Chery A15. Manual — part 117
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
The 28-socket connector of the wiring harness of combination instrument
The function of each socket is described in the table below:
Socket Function Socket
Function
1 No
connected 16
Connecting to the terminal D+ of
generator
2
Connecting to the water warning
switch of water tank
17
Air bag warning signal
3
Terminal 31# (ground)
18
Door light
4
TX1 speed signal of Hall Sensor
19
Seat belt warning lamp
5
Terminal 31#
20
Engine malfunction warning lamp
6
21
Connecting to the fuel meter sensor
7
22
Left-turn signal lamp
8
23
Water temperature signal of the ECU
9
Oil pressure warning switch
(30kpa)
24
Right-turn signal lamp
10 The
ECU
A20RPM 25
Power supply terminal for high beam
indicator lamp
11
Terminal 30#, power supply for
clock and multi-function display
26
Warning switch for brake oil level;
indicator lamp switch for hand brake
12
Terminal 58b#, power supply for
instrument panel illumination
27 Speedometer
sensor
13
Terminal 15#
28
Night illumination
14
ABS warning lamp
15 Diagnostic
wire
T-26
1. SPEED ODOMETER
The Chery sedan A15LHD employs the cross coil type speedometer to indicate the driving
speed and accumulated road mileage, as well as equipped with digital odometer. The section
for measuring car speed employs a magnetic type of structure, while the section for recording
mileage is controlled by multifunction liquid crystal display.
See figure (Illustration-2)
Speedometer (Illustration-2)
The indicator needle is located at the scale zero when the speedometer is not in use. When the
car is driving, the transmission gear in the gearbox is activating and cutting the magnetic flux
of the permanent-magnet of the Hall Speed Sensor, so that the latter will produce pulse
signals to the cross coil type Speed Odometer to drive the indicator needle of speedometer,
and meanwhile it will also provide the same signal to the mileage-recording multifunction
liquid crystal display to control the mileage counting.
2. WATER TEMPERATURE METER
Water temperature meter
The Chery sedan A15LHD employs the water temperature meter equipped with cross coil
type indicator needle. See figure (Illustration-3)—the water temperature meter is located at
left.
Water temperature meter (Illustration-3)
T-27
The pointer head of the cross coil meter is a kind of electromagnetic device. The coils are
round on the surface of its magnetic rotor in four directions, with an included angle of 90º
between the two adjacent coils. The strength of the current passing through the coils is
depended on the resistance of the sensor, so that the magnetic flux densities produced by the
coils in four directions are varied correspondingly, which subsequently activates the rotation
of the magnetic rotor and the movement of indicator needle.
3. FUNCTION AND PREINCIPLE OF WATER TEMPERATURE SENSOR
The water temperature sensor of Chery sedan A15 LHD employs the thermo-sensitive
resistance, which is shown in the figure above:
The coolant temperature sensor is used to inspect working temperature of the engine; the
ECM will provide the best control program for the engine according to different temperature
environment;
Composition and working principle: The sensor is a thermo-sensitive resistance of negative
temperature coefficient (NTC). Its resistance will decrease as the coolant temperature
increases, but not linearly related. This thermo-sensitive resistance of negative temperature
coefficient is loaded into a copper heat-conducted sleeve. The ECU converts the changes of
value of the thermo-sensitive resistance into variable voltages supplying the ECU via a
divider circuit so as to monitor the changes of the water temperature. (ECU’s internal
structure)
Pin: the sensor has 3 interchangeable pins totally.
1 Coolant temperature sensor signal (ECU39#)
2 Sensor signal ground (ECU35#)
3 Another wire is used to connect the water temperature signal of the instrument.
Installation: the coolant temperature sensor is mounted on the sub-loop passage of the coolant
behind the engine.
Notes on installation:
M
aximum tightening torque is 15Nm.
4. PRODUCT CHARACTERISTICS
Working voltage: 5V DC
Working temperature: -40 ~ 135
o
C
Figure of coolant temperature sensor
T-28
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