Chery QQ6 (S21) / S12LHD. Manual — part 217

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

Yes

Next step

12

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

14

Yes

Replace the pressure

regulator

13

Open the valve of fuel gauge and clamp the oil

return pipe by oil return baffle so that the oil can

not return. Check if the oil pressure occurs

immediately.

No

Repair and replace

fuel injector and oil

pipe

Yes

Repair or replace oil

intake pipe

14

Check if there is leaking or jam in oil intake

pipe.

No

Replace oil pump

Yes

Repair or replace oil

return pipe

15

Check if the oil return pipe is bended or

jammed.

No

Replace the pressure

regulator

Yes

Next step

16

Check if leak and blocking exist in air intake

system and if air flow meter works normally.

No

Replace the sensor

Yes

Next step

17

Check if spark plug, ignition cable and ignition

coil are normal.

No

Replace or adjust

Yes

Check A/C system

18

Check if it results from air conditioning system.

No

Replace ECU

Note: Poor acceleration of system relates to many factors, such as problem in mechanical part of the

engine itself, cylinder pressure and carbon deposit on valve etc. In addition, it is also in connection with

other systems, such as power steering system and A/C system.

12.16 Unable to Reach the Maximum Revolution when Accelerating

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

With engine off, check if air cleaner is smooth

(can not simply rely on visualization, remove

the air cleaner and then perform test drive again)

and if air intake system is chocked.

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

Repair in accordance

with

idle

speed

failure item

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

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.

No

Repair or replace

Harness

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 is normal.

No

Check other part

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

Next step

8

Check if working positions of camshaft position

sensor and crankshaft position sensor are

normal.

No

Replace

the

parts

involved

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

12

Yes

Replace or clean

Check if the exhaust system and three-way

catalytic converter are jammed.

No

Replace ECU

Note: In case the engine is unable to reach its maximum revolution when accelerating, mainly check if

exhaust pipe is chocked and air cleaner is smudgy. In addition, for electric control system of A21, in case

of a failure in crankshaft or camshaft position sensor, ECU will take restrictive driving measures to

restrict engine revolution to exceed certain value, which should be noted during maintenance process.