Chery S11 / Chery QQ. Manual - part 212

 Chery  QQ  Maintenance Manual                     372 EFI System

 

Yes  

Cleaning 

18  Check if sensor holes on MAP and IAT block. 

No Next 

Yes Next 

19  Run engine in 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 

 
7）      Unstable idle at 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 

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 31,56 ( output signal for IAT and 
ECT) is normal. 

No Check 

Yes Next 

5 

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

No Replace 

idle 

actuator 

Yes Next 

6 

Check if coolant temperatuer sensor is normal 

No Replace 

 
 
 
 
 
 
 
 
 
 
 

 

 

 Chery  QQ  Maintenance Manual                     372 EFI System

 

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 
60,56.31,43( output signal for MAP,IAT,ECT 
and oxygen sensor)and pin 19,20,35,36 (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 

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

 

 

 Chery  QQ  Maintenance Manual                     372 EFI System

 

Yes Replace 

coolant 

temperature 
sensor 

14  Pull out coolant temperature sensor and check if 

engine is normal 

No Next 

Yes Next 

15  Check if cylinder compression pressure of engine 

is normal 

No Trouble 

shooting 

Yes Next 

16  Check if the resistance of high voltage wire is 

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

No Replace 

Yes  

Replace 

17  Check if any ablation damage or crack on 

distributor cover and distributor 

No Next 

Yes Replace 

ECU 

18  Check if spark plug is normal 

 

No  

Replace spark 
plug 

 
 
9）Unstable idel or switch off 
 

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 50 and 58(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 
pin19,20,35,36(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 

 
 
 
 
 
 
 

 

 

 Chery  QQ  Maintenance Manual                     372 EFI System

 

10）Preiodicity unstable(ECU needs self-study again) 

Yes Eliminate 

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 intake pressure is    35—65 kPa in idle   

No Repair 

Yes 7 

4 

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 

Turn on ignition key.Connect adaptor between ECU 
and harness. Check if voltages on pin 
48,60,45,28( output signal for MAP,IAT,ECT and 
oxygen sensor),1,2(ground),22(ignition switch)and 
pin 19,20,35,36(output to idle actuator)are normal 
 

No 

Rpair or replace 
harness 
 

Yes Next 

6 

Run engine in idle. After coolant temperature 
reaches normal,check if ignition advance angle is 
normal 
 

No Adjust 

ignition 

advance angle   

Yes Cleaning 

7 

Check if sensor holes on MAP and IAT block. 

No Next 

Yes Replace 

fuel 

8 

Check if fuel is deterirate or containing water 
 

No Next 

Yes Next 

9 

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

No Repair 

harness 

and injector 

Yes Next 

10  Check if the resistance of high voltage wire is 

normal  

No Replace 

Yes Replace 

11  Check if any ablation damage or crack on 

distributor cover and distributor 
 

No Next 

Yes Replace 

ECU 

12  Check if spark plug is normal 

 

No Replace 

spark 

plug