Chery S11 / Chery QQ. Manual — part 205

Chery QQ Maintenance Manual 372 EFI System

5

Oxygen sensor

主继电器

氧传感器

The diagram of oxygen sensor

Oxygen sensor connects with cable. The other end
os cable is electric connector. There is asbestos
Cover on outside.
Pins on connector:
No.1: Connect heat source (+)/white
No.2: Connect heat source (-)/white
No.3: Connect signal (-)/gray
No.4: Connect signal (+)/black
The heat coil of sensor is controlled by ECU.
When sensor is heated to certain temperature, ECU
will cut current to the coil and stop heating.( when
open or short heating coil, ECU will find
malfunction information and MIL will on. Engine
will run under malfunction mode in some working
conditions).
6. ECU
Usage: ECU is central part of electronic control

system. Sensors supply every signal for ECU.
After caculation, ECU will control the action of


actuator such as injector and ignition coil to
control engine operation.
Constitute: There are shield shell and PC board in
ECU. Many electronic control units are interated
on the board to control EFI system.
Install: ECU is double connector type and is fixed
under instrument panel by screws. Series 372 only
use one connector with 81pins.

Chery QQ Maintenance Manual 372 EFI System

6

ECU pins:
1. Battery ground 29. CKP input 57. Not used
2. Battery ground 30. CMP ground 58. A/C apply
3. 3 Ignition coil 3 31.Water temperaturesignal 59.O2 ground
4. Ignition coil 1 32.TPS input 60. IAT ground
5. Ignition coil2 33. Not used 61. Injector of No.2 cylinder2
6. Can Bus lowCAN 34. Not used 62. Not used
7. Canbus highCAN 35. Step motor B+ 63. ECU powerECU）
8. O2 sensor 36. Step motor B - 64.High speed fan relay control output
9. Not used 37. Not used
10. KS signal 38. TPS ground 65. High Speed fan relay control output
11. Not used 39 Speed signal 66. Engine speed input signal
12. Evaporator temperature sensor input 40. Not used 67. Main relay control output
13. Evaporator temperature sensor ground 41. Not used 68. A/Crelay control output
14. Not used 42. Not used 69. Fuel pump relay output
15. Not used 43.O2 sensor 70. Trouble lamp
16. Not used 44. ECU power（+12V BAT） 71. Not used
17. Not used 45.TPS power supply（+5V）
18. Not used 46. IAT power supply（+5V）
19. Step motor A + 47. Not used 72. CKP input
20. Step motor A - 48 IAT ground 73. Water teperature sensor ground
21. Main relay power supply 49. Not used 74. Power steering pressure switch signal
22. Ignition switch power supply

50.

75. Not used

23. No.3 injection nozzle 51. Not used 76. Not used
24. No.1 injection nozzle 52 Not used 77. Diagnostic（K wire）
25. Not used 53. Not used 78. Not used
26. Canistor relay 54. KS ground 79. Not used
27. CKP ground 55. Ignition coil ground 80. Not used
28. Not used 56. IAT signal 81. Not used

Pins and out view of connector

7. Fuel pump
Usage: Fuel pump feeds fuel with certain
pressure and quantity to engine. The
temperature and voltage have great influnce
on pump.
Constitute and principle: The pump

consistsof DC motro, vane motor and
cover( together with stop return valve,
leak valve and anti-electromaganatic

interference elements). The pump and
motor are mounted on same shaft and
sealed in same shell. Pump and motor in

shell are surouned by fuel for radiation and
lubrication.

Battery supplies voltage to pump through

Chery QQ Maintenance Manual 372 EFI System

pump relay. The relay only switches on
pump circuit during engine starting and
running. When engine stops for malfunction,
pump will stop automatically. The
maximum pressure on outlet of pump is
desided by leak valve. Series 372 use
non-return fuel system and fuel pressure
regulator is mounted on pump assembly.
The regulator adjusts pump pressure to
380kPa to adapt the requirment for system
operation.

Note: The temperature of fuel has great
influnce on pump function. When working
under high temperature for a long time, the
pump pressure will drop rapidly if fuel
temperature is over certain value. If engine
cannot be heat started, please check carfully
whether the high temperature working
function is good.

Fuel pump

燃 油 泵 继 电 器

主 继 电 器

主 电 源

Main relay

Power

Fuel pump relay

The diagram of fuel pump
Pins: There are 2 pins on pump to connect
pump relay. Marks “+”and“-”are cut on
the shell of pump.

8. Injector
Usage: Injector injects atomized fuel to
engine in specified time according to
instruction of ECU.
Constitute and principle: ECU sends pulses
to injector coil to form magnetic fiel force.
When the force increased enough to
overcome the resultant force of spring
pressure, weight of needle valve and friction,
needle valve begins to lift and inject process
starts. The maximum lift height of needle
valve does not exceed 0.1mm. When inject
pulses stop, needle valve closes again by the
pressure of return spring.
Install hint: The injector must use suitable
connector.
Inorder to mounting easily, recommend to
smear non-silicon clear oil on the surface of
O-ring connected with fuel distribution pipe.
Pay attention to not pollute internal injector
and injector hole by oil.
Install injector to the seat vertically to
injector seat, then clamp injector on the seat
by clip.

Chery QQ Maintenance Manual 372 EFI System

Note: For long stopped vehicle, please
check carefully if the fuel cohered blocks
injector.

Diagnosis: S11 EFI system does not
diagnose the injector itself, but diagnoses for
injector driver. When injector driver is short
to battery voltage or overload, short to
ground or open, ECU will mark malfunction
position. Oxygen sensor close-loop control
and self-study pre-control will shut off. The
last self-study data is effective. After
troubleshooting, malfunction position
resumes.

Injector

主继电器

缸

缸

缸

喷油器组

The diagram of injector

Pins: There are 2 pins on each injector. One
of pins marked (+) on side of shell connects
pin 87 on pump relay, and another connects
pin 23,24 or 61 on ECU.

9. Step motor DLA
Function: Step motor with idle actuator
offers by-pass intake air channel. When
throttle closes, air will enter engine through
the channel. ECU can regulate the section of
chennel to adjust mass airflow and adjust
inject fuel amount. When engine works,
ECU will control step motor according to
different working conditions to change the
operation of engine.
Constitute and principle: Step motor is a
micro motor that consists of several steel
stators and one rotor. A coil is reeled on
each stator. Rotor is a perminent maganet
with a nut on the center. All stator coils is
always connected with electricity. If
changing current direction in one coil, rotor
will turn a degree. When current direction in
each stator coil is changed in suitable order,
revolutionary field is formed to run rotor in
certain direction.
Disgnosis: ECU can monitor the short or
open of two coils for step motor and lights
MIL. Engine runs at malfunction mode.
Some time use test can find the steps
changing, but engine still does not work
normally. Please check if intake air pressure
changes to confirm is the piston of step
motor works.