Chery SQR 7160 sedan. Manual - part 117

 

 

P

art 1    Motorola Multi-port electric injection motor system 

FOREWARD 

Either MOT or M & M multi-port fuel injection system is installed on 

Chery sedan with following differences: 

 

EI Engine 

Transmission

Factory 

Number 

MOT 

SQR 

480EB 

MT SQR480EB*EB××××××× 

MOT 

SQR 

480EC 

AT SQR480EC*EC××××××× 

M&M 

SQR 

480ED 

MT SQR480ED*ED××××××× 

 
Note: MOT and M & M are two different systems, and understand which 

system is installed when servicing. 

 

 

 

 

 

 

 

 

 

Part  MOT multi-port electric fuel injection engine system 

 

 

SQR480EC electric fuel injection system 

I. System 

description 

Electric fuel injection system is a complete functions system and mainly consists of fuel 

system, air system and electric control system.  It also includes ignition control and 

exhaust control functions etc.   

 

Fuel system 

Fuel passes through fuel tank built-in oil pump to fuel filter, and is pressed to oil rail after 

filtering, then sprayed into cylinder via fuel injector, and then returns to fuel tank through fuel 

pressure adjuster, which can maintain constant fuel pressure. Fuel injector locates at the air 

intake port of each cylinder and spray fuel into cylinder. 

 

Air system   

Air system includes air intake system air cleaner, air pressure sensor, temperature sensor, 

throttle valve body, air intake hose and manifold, and idle adjuster valve and idle adjuster 

screw for idle adjusting. 

 

Electric Control System   

Consists of sensor, ECU and actuator, including ECU, air intake temperature and pressure 

sensor, water temperature sensor, throttle valve position sensor, oxygen sensor, electric oil 

pump, fuel injector, ignition coi land throttle valve body etc. 

 

13  Oil pressure adjuster 

14  Oxygen sensor 

15  3-way catalyst converter 

Engine coolant temperature sensor (water 

 temperature sensor) 

17    Crankshaft position RPM sensor 

18  ECU 

19  Battery 

20  Electric fuel injector 

21  Pressure switch 

22  Ignition switch 

23  A/C compressor 

 

1  Fuel Vapor Tank (carbon canister) 

Oil pump 

Fuel tank 

Engine 

Fuel rail 

Air Intake Temperature And Pressure Sensor 

Air cleaner 

Idle step motor 

Throttle position sensor 

Throttle valve body 

Spark Plug  12  Ignition coil 

 

II. Operation 

SQR480EC electric fuel injection system controls ignition, fuel injection, idle ect. upon 

engine speed signal, air intake pressure, throttle position signal, air temperature signal, 

oxygen sensor signal and coolant temperature signal.  The system utilize an advanced 

control strategy, and selected components and a complete set of strict production process, 

and is an electric fuel injection system featuring intelligence and stability, meets the strict 

technological demands of car manufacturer with the exhaust meeting the Euro II standard.   

The fuel system offers a 2.5 Bar fuel supply pressure. 

 

2.1 electric control system 

2.1.1 ECU 

Parameter

Unit Minimum 

Maximum

Operating 

voltage 

Volt 6.5 16 

Operating 

current 

Ampere 0.01 

0.1 

Operating 

temperatu

re 

Centigrade

-40 85 

Humidity

%RH 20  85 

Vibrating 

frequency

HZ … 1000 

 ECU operation ambient temperature range is -40℃---+85℃, therefore, before baking 

varnish for the automobile body, it should be removed first, and the temperature should be 

under strict control to avoid ECU being damaged. 

 

2. ECU damage has a low damage probability (damage ratio less than 1/1000 after 100000 

KM mileage) and do not suspect the ECU damage. Even ECU damage is suspected, do not 

attempt to disassemble it (replace the internal core) because a defective ECU can not be 

repaired. 

 

EI system wiring harness 

For MPI-ECU wiring harness assembly (multi-port fuel injection---ECU wiring harness), 

see illustration. 

Engine wiring harness 

See illustration. 

Water Temperature Sensor 

Sensor has 2 leads, one is signal lead (pin B10) and the other is ground lead (pin B23)   

 

Water 

Temperature 

Ohm