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
45
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
46
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
47
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.
48
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