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
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