Chery QQ6 (S21) / S12LHD. Manual — part 262
Yes
Next step
12
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
14
Yes
Replace the pressure
regulator
13
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
14
Check if there is leaking or jam in oil intake
pipe.
No
Replace oil pump
Yes
Repair or replace oil
return pipe
15
Check if the oil return pipe is bended or
jammed.
No
Replace the pressure
regulator
Yes
Next step
16
Check if leak and blocking exist in air intake
system and if air flow meter works normally.
No
Replace the sensor
Yes
Next step
17
Check if spark plug, ignition cable and ignition
coil are normal.
No
Replace or adjust
Yes
Check A/C system
18
Check if it results from air conditioning system.
No
Replace ECU
Note: Poor acceleration of system relates to many factors, such as problem in mechanical part of the
engine itself, cylinder pressure and carbon deposit on valve etc. In addition, it is also in connection with
other systems, such as power steering system and A/C system.
12.16 Unable to Reach the Maximum Revolution when Accelerating
Yes
Remove the failure
displayed
1
Put the ignition switch to “ON”. Use a failure
diagnostic tester to check if any failure
information record exists.
No
Next step
Yes
Next step
2
With engine off, check if air cleaner is smooth
(can not simply rely on visualization, remove
the air cleaner and then perform test drive again)
and if air intake system is chocked.
No
Replace
Yes
Next step
3
Run the engine at idle speed and check if the
engine revolution speed is normal at idle speed.
No
Repair in accordance
with
idle
speed
failure item
Yes
Next step
4
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
Overhaul
Yes
Next step
5
Put the ignition switch to “ON”. Check if it is
break or short circuit between 38#, 32#, 54#,
36# pins on ECU connector and 1#, 2#, 4#, 6#
pins of throttle position sensor of electronic
throttle valve body.
No
Repair or replace
Harness
Yes
Next step
6
Let engine run at idle speed, after coolant
temperature reaches normal value, then use a
diagnostic tester to check if ignition advance
angle is normal.
No
Check other part
Yes
Next step
7
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
11
Yes
Next step
8
Check if working positions of camshaft position
sensor and crankshaft position sensor are
normal.
No
Replace
the
parts
involved
Yes
Next step
9
Clean out the fuel injector and look if it can
work correctly.
No
Replace fuel injector
Yes
Replace fuel
10
Check if fuel is deteroprated or moisture.
No
16
Yes
Next step
11
Check if the fuel pressure value is below 300
kPa.
No
15
12
Yes
Replace or clean
Check if the exhaust system and three-way
catalytic converter are jammed.
No
Replace ECU
Note: In case the engine is unable to reach its maximum revolution when accelerating, mainly check if
exhaust pipe is chocked and air cleaner is smudgy. In addition, for electric control system of A21, in case
of a failure in crankshaft or camshaft position sensor, ECU will take restrictive driving measures to
restrict engine revolution to exceed certain value, which should be noted during maintenance process.
12.17 When Releasing Accelerator Pedal after Acceleration, Unsteady Idle
Speed Occurs at Instant, even Extinguishes.
Yes
Remove the failure
displayed
1
Put the ignition switch to “ON”. Use a failure
diagnostic tester to check if any failure
information record exists.
No
Next step
Yes
Next step
2
With engine off, check if air cleaner is smooth
(can not simply rely on visualization, remove
the air cleaner and then perform test drive again)
and if air intake system is chocked.
No
Replace
Yes
Next step
3
Run the engine at idle speed and check if the
engine revolution speed is normal at idle speed.
No
Repair in accordance
with
idle
speed
failure item
Yes
Next step
4
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
Overhaul
Yes
Next step
5
Put the ignition switch to “ON”. Check if it is
break or short circuit between 38#, 32#, 54#,
36# pins on ECU connector and 1#, 2#, 4#, 6#
pins of throttle position sensor of electronic
throttle valve body.
No
Repair or replace
Harness
Yes
Next step
6
Let engine run at idle speed, after coolant
temperature reaches normal value, then use a
diagnostic tester to check if ignition advance
angle is normal.
No
Check other part
Yes
Next step
7
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
11
Yes
Clear carbon deposit
8
Remove air intake hose, check if carbon deposit
or other soil (this may result in air intake system
of engine being chocked when the valve plate
closes) exists.
No
Next step
Yes
Next step
9
Clean out the fuel injector and look if it can
work correctly.
No
Replace fuel injector
Yes
Replace fuel
10
Check if fuel is deteroprated or moisture.
No
16
11
Yes
Next step
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