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
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