Chery A11. Manual — part 111
2.3.3.2 air intake manifold lower body
2.4 fuel vapor control system
In order that air could be exchanged for fuel tank, and to prevent fuel vapor from exhausting
to atmosphere, fuel vapor is absorbed by active carbon and stored in it. Upon engine
operating condition, stored fuel vapor will be timely and adequately sent to air intake hose
and burned with mixture in combustion chamber.
SQR480EC multi-port fuel injection system using and servicing
3.1 fuel and purge system using and servicing
3.1.1 Fuel grade used in Chery engine must be higher than 93#RON, and leaded gasoline or
fuel grade lower than 93#RON CAN NOT be used. Leaded oil could do harm to the
3-way catalyst, resulting in the loss of oxidization and reduction function to harmful
materials in exhaust. Lower grade gas will cause fuel injector being blocked, pin valve and
regulator etc. being damaged, shortening components lifetime. Using leaded gasoline will
cause a damaged 3-way catalyst converter, after which 3-way catalyst converter function
will not recover even the right gas is used. If leaded fuel is added, the vehicle should be
driven to specified repairing workshop and repaired as soon as possible.
★ 3-way catalyst converter lose its function under following conditions, which should be
avoided.
Burned under high temperature. The ideal temperature for a high purge ratio and long life
time is s 400-800℃. A higher temperature will cause overheat catalyst, fast ageing, losing
catalyst function;
Catalyst hole blocked;
(3) Under an over 800℃ temperature and last for 30 seconds, remaining gas in catalyst
will cause 3-way catalyst converter being damaged. Therefore when engine operating,
removing ignition coil wire for an operational engine is absolutely forbidden.
3.1.3 Poor engine operation may cause 3 way catalyst converter being damaged. Therefore,
scheduled technique service must be done as per Servicing Manual.
3.1.4 Before engine stalls, let engine idle for some time and cool down gradually, lower heat
impact strength which will do good to a prolonged engine components and 3 way catalyst
converter life time.
3.1.5 After a long-time driving, the vehicle CAN NOT be immediately parked in a place
where the 3-way catalyst may reaches flammable materials to avoid accidents caused by
high temperature 3 way catalyst converter.
3.1.6 DO NOT depress throttle pedal when starting. ECU determines engine operating
conditions upon throttle position. Once throttle pedal is depressed, throttle is opened and
ECU cannot determine if engine is under operating condition and can not supply fuel
correctoly.
Water temperature sensor
Beside is
elbow of water
3.1.7 After cool starting, the engine is in fast idle. With water temperature increasing,
engine speed decrease. After engine warming up (water temperature above 85 ℃), engine
speed stabilize at 950±50r/min.
3.1.8 Wrap pipe connector with plastic cloth when servicing fuel pipe, preventing fuel
splash. DO NOT smoke or fire to avoid fire hazard.
3.1.9 DO NOT remove injector to check fuel injecting condition. DO NOT spray to sky to
avoid explosion and combustion from spark.
3.1.10 Check whole fuel pipe circuit leakage frequently and fuel leakage problem should be
immediately repaired..
3.1.11 Set screw for controlling throttle idle position on throttle valve has been precisely
adjusted and any adjustment is forbidden.
3.2 Electrical system using and servicing
3.2.1 Stop vehicle and turn ignition off after stopping.
3.2.2 Lead on battery MUST BE removed before removing electrical connector.
3.2.3 Voltage supplied to engine is battery voltage and to avoid ECU damaging for over
voltage, any other external voltage supply such as fast-charging, starter voltage stabilizing
power CAN NOT be used to start engine.
3.2.4 ECU, sensor and actuator elements must be protected from humidity, static electricity,
and strong electronic interference (wiring harness must be at least 50 cm away from
high-tense wire),. Avoid equipments falling and dropping when servicing..
3.2.5 Do not start engine when loose connection or battery leads exist.
3.2.6 Disconnecting battery from vehicle circuit is absolutely forbidden when engine is
under normal operating condition; otherwise a permanent ECU damage will be caused.
3.2.7 Disconnecting battery from all vehicle circuits when fast-charging battery.
3.2.8 DO NOT remove and connect harness connectors on ECU when ignition key is at ON
position avoiding ECU being damaged by over voltage.
3.2.9 SQR480EC engine utilize high impedance spark and wire, which are special parts for
such engine, and can not be replaced with common high-tension wire, otherwise ECU will
be damaged and affect system normal operating.
III. SQR480EC EI system faults and trouble shooting
4.1 CAN NOT START ENGINE
Power check
1 battery
2 fuse
Check ignition system
problem
1 ECU voltage
check
2 Check ignition
switch
3 check starter relay
4 check starter
5check connecting
harness
Repair or replace defective
components
Check ignition
system falut
Check
1 ignition wire
2 ignition coil
3 spark
check fuel pipe
pressure and fuel
injector
★ ECU power wire diagnostic
Measure ECU voltage with a digital voltmeter, Pin A16 is positive and pin B16 is negative.
When ignition is turned on, this pin voltage is 12V. If the voltage is not 12V, check ECU
fuse and related circuit.
★ Power and ground fault diagnostic
Computer ground lead is generally connected to battery negative lead.
1 fuel pressure
regulator
2 fuel pump
3 fuel filter
4 fuel injector
5 fuel pipe
leakage
4.2 Hard to start
Check fault
codes
Determine fault source upon fault
codes
Check if air intake system
vacuum leakage or intake
valve dirt
1 Hose connection
2 throttle valve body air intake
valve
3 PCV hose
check if ignition system fault
1 wire
2 ignition coil
3 spark
1 Remove fuel injector
connector on each cylinder
2 keep the spark plug about 8mm
away from cylinder body. Start
motor and watch firing. A strong
fire should be visible
Watching firing of each cylinder and check spark and spark plug gap
Spark plug gap: 1mm
Note: If necessary, measure compression pressure and air valve gap
1 fuel injector leakage or short
2 fuel injector wire short
3 over fuel injection
Check fuel supply:
1 if fuel tank is empty
2 fuel supply pipe fuel pressure. When ignition key is
turned to ON position, the pump should operate 1~2
seconds.
Listening pump operating sound in fuel tank;
Feeling pressure in fuel return pipe.
1 fuel circuit leakage or
deformation
2 fuse
3 pump relay
4 fuel pump
5 fuel pump filter
6 fuel pressure
regulator
7 fuel injector
Check idle step motor
1 idle motor mount screw
2 when ignition is turned on, short
vibration should be felt.
1 replace or turn mount
screw
2 step motor connection
3 step motor
Check circuit
Using voltmeter or
oscilloscope
1circuit
connection
2 ECU voltage
Fusible link
Fuse
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