Chery S11 / Chery QQ. Manual — part 236
Chery QQ Maintenance Manual 465 EFI System
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 at 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
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
Yes 8
6
Use special connector to supply 12 V voltage
from battery to injector and check if injector
works normally.
No Next
Yes Next
7
Re-check if injector can inject fuel after cleaning.
No
Replace injector
Yes Replace
fuel
8
Replace fuel. Check If fuel deteriorates or
contains water.
No 14
Yes Next
9
Check if fuel pressure below 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 and replace
fuel pipe
12 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
Replace fuel pump
Yes
Repair or replace
returning fuel pipe
13
Check returning fuel pipe is blocked or bend.
No
Replace fuel
prassure regulator
Yes Next
14 Pull out idle actuator connector before coolant
temperature reaches 35 C
and check if engine
speed is dropping.
No
Repair or replace
idle actuator
15 Yes
Next
41
Chery QQ Maintenance Manual 465 EFI System
Turn on ignition key. Check voltages on
following pins are normal: 12 V for pin 27 and
zreo for pin 14 and 19.
No
Check harness or
connector
Yes Next
16 Run engine at idle. When coolant temperature
reaches normal, ground pin 51 and check if
ignition advance angle is 6.75
crank angle.
No Adjust
ignition
advance angle
Yes Next
17 Check if cylinder compressed pressure is normal.
No Trouble
shooting
Yes
Repair or replace
18
Check if MAP and IAT blocks.
No Next
Yes Replace
ECU
19 Check if coolant temperature sensor is normal.
No
Repair or replace
5）Cold start difficult
No. Operation
steps Check
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
Use multimeter to check if coolant temperature
sensor is normal. Or link 1.5k resistors between
pin 45 and pin 30 on ECU to relace coolant
temperature sensor for starting engine. If engine
can start, coolant temperature sensor is normal.
No Replace sensor
Yes Next
3
Turn on ignition key. Check if voltages on
following pins are normal: 12 V for pin 27 and
zreo for pin 14 and 19.
No
Check harness and
connector
Yes Next
4
Check if air filter is through.
No Replace
Yes Next
5
Check if MAP pressure is 35—65 kPa at idle
after start.
No Eliminate
intake
system malfunction
Yes
Check throttle and
idle pass
6
Step down throttle slightly and check engine can
start easily.
No Next
Yes Next
7
Pull out idle actuator connector before coolant
temperature reaches 35 C
and check if engine
speed is dropping.
No
Repair or replace idle
actuator
8
Connect fuel pressure gauge valve. Ground pin
86 on fuel pump relay Turn on ignition key to
Yes Next
42
Chery QQ Maintenance Manual 465 EFI System
86 on fuel pump relay. Turn on ignition key to
run fuel pump relay anfd fuel pump to check if
fuel pressure is 250—300kPa.
No 12
Yes 11
9
Use special connector to supply 12 V voltages
from battery to injector and check if injector
works normally.
No Next
Yes Next
10 Re-check if injector can inject fuel after cleaning.
No Replace
injector
Yes Replace
fuel
11 Check if fuel deteriorate or containing water.
No 17
Yes Next
12
Check if fuel pressure below 250kPa.
No 16
Yes Next
13 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 15
Yes
Replace fuel pressure
regulator
14 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 or replace
injector and fuel pipe
Yes
Repair or replace
intake fuel pipe
15 Check if fuel pipe is leaked or blocked.
No
Replace fuel pump
Yes
Repair or replace
returning fuel pipe
16 Check returning fuel pipe is blocked or bend.
No
Replace fuel pressure
regulator
Yes Next
17 Check if cylinder compressed pressure is normal.
No Troble
shooting
Yes Repair
18
Check if intake air system is leak.
No Next
Yes
Repair or replace
19 Check if MAP and IAT blocks.
No Replace
ECU
43
Chery QQ Maintenance Manual 465 EFI System
6）Unstable idle at any situation
Yes Eliminate
malfunction
1
Turn on ignition key. Use diagnostic equipment
to check if malfunction information record exists.
No Next
Yes
Repair or replace idle
actuator
2
Check if EWD3 idle actuator or step motor
actuator blocked.
No Next
Yes
Check harness and
connector
3
Turn on ignition key. Connect adaptor between
ECU and harness. Check if voltages on pin 44,45
( output signal for IAT and ECT), pin 21,29,4,26
(output signal for stepmotor) and pin 4, 26 (for
EWD3) are normal.
No Next
Yes 8
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
Check if each injector works normally.
No
Check injector and
harness
Yes Next
6
Check if the resistance of high voltage wire is
normal (about 16k/ m. For exact data, please
touch manufacture).
No Replace
Yes `Replace
7
Check if any ablation damage or crack on
distributor cove and distributor.
No Next
Yes Next
8
Check if spark plug is normal.
No
Replace spark plug
Yes Next
9
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 13
Yes 12
10 Use special connector to supply 12 V voltages
from battery to injector and check if injector
works normally.
No Next
Yes Next
11 Re-check if injector can inject fuel after cleaning.
No Replace
injector
Yes Replace
fuel
12 Replace fuel. Check If fuel deteriorates or
containing water.
No 18
Yes Next
13 Check if fuel pressure below 250kPa.
No 17
Yes Next
14 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 16
44
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