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Chery QQ6 Service Manual Page 70

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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
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