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
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