Chery S11 / Chery QQ. Manual - part 238

 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

10）Preiodically unstable(ECU needs self-studay again) 

Yes  

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 at idle   

No Repair 

Yes 7 

4 

Run engine at 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 7,44,45, 
28( output signal for MAP,IAT,ECT and oxygen 
sensor),19(ground),27(ignition switch)and pin 4, 
21,26, 29 (output to idle actuator)are normal 

No 

Rpair or replace 
harness 
 

Yes Next 

6 

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 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 

 
 
 
 
 
 
 
11）Idle is too high (ECU needs self –studay again) 

 

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 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

Yes Eliminate 

malfunction 

1 

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

No Next 

Yes 

Adjust or replace

2 

Check if throttle pedal bracing wire is blocked or 
too tight 
 

No Next 

Yes 

Repair or replace

3 

Check if canistor control valve, fuel pressure 
regulator, PVC vacuum pipe and vacuum 
power-assisted hose of braking system are good     

No Next 

Yes Next 

4 

Step down brake pedal and check if idle is too high 
while engine idle running and in neutral. 

No 6 

Yes 

Repair or replace 
vacuum actuator 

5 

Clamp vacuum power-assisted hose and check if 
idle is normal 

No Next 

Yes Replace 

PVC 

 

6 

Clamp PVC vacuum hose and check if idle is 
normal  

No Next 

Yes Replace 

canistor 

control valve 

7 

Clamp canistor control valve hose and check if idle 
is normal 

No Next 

Yes   

Repair or replace

8 

Check if idle actuator is not flexibly or blocked 

No   Next 

Yes 

Repair or replace

9 

Check if intake pipe have leak 

No Next 

Yes Next 

10  Check if sealing washer of injector is good 

No Replace 

sealing 

washer  

Yes Replace 

ECU 

11  Check if MAP and IAT are good   

No   Replace sensor 

 
12）Speed of engine is low or switch off while speeding up 

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 speed is narmal at idle 

No Next 

 

Yes Next 

4 

Check if intake pressure is 35—65 kPa at idle   

No Repair 

Yes Next 

5 

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 
 

 

50

 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

Yes Next 

6 

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 10 

Yes 9 

7 

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

No Next 

Yes Next 

8 

Re-check if injector can inject fuel after cleaning. 
 

No Replace 

injector 

Yes   Replace fuel 

9 

Check if fuel is deterirate or containing water 
。

 

No 15 

Yes Next 

10  Check if fuel pressure below 250kPa. 

 

No 14 

Yes Next 

11  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 13 

Yes Replace 

fuel 

pressure regulator 

12  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 Replace 

and 

repair injector or 
fuel pipe 

Yes 

Repair or replace 
fule pipe 

13  

Check if fuel pipe is leaked or blocked. 
 

No Replace 

fuel 

pump 

Yes 

Repair or replace 
returning fuel 
pipe 

14  

Check returning fuel pipe is blocked or bend. 

No Replace 

fuel 

pressure regulator

Yes Next 

15  Turn on ignition key. Connect adaptor between 

ECU and harness. Check if voltages on pin 
53(output signal for TPS), pin 30 (ground 
connection) and pin 12(for 4.5-5V power of sensor) 
are normal. 

No 

Repair or replace 
harness 
 

Yes Replace 

ECU 

16  Check if ignition coil, distrbutor, high voltage wire 

and spark plug are normal   
 

No 

Repair or replace 
relate unit 

 
 
13）Speeding up is slow 

1 

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

Yes Eliminate 

malfunction 

 

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 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

  

No  Next 

Yes Next 

2 

Shout off engine. Check if air filter is through 

No Replace 

Yes Next 

3 

Check if speed is narmal at idle 

No Reference 

trouble 

shooting of idle 
system 

Yes Next 

4 

Check if intake pressure is    35—65 kPa at idle   

No Repair 

Yes Next 

5 

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

No 

Repair or replace 
 

Yes Next 

6 

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 

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 

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 pipe 

14  

Check if fuel pipe is leaked or blocked. 
 

No Replace 

fuel 

pump 

 

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