Chery S11 / Chery QQ. Manual — part 239

Chery QQ Maintenance Manual 465 EFI System

Yes

Repair or replace
fuel pipe

15

Check returning fuel pipe is blocked or bend.

No Replace

pressure

regulator

Yes Replace

or

cleaning

16 Check if exhaust system and TWC is blocked

No Replace

ECU

14）Poor performance of acceteration and powerlessness

Yes Repair

1

Check if it exists malfunction as following: clutch
slipping, air pressure of tire is low, braking drag,
size of tire and four-wheeled alignment are
miscorrect

No Next

Yes Next

2

Check if throttle can full-open

No

Rpair or replace
throttle

Yes Eliminate

malfunction

3

Turn on ignition key.Use diagnostic equipment to
check if malfunction information record exists。

No Next

Yes Next

4

Run engine at idle. After coolant temperature
reaches normal, groun pin 51 on ECU and check if
ignition advance angle is 6.75 

crank angle.

No Adjust

ignition

advance angle

Yes Next

5

Turn on ignition key. Connect adaptor between
ECU and harness. Check if voltages on pin 7,53,44,
45, 28 (output signal for MAP, TPS, IAT, ECT and
oxygen sensor), 28,30(signal ground connection for
sensor) and pin 12 (for 4.5-5V power of sensor) are
normal

No

Repair or replace
harness

Yes Next

6

Check if intake pressure is 35—65 kPa at idle after
start

No Repair

Yes Next

7

Connect fuel pessure gauge valve. Short pin 30 on
fuel pump relay and pin 87 to start fuel pump.
Check if fuel pressure is 250—300 kPa

No 11

Yes 10

8

Use special connector to supply 12 V voltages from
battery to injector and check if injector works
normally.

No Next

Yes Next

9

Re-check if injector can inject fuel after cleaning.

No Replace

injector

Yes Replace

fuel

10 Check if fuel is deterirate or containing water

No 16

Yes Next

11 Check if fuel pressure below 250kPa.

No 15

53

Chery QQ Maintenance Manual 465 EFI System

Yes Next

12 Shut off fuel gauge valve. Connect ignition key

again to run fuel pump for 3 seconds. Check if fuel
pressure can be set up.

No 14

Yes Replace

pressure

regulator

13 Open fuel gauge valve, use return fuel blocker to

clamp fuel pipe for no returning fuel. Check if fuel
pressure can be set up soon。

No

Repair and replace
injector or fuel pipe

Yes

Repair or replace
fuel inlet

14

Check if fuel pipe is leaked or blocked.

No

Replace fuel pump

Yes

Repair or replace
returning fuel pipe

15

Check returning fuel pipe is blocked or bend

No Replace

pressure

regulator

Yes Next

16 Check if the date of MAP or IAT is normal。

No Replace

sensor

Yes Next

17

Check if ignition coil, distributor, high voltage wire
and spark plug are normal

No

Replace or adjust

Yes

Check A/C system

18 Check if A/C system is malfunction.

No Replace

ECU

15）A/C system malfunction

Yes Next

1

Check if there is full coolant and check if A/C belt,
A/C clutch, pressure switch are narmal

No Eliminate

malfunction

Yes Eliminate

malfunction

2

Turn on A/C switch at engine idle. Check if A/C
thermistor is malfunction

No Next

Yes Next

3

Turn on A/C switch. Connect adaptor between
ECU and harness. Check if output signal for ECU
pin 40 and 41(A/C switch)

No Check

harness

Yes

Replace bulb or
repair harness

4

If the vehicle is low-level controlled, Check if A/C
can work when turn off A/C.

No Next

Yes

Repair A/C relay
and harness

5

Check if output low-level is on ECU pin
22(connect earthing terminal of A/C relay pull-in
coil)

No Replace

ECU

8. Precaution for service
1) Precaution for service EFI

(1) Controler removal request

54

Chery QQ Maintenance Manual 465 EFI System

Remove controller before welding or painting;
Turn off ignition switch when removing controller to void gamage;
Don’t remove power wires from battery when engine running or electric appliance is in
using;
Don’t start engine with high current;
Note that the ambient temperature of controller could not exceed 80Cº
(2) Clean request: Please observe following regulations:
Put removed parts on clean place and cover them with suitable cloth.
Only allowed to pull out ot insert each harness or tester harness after ignition switch turns
off.
Make sure the correction for connecting wires when measuring voltage or ground for
electronic control system;
Removing power wires from battery or pulling out controller connector will cause losing
the information for diagnosis and self-study stored in memory.
(3) Precaution for fuel system service
When removing or installing fuel pump in fully or partial fully fuel tank, pay close
attention to:
Mounting equipment that could absorb leaked fuel on tank outlet before operation;
Avoid skin touch with fuel directly;
Cover or block out the opened parts if not be used at once;
Take out parts only before installing. Don’t use the parts witout pakage;
Don’t damage o-ring during installing injector. Smear a little lubricant on o-ring for
beteer fitting;
Don’t use compressed air or move vehicle when opening system.

2) Safety precaution
In order to avoid personal hurt or damage injector and ignition unit, pay close attentionto:

(1) Don’t touch otr pull out ignition harness if engine is running or starting;
(2) Pull bout harness connector if engine is started by starter motor (for example in the

situation of checking compressed air).

55

Chery QQ Maintenance Manual 465 Engine Mechanical System

CONTENTS

CHAPTER 1. . . . . . . . . …2

CHAPTER 2. . . . . . . . . …5

CHAPTER 3. . . . . . . . . …21

CHAPTER 4. . . . . . . . . …31

CHAPTER 5. . . . . . . . . …34

CHAPTER 6. . . . . . . . . …35

CHAPTER 7. . . . . . . . . …37

CHAPTER 8. . . . . . . . . …39

CHAPTER 9. . . . . . . . . …41

CHAPTER 10. . . . . . . . . 43

CHAPTER 11. . . . . . . . . 45

CHAPTER 12. . . . . . . . . 46

CHAPTER 13. . . . . . . . . 49

CHAPTER 14. . . . . . . . . 50

CHAPTER 15. . . . . . . . . 51

CHAPTER 16. . . . . . . . . 52

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