Chery S11 / Chery QQ. Manual - part 237

 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

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 

Yes   Cleaning 

18  Check if sensor holes on MAP and IAT block. 

No Next 

Yes Next 

19  Run engine at idle. After coolant temperature 

reaches actuating temperature for closed loop 
control, check if oxygen sensor works normally. 

No 

Check oxygen sensor 
and harness 

Yes Eliminate 

leak 

 

20 

 

Chec if intake air system leaks. 

No Next 

Yes Next 

21  Check if cylinder pressure is normal. 

No Trouble 

shooting 

Yes Replace 

ECU 

22      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 

 
 

 

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 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

7）    Unstable idle at heat engine 

 

Yes Eliminate 

ecplicit 

malfunction 

1 

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

No Next 

Yes Next 

2 

Check if air filter is through. 

No Replace 

Yes Next 

 

3 

    Check if MAP pressure is    35—65 kPa at idle 
in heating engine process. 
 

No Eliminate 

intake 

system malfunction 

Yes Next 

4 

Shut off engine ,turn on ignition key. Connect 
adaptor between ECU and harness. Check if 
voltages on pin 44,45 ( output signal for IAT and 
ECT)and pin 12 ( for 4.5-5V power of sensor) are 
normal. 

No Check 

Yes Next 

5 

Pull out idle actuator connector before heat start 
engine and check if engine speed is normal 

No 

Replace idle actuator 

Yes Next 

6 

Check if coolant temperatuer sensor is normal 

No Replace 

Yes Replace 

ECU 

7 

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 

ignitionadvance angle 

 
8）Unstable idel after heat engine 

Yes Eliminate 

malfunction 

1 

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

No Next 

Yes Next 

2 

Turn on ignition key. Connect adaptor between 
ECU and harness. Check if voltages on pin 
7,44,45, 28(output signal for MAP, IAT,ECT and 
oxygen sensor)and pin 4,21,26,29(output to idle 
actuator)are normal 

No 

Repair or replace 
harness 
 

Yes Next 

3 

Shout off engine .Check if air filter is through   

No Replace 

Yes Next 

4 

Check if MAP pressure is    35—65 kPa at idle   

No Eliminate 

intake 

system leak 

Yes Next 

5 

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 9 

 

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 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

Yes 8 

6 

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

No Next 

Yes Replace 

7 

Re-check if injector can inject fuel after cleaning.

No Replace 

injector 

Yes Replace 

fuel 

8 

Check if fuel is deterirate or containing water 

No 14 

Yes Next 

9 

Check if fuel pressure blowe 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 or replace fuel 
inlet 

12  Check if fuel inlet is leak or block   

No 

Replace fuel pump 

Yes 

Repair or replace 
return fuel pipe 

13  Check if return fuel pipe is block or bend 

No 

Replace fuel pressure 
regulator 

Yes Next 

14  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 Replace 

coolant 

temperature sensor 

15  Pull out coolant temperature sensor and check if 

engine is normal 

No Next 

Yes Next 

16  Check if cylinder compression pressure of engine 

is normal 

No Trouble 

shooting 

Yes Next 

17  Check if the resistance of high voltage wire is 

normal (about 16k/ m. For exact data, please 
touch manufacture).。 

No Replace 

Yes   Replace 

18  Check if any ablation damage or crack on 

distributor cover and distributor 

No Next 

Yes Replace 

ECU 

19    Check if spark plug is normal 

 

No   

Replace spark plug 

 
 
 
 

 

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 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

 
9）Unstable idel or switch off on load condition(with A/C etc,.) 
 

Yes Eliminate 

malfunction 

1 

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

No Next 

Yes Next 

2 

Turn on A/C switch. Turn on ignition key. 
Connect adaptor between ECU and harness. 
Check if pin 40 and 41(A/C switch) have signal 
input 

No 

Repair A/C circuit 

Yes Next 

3 

Check if A/C system pressure, magnetic clutch of 
compressor and A/C pump are normal 

No 

Repair or replace 

Yes Next 

4 

Turn on ignition key. Check if voltage on pin 4, 
21, 26, 29 (output to idle actuator) are normal 

No 

Check control circuit 

Yes 

Repair or replace 
stepmotor 

5 

Remove stepmotor and check if stepmotor is 
jamming or does not work flexibly 

No Next 

Yes Replace 

ECU 

6 

Turn engine and open A/C. Check if idle actuator 
is normal   

No 

Replace idle actuator 

 
ECU can take not only the low-level signal but also high-level signal of its No.41 pin as 
requesting signal. No.41 pin should be high-level signal if ECU takes low-level signal of its 
No.41 pin as requesting signal, under the condition of A/C switch off. Otherwise it is true. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

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