Chery A11. Manual — part 119

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

(3) Unstable idle speed

No. Problem

Causes

Actions

Air leakage

Fasten throttle valve body mounting screw.

Failed idle control valve

Repair or replace the throttle valve body

Failed throttle position

sensor

Check throttle opening. Check if throttle position

sensor operating parameter within specification.

Check if throttle cable installed correctly.

Move throttle and check if throttle stuch.

Check throttle opening (angle is within 0~0.6 at

throttle is closed)

1

throttle

valve

body

Abnormal throttle

opening

If throttle angle is correct, check if throttle position

sensor connector contact is good.