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Chery QQ6 Service Manual Page 77

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12.15 Poor Performance and Disability when Accelerating.
Yes Repair 1 Check if failure occurs, such as clutch slipping,
low tire pressure, brake delay, wrong tire size
and incorrect four-wheel alignment.
No Next step
Yes Next step 2 Check if the electronic throttle can be full
opening.
No Repair or replace the
throttle
Yes Remove the failure
displayed
3 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 4 Let engine run at idle speed, after coolant
temperature reaches normal value, then use a
diagnostic tester to check the ignition advance
angle.
No Check the parts
involved
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. 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
Harness
Yes Next step 6 Run the engine at idle speed and check if the air
intake pressure is from 35 to 65kPa.
No
Overhaul
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 10 8 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 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
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