Chery QQ6 (S21) / S12LHD. Manual — part 260
12.11 Periodic Unsteadiness (Have to Perform Self-study again after ECU
is Power off)
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
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
Check and repair
air intake and leak
Yes
7
4
Let engine run at idle speed, spark out cylinder in
turn, and observe if engine revolution will fall and
fluctuate (it is prohibited to carry out spark out
experiment by disconnecting ignition cable).
No
Next step
Yes
Next step
5
Turn on ignition switch, connect an adaptor
between ECU and harness, and then check if the
voltage between 17# and 42# pins of ECU,
between 39# and 17# pins of ECU (signal output
terminal of intake air temperature sensor and
coolant temperature sensor) as well as 64#, 65#,
66#, 67# pins of ECU (for control of DC motor) is
normal.
No
Repair or replace
cable
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
of the system is normal.
No
Check other part
Yes
Sweep
7
Check air intake system for such failures that may
affect working of engine as blocking and air leak
etc.
No
Next step
Yes
Replace fuel
8
Check if fuel is deteroprated or moisture.
No
Next step
Yes
Next step
9
Use a special joint to directly provide a 12V
power supply and intermittent ground wire from
battery to injector and check if the injector can
work intermittently.
No
Check and repair
oil
injector
and
related wires
Yes
Next step
10
Check if the resistance values of cylinders’
ignition cable are normal.
No
Replace
Yes
Replace
11
Check if the ignition coil is damaged or cracked.
No
Next step
Yes
Replace ECU
12
Check if the spark plug is in right conditions.
No
Replace spark plug
Note: For periodic unsteadiness, mainly check air intake system for air leak or
electronic throttle body for failure. Following are the steps for inspection of electronic
throttle body: while turning on ignition key, throttle may jiggle; during self-checking
procedure, throttle should act with actions of accelerator pedal.
12.12 Too High Idle Speed (Have to Perform Self-study again after ECU is
Power off)
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
Adjust or replace
2
Check if throttle valve plate is locked and if
failure exists in electronic throttle body.
No
Next step
Yes
Repair or replace
3
Check if the canister control valve, the fuel
pressure
regulator,
the
positive
crankcase
ventilation vacuum pipe and the vacuum pipe of
brake system are mounted steadily or they are
damaged.
No
Next step
Yes
Next step
4
Run the engine at idle speed and use neutral. Step
on the accelerator and observe if the idle speed is
too high.
No
6
Yes
Repair or replace
the vacuum booster
5
Clamp the vacuum pipe and observe if the idle
speed becomes normal.
No
Next step
Yes
Replace PVC valve
6
Replace PVC valve and clamp the positive
crankcase ventilation vacuum pipe. Observe if the
idle speed becomes normal.
No
Next step
Yes
Replace the canister
control valve
7
Clamp the canister control valve pipe and observe
if the idle speed becomes normal.
No
Next step
Yes
Repair or replace
8
Check if electronic throttle body is dumb or
locked.
No
Next step
Yes
Repair or replace
9
Check other parts of air intake pipe for leakage.
No
Next step
Yes
Next step
10
Check if the gasket of fuel injector is in good
condition.
No
Replace the gasket
Yes
Replace ECU
11
Check air intake system for air leak and air flow
meter for normal working.
No
Replace the sensor
Note: Check if the system goes through self-study, if not, the system will be under
failure mode or an uncertain state all the time, which may result in too high idle speed
of engine. The other cause is air leak in the system, if air leakage in the system is too
large and exceeds regulation and control range of ECU, idle speed fluctuation may
occur.
12.13. Engine Revolution Speed is too Low or Flameout
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
Check the air cleaner and look if it is open.
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
Next
step,
overhaul
with
reference to idle
speed
failure
entries
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
Let engine run at idle speed, after coolant
temperature reaches normal value, then use a
diagnostic tester to check if ignition advance
angle of the system is normal.
No
Check
other
systems
Yes
Next step
6
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
10
Yes
9
7
Use a special joint to directly provide a 12V
power supply and intermittent ground wire from
battery to injector and check if the injector can
work intermittently.
No
Next step
Yes
Next step
8
Clean out the fuel injector and look if it can
work correctly.
No
Replace
fuel
injector
Yes
Replace fuel
9
Check if fuel is bad or moisture.
No
15
Yes
Next step
10
Check if the fuel pressure value is below 350
kPa.
No
14
Yes
Next step
11
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
13
12
Open the valve of fuel gauge and clamp the oil
return pipe by oil return baffle so that the oil can
Yes
Replace
fuel
pressure regulator
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