Chery QQ6 Service Manual download pdf (Page 66)

12.8 Unsteady Idle Speed during Warming up Process

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 Eliminate the

leakage failure of

air intake system

Yes Next step 4 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 Overhaul

Yes Next step 5 Before finish of warming up of engine, pull out

the joint on electronic throttle body and observe if

engine revolution will change.

No Check the electric

throttle body

Yes Next step 6 Check if the coolant temperature sensor is

working correctly.

No Replace

Yes Replace ECU 7 Let engine run at idle speed, after coolant

temperature reaches normal value, then use a

special short diagnostic tester to check if ignition

advance angle is normal.

No Check the ignition

timing mechanism

Note: Unsteady idle speed occurs seldom during warming up process, its

troubleshooting is similar to that for previous case, but validate if water temperature

sensor works normally in advance.

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Chery QQ6 Service Manual Page 66