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)
49
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
51
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
52
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