Chery B11. Manual - part 78

Chery Automobile Maintenance Manual

35

Remarks: * represents that if barometer
pressure is below 77KPa or intake air
temperature is above 50

, vacuum will

continue to leak.
Purge hole vacuum check
Check status
Coolant temperature: 80-95

1. Disassemble vacuum tube (red stripe) from

purge vacuum equipment of throttle body.
And then connect manual vacuum pump
to joint.

2. Start engine and check the vacuum degree of

purge vacuum equipment will increase
with engine speed increasing.

Remarks:

If vacuum is not changed, the purge hole
of throttle body may be jammed and it
needs cleaning.

3. Positive Crankcase Ventilation

System Check

 1. Disassemble vent tube from positive

crankcase ventilation valve (PCV valve).

 2. Disassemble crankcase ventilation valve

from rocker arm cover.

 3. Re-connect crankcase ventilation valve

and the disassembled vent tube.

  4. Start engine and let it run at idle speed.
 5. Press crankcase ventilation valve hatch

with finger. Feel it and ensure manifold
vacuum.

Remarks: The plunger of crankcase ventilation

valve will move forwards and backwards
at the moment.

  6. If you fail to feel vacuum, please clean or

replace crankcase ventilation valve.

Positive Crankcase Ventilation valve (PCV
valve) Check
1. Thin stick is inserted into PCV valve from
the position as shown in left figure (from
rocker arm cover installation side). Move thin
stick forwards and backwards to check
plunger movement status.
2. If plunger fails to move, it represents that
PCV is jammed and it needs cleaning or
replacing PCV valve.

 

 

 

 

 

rp

m

Vacuum

Rpm engine speed

PCV
valve

PCV
valve

Chery Automobile Maintenance Manual

36

3

Oxygen Sensor

Oxygen sensor is zirconia type sensor, which

may check oxygen content in emission and is of

hot-wire and 4-plug. 2 wires are hot wiring

connecting cable and the other 2 wires are sensor

signal transmission cables. The wiring layout of

oxygen sensor is as below:

Bigger difference of oxygen content exists

between emission and atmosphere, higher output

voltage of oxygen sensor is. Contrarily, the output

voltage is lower. Output voltage is about 0.45V at

theoretic air fuel ration. The output voltage varies

between 0.1V and 0.8V when feedback control

working normally.

The heat source that will increase zirconia

temperature is the exhaust heat of engine emission.

There is no voltage output if zirconia temperature is

low when engine starts. To make oxygen sensor at

operation status soon after engine starting,

hot-wiring heater is installed inside, which is

controlled by ECU to make oxygen sensor reach

working temperature in advance and at operation

status.

ECU receives voltage signal from oxygen

sensor and implement feedback control, which make

engine air fuel ration close to theoretic air fuel ratio.

Oxygen content in engine exhaust emission will be

controlled efficiently by three-way catalytic

converter, which will be purged. And at the same

time the content of NOx, CO and HC will be reduced,

which improve engine emission performance.

The purge ratio and air fuel ratio of three-way

catalytic converter is as shown in left figure.

Oxygen Sensor

Wiring diagram of oxygen sensor

Oxygen Sensor Voltage

Thick

Lean

Theoretic air

fuel ration

V

oltage 

(V)

Purge ratio and air fuel ratio of three-way

catalytic converter

Pur

ge 
rati

o

Air fuel

ration

Theoretic air fuel

ration

Air fuel

ration

Chery Automobile Maintenance Manual

37

Injector wiring layout is as below

4

Injector

Injector spray atomized fuel gas into intake

tube. The oil supply is depended on the supply time.

Injector solenoid valve consists of high resistance

and low resistance. The heating value of

high-resistance solenoid valve is low but its response

speed is low. The response speed of low-resistance

solenoid valve is high but its heating value is high,

which needs to place resistance in return circuit in

series to control maximum solenoid valve current,

preventing coil from burning-out. Currently

high-resistance solenoid valve is often applied.

Injector valve consists of pin valve and plate valve.

High-resistance and pin-valve injector is applied in

Chery Oriental Son.

To ensure if injector is ok, the injection status of

injector shall still be checked.

Injector Check

Measure resistance between terminals

(1)Disassemble injector harness connector.

(2)Measure resistance between injector terminals.

Standard Value

13-16k

(20

)

3

Mount injector harness connector.

Injector wiring layout

Injector

Chery Automobile Maintenance Manual 

           

38 

 

Chapter 5 Charging System 

I. Overview 

Charging system is a system which uses electronic power output by alternator to charge battery 

and keep constant battery under different load. 

V

o

lta

g

e

A

b

o

u

t1

4

.5

V

Time

Principle 

The rotation of excited exciting winding 

generates AC voltage. 

The AC current is rectified to DC voltage 

through diode as wave band as left figure shows. 

The average output voltage variety is small under 

alternator load. 

 

 

System Chart 

 

 

 

 

 

 

 

 

 

 

 

 

定子线圈 stator winding    励磁线圈 exciting winding    电压调节器 voltage regulator     

 

发 动 机 engine  充 电 警 告 灯 charge warning light   点 火 开 关 ignition switch  蓄 电 池 storage 

battery

 

When ignition switch is ON, current go through exciting winding, which will be initially excited. 

When stator winding begin to generate electricity after engine starting, the exciting winding is excited 

by the output current of the stator winding. 

If the exciting current increases, the alternator output power increases. If the exciting current 

decreases, the output power decreases. When battery voltage (alternator S terminal voltage) reaches 

4.4V regulation voltage, exciting current will be cut off. When battery voltage drops to regulation 

voltage, voltage regulator will adjust output voltage and keep it at invariable level by controlling 

exciting current.