Chery A series. Manual — part 116

INSTRUMENTATION SYSTEM

INTRODUCTION OF INSTRUMENTS

SYSTEM DESCRIPTION

The Chery sedan A15LHD employs indicator needles and digital combination instruments,
the combination instruments including various instruments and measuring equipments that
are used to indicate the conditions of the car, various warning lamps that are used to monitor
the abnormal conditions and notify the driver quickly, indicator lamps that are used to notify
the driver for the condition of all parts, with the function of illuminating the instruments and
meters.

It includes speedometer with mileage, water temperature meter, fuel meter, engine tachometer,
fuel warning lamp, warning lamp for unclosed door, engine warning lamp, warning lamp for
engine oil, brake system warning lamp, ABS warning lamp, seat belt warning lamp, air bag
warning lamp, generator warning lamp, turning signal indicator lamp, danger warning
flashing indicator lamp, headlight high beam indicator lamp, fog lamp, multi-function display,
control unit, power supply assembly unit, printed circuit board, etc. (Illustration -1)

External appearance of instruments (Illustration – 1)

T-22

System components and functions are as follows:

Name of Component

Function

Speedometer

The indicator needle of speedometer is moving as
per the signal from speed sensor, indicating the
driving speed of the car.

Tachometer

The indicator needle of tachometer is moving as per
the signal from ignition, indicating the engine
rotation speed.

Water

temperature

meter

The indicator needle of water temperature meter is
moving as per the signal from sensor, indicating the
engine coolant temperature.

Fuel meter

The indicator needle of fuel meter is moving as per
the signal from sensor, indicating the remaining
fuel quantity in the fuel tank.

Odometer

The odometer, counting the car’s gross traveling
distance as per the pulse signal from speed sensor,
may switch over within short distance.

Dual short-range

Odometer

The dual short-range odometer, counting the car’s
traveling distance as per the pulse signal from the
speed sensor, and may be reset by the switch.

Power module

The regulator circuit installed in the power module
is supplying current to various components of the
instruments through fuse S21 10A.

Combination

instrument

Circuit board

This board is containing the circuitry systems of
various meters and measuring instruments, warning
lamps and indicator lamps, as well as warning
activating circuits for the engine oil level, odometer
and short-range odometer and the circuit system of
various indicator lamps.

Speed sensor

Installed in gearbox, this sensor transmits the pulse
signal according to the output shaft rotation speed
to the combination instrument.

Water temperature sensor

This sensor, which converts the engine coolant
temperature into resistance, transmits the relevant
signal to the combination instrument.

Fuel sensor

This sensor, which converts the residual fuel oil
level in the fuel tank into resistance, transmits the
relevant signal to the combination instrument.

Warning switch for fuel level

When the fuel level drop down to the preset level,
the level sensor signal activates the circuit in the
fuel meter and switches on the warning lamp.

T-23

Warning switch for low oil pressure

The switch is installed on the engine body. When
the oil pressure drops, the switch will be activated
and switched on the warning lamp.

Warning switch for engine oil level

The switch is installed in the engine oil tank. When
the level of engine oil drops, the warning lamp will
be switched on.

Warning switch for brake oil level

The switch is installed in the main pump oil storage
tank of the brake. When the brake oil level drops,
the warning lamp will be switched on.

Brake switch

The switch is installed on the driving brake pedal
bracket. When the pedal is pressed, the switch will
be activated to switch on the warning lamp.

Courtesy lamp switch

When the car door is opened, the switch will be
activated to switch on the warning lamp.

Warning lamp

When an abnormal condition is detected, the
warning signal will be transmitted or grounded
automatically, thus switching on the relevant
warning lamp.

Indicator lamp

The warning signal will be transmitted or grounded
automatically, thus switching on the relevant
indicator lamp or keep the driver informed of the
relevant status.

PRINCIPLE OF INSTRUMENTATION SYSTEM

Schematic diagram of instrumentation circuit

The combination instrument is connected with the wiring harness of the instrument via a
28-socket connector.

T-24

high beam warning lamp

fuel warning lamp

digital clock

single socket plug in connector

fuel pressure warning lamp

engine over temperature warning

lamp

instrumental panel illuminator

instrumental panel illuminator

instrumental panel illuminator

multi function display

ABS warning lamp

left turn light

right turn light

generator charging warning lamp

hand brake warning lamp

Multiplexer

voltage regulator

fuel sensor

coolant temperature sensor

RPM sensor

preset level comparator

light relay

light relay

light switch

fuel
pressure
switch

water

temperature

signal of ECU

fuel sensor

door switch engine ECU

engine

blue and white

gray

gray and red brow

purple

and black

blue

brown

and white

green and

red

purple
and black

purple

and black

yellow
and

blue and

yellow

brown and

yellow

green and

red

purple

black

white and

blue

red

black and

brown

brown

and white

brown

and green

red and black

black

and brown

brown and gray

speed,

steering device

hand
brake
switch
/ brake
oil

black

and

b

rotary speed
signal of
ECU

seat belt

air bag

diagnosi

s

left turn

light

right turn

light,

ABS

computer,

T-25