Chery S11 / Chery QQ. Manual - part 227

 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

 

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Oxygen sensor 

 

The diagram of oxygen sensor 

Oxygen sensor connects with cable. The 
other end of 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 

             

    Feature curve of oxygen sensor at 600 C

　

 

 

 
6、ECU 
Usage: ECU is central part of electronic 
control system. Sensors supply every signal 
for ECU. After calculation, 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 fixed under instrument panel 
by screws. Note to insert pins vertically 
during installation, otherwise it will cause 
terminals getting out to influence the normal 
operation of engine. 
 
 
 
 
 
 
 
 
 
 
 

Output 

 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 
Out view and internal construction of ECU 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 
 
 
 
 

 

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 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

 

Pins on ECU 

Power: The battery supplies voltage to ECU through pin 18. When main relay is on, battery 
supplies voltage through pin 37 and when ignition switch is on, battery supplies voltage 
through pin 27. 
Attention: Pin 8 and pin 52 are used for making richer fuel/air mix during after-sale service. 
They are mainly used on bad engine starting condition because of aging parts or bad part. 

 

pin 

Method 1 

Method 2

Method 3

Method 4

Not used 

Ground 

Not used 

Ground 

Not used 

Not used

Ground 

Ground 

degree 

Normal  

Thick  

Thicker  

Thickest  

Control method for pin 8 and pin 52 

7. Fuel pump 
Usage: Fuel pump feeds fuel with certain pressure and quantity to engine.   
Constitute and principle: The pump consists of DC motor, vane motor and cover (together 
with stop return valve, leak valve and anti-electromagnetic interference elements). The pump 
and motor are mounted on same shaft and sealed in same shell. Pump and motor in shell are 
surrounded by fuel for radiation and lubrication. 
Battery supplies voltage to pump through 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 decided by leak valve that is 
between 450kPa and 650 kPa. But the pressure in whole fuel system fluctuates with the 
fluctuating of intake manifold pressure. Fuel regulator decides the differential (usually is 
300kPa ) between system pressure and manifold pressure. 
Note: The temperature of fuel has great influence 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 carefully whether the high 
temperature working function is good. 
 
 
 

 

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 Chery  QQ  Maintenance Manual                   465 EFI System

 

 

 
 

 

Fuel pump 

 
 

 

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 field 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. 
In order 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. 
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   

 

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