Chery SQR 7160 sedan. Manual — part 128
Fig 14 Anti-theft ECU
Anti-theft ECU pin definition
8-pin connector
3-pin connector
1 Not
used
1
Antenna
positive
2
warning indicator
2
not used
3 +30(12V)
3
Antenna
negative
4 ground
5 Not
used
6
to ECU serial surface
7 Not
used
8
+15 (ignition switch
positive)
Warning indicator
Warning indicator on instruments panel is controlled by anti-theft ECU, indicating user
state information. Warning indicator will flicker under following conditions:
1. The key is stored;
2. 2.5 seconds after the key turned on, the warning indicator begins to flicker, indicating
system is operating but engine will not be protected until the key is stored.
5. Electronic Control Fuel Injection System Maintenance
(1) Fuel
ONLY high quality vehicle unleaded gasoline of RESEARCH RULE octane value
RON90 or above (conform to SH0041 standard, lead content〈=0.005g/L〉, otherwise, the
electronic control fuel injection system and 3 way catalyst converter will be damaged,
affecting exhaust performance.. In addition, sulfur or lead can damage heated oxygen
sensor.
(2) Start-up
The electronic control fuel injection system can provide appropriate injection fuel width
under all conditions. Therefore depressing pedal is not necessary before or after hot or cold
start.
During engine starting, if throttle is at wide open position, injected fuel will reduce a lot,
which providing a method of cleaning fuel from fuel spilling engine and need not remove
and wash spark plug.
It may take a long time to start engine during first starting (new car or after repairing fuel
system) because fuel pipe need to be charged with appropriate fuel pressure. After repairing
or refilling fuel again, turn ignition key to ON position and wait for 3 seconds, repeat
procedures for several times to recover fuel rail pressure.
3. Stall
Let engine idle for some time before stalling, which will let engine cool down gradually,
decrease heat impact strength, and do good for prolong engine operating components and 3
way catalyst converter life time.
4.Fuel circulation
Fuel pressure is up to 3.5 bar, therefore fuel inlet and return circuit must be firmly
connected and fastened with clamps.
During checking fuel circuit, starting engine after fuel rail and fuel pipe being removed is
absolutely forbidden. Otherwise fuel will flow out and may cause fire hazard. Fuel pressure
must be relieved before removing fuel system components.
Fuel pressure regulator blockage or fuel return pipe restriction will cause incorrect fuel
circuit pressure.
5.Fuel injector
If vehicle is not driven for a long time, the engine should be started for 3~5 minutes every
2~3 months to avoid fuel injector blocking. Fuel injectors shall be washed at least every one
year. Fuel injector O ring is life time component and can not be reused.
6. 3 way catalyst converter
When ignition switch is at ON position or engine is under normal operating condition,
checking firing by removing spark plug or ignition wire is absolutely prohibited. before
check firing, remove all fuel injector connectors, spark plugs and then connect spark plug to
corresponding cylinder high-tension wire ensuring spark plug thread part is reliably
grounded on cylinder body, start engine and check firing. Otherwise catalyst will be
damaged.
NOTE: If the engine has been running for a long time, the 3 way catalyst converter will be
very hot. Do remember to wear protecting glove when servicing to avoid scalding.
7. Throttle body
Adjustment to anti-stuck screw on throttle valve body by user is forbidden. This screw
position is precisely adjusted when assembled at factory. Improper adjustment may cause
high idle speed, engine stalling or idle stability, exhaust and fuel economic performance to
be affected.
8. Engine error indicator
Engine error indicator is located on front instruments panel. When serious error occurs, engine error indicator will
light. Such case must be repaired by professional person using appropriate tools immediately once occurs.
9. Miscellaneous
Electric fuel injection system frequent problems are caused by poor contact, therefore al
connecting points must be clean and have good contact. .ECU is of high quality component,
and itself seldom has problem. When checking, must use special tool and do not remove and
perform unwarranted repairing.
When ignition is on, DO NOT remove any electrical devices to avoid electric components
being damaged by inductive electromotive force generated in circuit.
6. Electric fuel injection system faults and repairing
1. Basic knowledge for electric control fuel injection system repairing
The electric control fuel injection system is a complicated system. Operational person
should have a good command of system theory, structure, repairing procedures and tester
using methods. When repairing an engine problem, which may has relation with electric
fuel injection system, determine if the problem related with electric fuel system first. If
engine fails and indicator does not light, it is generally not related with electric fuel
injection system and should be checked and repaired as a carburetion engine.
When checking and repairing, some instruments and gauges are often used. Frequently used
instruments and gauge include special scan tester, circuit test light, voltmeter-ohmmeter and
oscilloscope etc.
Main methods for checking electronic controlled components includes ohmmeter, voltmeter
method, scan tester methods etc. Ohmmeter is often used to measure electronic controlled
components resistance under all conditions. Voltmeter is often used to measure electronic
controlled components voltage under all conditions and scan tester is used to determine if an
electronic controlled component operative upon indicated value on display (such as
monitoring coolant temperature sensor, air intake temperature pressure etc.)
2. Electric control fuel injection system problem diagnostic precaution
(1) No matter engine is running or not, when ignition is on, any electrical units absolutely
CAN NOT be removed, such as any battery lead, idle control valve, fuel injector, electric
fuel pump, ignition system cable, ECU circuit, A/C circuit.
(2) When checking ignition circuit, fuel pipe and electrical circuit to be tested must be
disconnected before starting engine. Disconnecting ignition wire is absolutely forbidden
when engine is running.
(3) Ohmmeter and indicator used to check sensor and electric controller resistance
must be over than 10kΩ, otherwise sensor and ECU may be damaged.
(4) ECU is a high quality integrated circuit, the failure ratio is very low, and do not suspect
its failure.
(5) Preventing water splashing to system wiring harness and sensor which will cause short.
(6) Before welding vehicle circuit, removing battery negative terminal.
(7) Electrical arch welding operating must be far away from ECU and sensor
3. Electric control fuel system fault and repairing
(1) Engine does not start or hard to start
No Problem
causes
Actions
1.
Fuel injector fault
check if fuel injector operating condition
normal using scan tester.
2
Crankshaft speed and position sensor
fault
Using feeler gauge, check clearance
crankshaft speed and position sensor head
and signal wheel tooth top. Check sensor
circuit.
3
ECU socket fault
Check if good contact between socket and
ECU.
4
Idle speed control valvel fault
Using scan tester, check idle speed control
valve operating condition, and inspect if
connector contact is good.
5
Loosen throttle valve body mounting
screw
Tighten throttle valve body mounting
screw
(2) Insufficient engine power
No. Problem
Causes
Actions
1
Poor electric fuel pump operation
Check if all connections good. Check electric fuel
pump, replace as necessary.
2
Blocked fuel filter or pipe
Check if fuel filter and fuel pipe blocked, clean or
replace fuel pipe as necessary.
Insufficient or unstable fuel feed
pressure
Check fuel circuit and electric fuel pump.
Check if fuel injection pressure is within
specification.
Insufficient air intake
Check air intake pipe
3
Damaged fuel injector
Check fuel injector performance data and
injection hole, replace as necessary
Damaged air intake pressure
sensor
Check air intake pressure sensor performance
data, replace as necessary.
Damaged crankshaft speed and
position sensor
Check crankshaft speed and position sensor
performance data, replace as necessary/
Damaged throttle position sensor
Check throttle position sensor performance data,
replace as necessary.
3
Optimum ignition time not
reached
Replace ECU
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