

15      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 pipe 

16      Check if fuel pipe is leaked or blocked. 

No  

Replace fuel 
pump 

Yes 

Repair or replace 
returning fuel pipe

17  Check returning fuel pipe is blocked or bend. 

No Replace 

fuel 

pressure regulator