Chery S11 / Chery QQ. Manual - part 210

 Chery  QQ  Maintenance Manual                     372 EFI System

 

be carried out: 
(1)  Make any abnormal situation for ECU and MIL (except vehicle without MIL). 
(2)  Use diagnoses instrument or flashlight to check to insure no any malfunction information 

records. 

(3)  Use diagnoses instrument to check the idle data on heated engine of EFI system to insure 

everything is OK. 

(4)  Make sure the sysptoms that driver told exisist and check the exact position of sysptom. 

Then begin appearance check: 

Check if clear or substance on harness ground. 
Check if any break, tweast in vaccum pipe or if connect correctly. 
Check if any block in vaccum pipe. 
Check if any stave or damage on intake air pipe. 
Check if the seal between throttle body and manifold is good. 
Check if any break, aging on high voltage line in ignition system or connect correctly. 
Check if the connection of wires is correct or any loose/bad contact on connector. 
1）    Engine does not run or run slowly on startin 

No. 

Operation steps 

Test step 

Next step 

Yes Next 

1 

Check if the voltage between two poles on 
battery is 10—12.5 V. 

No 

Repair or replace battery

Yes Next 

2 

Turn on ignition key. Check if the voltage 
on positive poles of battery connected with 
the key is 10—12.5 V. 

No 

Repair poles or replace 
wires 

Yes Next 

3 

  Keep ignition key on start position. Check 
if the voltage on positive pole of stater 
connected with ignition key is 8V. 
 

No 

Replace bulb, replace 
actuator, repair or 
replace ignition key 

Yes Next 

4 

Keep ignition key on start position. Check 
if the voltage on positive pole of stater is 
8V. 
 

No 

Repair poles or replace 
wires 

Yes 

Repair or replace start 
motor 

5 

Use multimeter to check if open or short 
for starter. 

No Next 

Yes Trouble 

shooting 

6 

Check if engine blocks for bad lubrication. 
 

No Next 

Yes 

Replace suitable oil 

7 

If in winter, check if the resistance of 
starter is too big that resulted by wrong 
lubricant or gear oil. 

No 

Repair or replace timing 
belt 

 
2）Engine can run but cannot start successfully (with distributor) 

No. 

Operation steps 

Check step

Next step 

 

 

 Chery  QQ  Maintenance Manual                     372 EFI System

 

Yes Eliminate 

trouble 

1 

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

No Next 

Yes 8 

2 

Pull out cylinder wire and connect ignition plug 
with the electrode 5—10mm from engine body. 
Run engine with starter and check if high 
voltage ignition in blue and white appears. 

No Next 

Yes  

Next 

3 

Check if the resistance of high voltage wire is 
normal (about 16k/ m. For exact data, please 
touch manufacture). 

No Repair 

or 

replace high 
voltage wire 

Yes Replace 

4 

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

No Next 

Yes Replace 

5 

Check if any loose or damage for identification 
ring in distributor. 

No Next 

Yes Next 

6 

Check if ignition coil is normal. 
 

No Replace 

Yes Next 

7 

  Check if distributor and high voltage coil 
inserter is good. 

No Connect 

plug 

Yes Next 

8 

Turn on ignition key. Check if fuel pump relay 
and fuel pump can work for 3 seconds.   

No Repair 

fuel 

pump circuit 

Yes Next 

9 

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 13 

Yes 12 

10  Pull out fuel distribution pipe together with 

injector. Pull out injector connector on harness. 
Supply 12V voltage directly from battery to 
injector. Check if injector can inject fuel. 

No Next 

Yes Next 

11  Re-check if injector can inject fuel after 

cleaning. 

No Replace 

injector

Yes 

Replace fuel oil

12  Check If fuel deteroprate or containing water. 

No 18 

Yes Next 

13  Check if fuel pressure below 300kPa. 

No 17 

 
 
 
 

14  Shut off fuel gauge valve. Connnect ignition key 

again to run fuel pump for 3 seconds Check if

Yes Next 

 

 

 Chery  QQ  Maintenance Manual                     372 EFI System

 

 

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

No 16 

Yes 

Repair or replace 
fuel inlet 

15  Check if fuel pipe is leaked or blocked. 

 

No  

Replace fuel 
pump 

Yes 

Repair or replace 
oil return pipe 

16  Check returning fuel pipe is blocked or bend. 

No  

Replace fuel 
pressure 
regulator 

Yes    Next 

17    Connect adaptor between ECU and harness. 

Check if voltage exisit on pin 1,2. Check if the 
positive source on above pins and ground wires 
of pin 22,44,63 on ECU are normal. 

No   

Repair or replace 
harness 

Yes  

Repair 

18  Check if intake air system parts are leakage. 

No  

Next 

Yes 

Repair or replace

19  Check if MAP or IAT are blocked. 

No Next 

Yes Next 

20  Check if ECT is normal. 

No   

Repair or replace

Yes Eliminate 

malfunction 

21  Check if engine cannot start because mechanical 

reason such as cylinder head spacing and 
cylinder leakage. 

No Replace 

ECU 

 
3）Heat start difficult 

No. 

Operation steps 

Test results  Next step 

Yes Eliminate 

trouble

1 

Turn onignition key. Use tester to check if 
malfunction information record exisits. 

No Next 

Yes Next 

2 

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 9 

Yes Next 

3 

Disconnect fuel pipe. Shut off ignition key. 
After 1 hour, check if pressure in fuel system 
can keep 150—200 kPa. 

No 

Repair fuel sys- 
tem leak 

Yes 

Replace fuel pre-
ssure regulator 

4 

Connect fuel pipe. Use returning fuel blocker to 
block returning fuel pipe and shut off fuel 
pressure gauge valve. Shut off ignition key. 
After 1 hour, check if pressure in fuel system 
can keep 150—200 kPa. 

No Next 

5 

Check if injector and fuel pipe leaks fuel. 

Yes 

Replace injector 
and oilpipe 

 

 

 Chery  QQ  Maintenance Manual                     372 EFI System

 

  

No 

Next 

Yes Check 

coolant 

temperature and 
circuit 

6 

Pull out water temperature sensor connector and 
run engine. Check if engine can start. 

No  

Next 

Yes Next 

7 

Connect adaptor between ECU and harness. 
Check if voltage exisit on pin 1,2. Check if the 
positive source on above pins and ground wires 
of pin 22,44,63 on ECU are normal. 

No 

Repair or replace 
harness 

Yes  

Harness 

8 

Replace fuel and heat start engine again. Check 
if engine can start. 

No  

Replace ECU 

Yes  

Next 

9 

Check if fuel pipe blocked or bend, or if fuel 
pump regulator can work normally. 

No 

Repair or replace

Yes Next 

10  Use multimeter tocheck if voltages between two 

ends of fuel pump inserter exists. 

No 

Repair or replace 
fuel pump relay 
and leading line 

Yes Next 

11  Check if fuel pump resistance is correct. 

No Replace 

fuel 

pump 

Yes Replace 

fuel 

pump 

12  

Check if fuel pump blocked. 

No Replace 

ECU 

 
4）RPM is normal but difficult in starting 

No. 

Operation steps 

Test 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 

Check if air filter is through. 

No Replace 

Yes Next 

3 

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

No Eliminate 

intake 

system leak 

4 

Step down throttle slightly and check engine can 
start easily. 

Yes 

Replace or check 
throttle valve 
and idle pass 

Yes Next 

5 

Connect fuel pressure 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 9 

6 Yes 

8