Chery QQ6 Service Manual download pdf (Page 64)

12.7 Unsteady Idle Speed at Any Time

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 Repair or replace

the electronic

throttle

2 Check if electronic throttle system of engine

works normally.

No Next step

Yes Check wires and

plugs

3 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 Next step

Yes 8 4 Let engine run at idle speed, spark out cylinder in

turn, and observe if engine revolution will fall and

fluctuate (cut fuel to injector).

No Next step

Yes Next step 5 Check the fuel injectors of each cylinder and look

if they are in right conditions.

No Check fuel injector

and wires

Yes Next step 6 Check if resistance value of ignition cable of each

cylinder is normal (can not exceed 16kΩ).

No Replace

Yes Maintain 7 Check if ignition system works normally.

No Next step

Yes Next step 8 Check if the spark plug is in right conditions.

No Replace spark plug

Yes Next step 9 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 13

Yes 12 10 Use a special joint to directly provide a 12V

power supply and intermittent ground wire signal

from battery to injector and check if the injector

can work intermittently.

No Next step

Yes Next step 11 Clean out the fuel injector and look if it can work

correctly.

No Replace fuel

injector

Yes Replace fuel 12 Check if fuel is deteroprated or moisture.

No 18

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Chery QQ6 Service Manual Page 64

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