Chery QQ6 (S21) / S12LHD. Manual — part 212
Clean out the fuel injector and observe if it can
work correctly.
No
Replace the fuel
injector
Yes
Replace fuel
12
Check if fuel is bad or moisture.
No
18
Yes
Next step
13
Check if the fuel pressure value is below 400
kPa.
No
17
Yes
Next step
14
Close the fuel manometer valve. Re-engage the
ignition switch to let the fuel pump run for a
period of time, and then check if fuel pressure
can be built up.
No
16
Yes
Check other part
15
Open the valve of fuel gauge and clamp the oil
return pipe by oil return baffle so that the oil can
not return. Check if the oil pressure occurs
immediately.
No
Repair or replace
the fuel pump
Yes
Repair or replace
oil intake pipe
16
Check if there is leakage or jam in oil intake
pipe.
No
Replace oil pump
Yes
Repair or replace
oil return pipe
17
Check if the oil return pipe is bended or
jammed.
No
Replace
fuel
pressure regulator
Yes
Repair or replace
the harness
18
Check if it is break or short circuit between 1#,
2# pins of crankshaft position sensor and 34#,
15# pins of ECU.
No
Next step
Yes
Repair
19
Check if the part of air intake system is leaking.
No
Next step
Yes
Repair or replace
20
Check if air flow meter works normally.
No
Next step
Yes
Next step
21
Check if the coolant temperature sensor is
working correctly.
No
Repair or replace
Yes
Remove
the
mechanical failure
22
Check if the reason for the failure on starting is
about mechanism, such as much cylinder
clearance, cylinder leaking, and so on.
No
Replace ECU
Note: When checking this problem, if all parts in electronic fuel injection system are
normal, consider if mechanical part of the engine works normally, or if cylinder
pressure is normal and if air leakage exists and so forth.
12.4 Warm Starting Difficulty
No.
Operating steps
Result
Follow up steps
Yes
Remove the failure
displayed
1
Put the ignition switch to “ON”. Use a special
diagnostic tester to check if any failure
information record exists.
No
Next step
Yes
Next step
2
Connect fuel manometer valve. Short 30# and 87#
pins of fuel pump relay to make the fuel pump
run, and then check if fuel pressure is around
400kPa.
No
9
Yes
Next step
3
Disconnect the connecting oil pipe and turn off the
ignition switch. Observe the voltage of fuel system
and look if it is around 300 kPa after an hour.
No
Repair
the
fuel
system
to
avoid
leakage
Yes
Replace
fuel
pressure regulator
4
Put the connecting oil pipe through, use fuel tube
clamp to intercept the oil return pipe, meanwhile,
close the fuel manometer valve. Turn off the
ignition switch, after one hour, observe if pressure
of fuel system still can maintain at around 400kPa.
No
Next step
Yes
Replace the injector
and fuel pipe
5
Check if there is fuel leakage of fuel injector and
oil pipe.
No
Next step
Yes
Check
coolant
temperature
and
circuit
6
Pull out water temperature sensor joint and start
the engine. Observe if the engine can start with
success.
No
Next step
Yes
Next step
7
Connect an adaptor between ECU and harness,
check if a voltage around 5V is present on 39#,
17# pins, meanwhile, check if the resistance value
of water temperature sensor is within normal
scope.
No
Repair or replace
the harness
Yes
End
8
Replace ECU and perform warm start again;
observe if the engine can be started successfully.
No
Replace ECU
Yes
Next step
9
Check if there is jam or bending of fuel pipe and if
the pressure regulator valve of oil pump is
working correctly.
No
Repair or replace
Yes
Next step
10
Check if there is battery voltage between the plugs
of oil pump with multimeter.
No
Repair or replace
fuel pump relay and
wires
Yes
Next step
11
Try to replace the fuel pump and see if the system
can return to normal.
No
Replace fuel pump
Yes
Replace fuel pump
12
Check if the fuel pump is stopped up.
No
Replace ECU
Note: Warm starting difficulty is in connection with many systems, such as battery,
throttle body and water temperature sensor etc. as well as mechanical part of the engine,
such as valve sealing. Thermal expansion of engine under warm state may lead to rise of
engine resistance.
12.5 Engine Speed is Normal, but it is Difficult to Start at any Time
No.
Operating steps
Result
Follow up steps
Yes
Remove the failure
displayed
1
Put the ignition switch to “ON”. Use a special
diagnostic tester to check if any failure
information record exists.
No
Next step
Yes
Next step
2
Check the air cleaner and look if it is open.
No
Replace
Yes
Next step
3
After starting successfully, check if air intake
consumption of the engine at idle speed is
around 300Kg/h (remember to check if cylinder
pressure is normal).
No
Eliminate
the
failure of air intake
system leaking
4
Step on the throttle slightly and observe if it is
easy to be started easily.
Yes
Replace
the
electronic
throttle
body
Yes
Next step
5
Connect fuel manometer valve. Short 30#, 87#
pins of fuel pump relay to make the fuel pump
run, and then check if fuel pressure is around
400kPa.
No
9
Yes
8
6
Use a special joint to directly supply a 12V
voltage and intermittent ground wire from
battery to injector and check if the injector
works normally (work intermittently).
No
Next step
Yes
Next step
7
Clean out the fuel injector and look if it can
work correctly.
No
Replace
fuel
injector
Yes
Replace fuel
8
Replace fuel 8, and check if the fuel is
deteriorated or moisture.
No
14
Yes
Next step
9
Check if the fuel pressure value is below 300
kPa.
No
13
Yes
Next step
10
Close the fuel manometer valve. Re-engage the
ignition switch to let the fuel pump run for 3s,
and then check if fuel pressure can be built up.
No
12
Yes
Replace
fuel
pressure regulator
11
Open the valve of fuel gauge and clamp the oil
return pipe by oil return baffle so that the oil can
not return. Check if the oil pressure occurs
immediately.
No
Repair and replace
fuel injector and oil
pipe
Yes
Repair or replace
oil intake pipe
12
Check if there is leaking or jam in oil intake
pipe.
No
Replace oil pump
13
Check if the oil return pipe is bended or
jammed.
Yes
Repair or replace
oil return pipe
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