Chery A15. Manual — part 162

Chery A15 Maintenance Manual

90º. The current intensity passing through coils changes with ohmic value of sensor,

therefore the magnetic flux produced by coils in four directions change

correspondingly to rotate magnetic spindle and move gauge pointer.

3. Function and Principle of Water Temperature Sensor

Chery A15 adopts a thermal resistance water temperature sensor, as shown in the

figure.

Coolant temperature sensor serves to measure working temperature of engine, while

ECM provides optimal arrangement of controls according to different temperatures.

Coolant temperature sensor adopts a negative temperature coefficient resistor as the

sensing element;

Terminals: 1-signal grounding, 2-Temperature signal

Installation: Coolant temperature sensor is fixed on coolant lesser circulation passage

behind the engine.

4. Parameters

Working voltage: 5V DC

Working temperature: -40~135C

Resistance: 3560～2260

Ω under normal temperature 20～30ºC

Thermal resistance is made of semiconductor material with negative temperature

coefficient, whose ohmic value sharply declines with the increase in temperature.

Water temperature sensor is serially connected with cross coils in water temperature

gauge. When engine coolant temperature increases, ohmic value of water temperature

sensor decreases, the current passing through cross coils consequentially increases,

and the deflection angle of gauge pointer becomes larger. Contrarily, when engine

Chery A15 Maintenance Manual

coolant temperature increases, the deflection angle of water temperature gauge pointer

becomes smaller.

5. Fuel Gauge

Working condition of fuel gauge is basically the same with water temperature gauge,

and it adopts a cross coil pointer meter, too. As the figure shows (Meter-5), the right

part of the meter is the fuel gauge.

Fuel Gauge (Meter-5)

When floater moves with the level change in fuel tank, the sliding contact linked with

floater rod corresponds to change the ohmic value of thick-film resistor. When the

fuel tank is filled, the ohmic value of thick-film resistor is the minimum, while the

current of cross coils is the maximum, and the fuel gauge pointer points to the

maximum scale mark F. On the contrary, when fuel tank is empty, the ohmic value of

thick-film resistor is the maximum, and fuel gauge pointer points to the scale mark E

with the minimum angle of deflection.

Relationship between fuel level and ohmic value is shown in the table below.

Relationship between Fuel Level and Ohmic Value

Floater Position

Volume (L)

Resistance (Ω)

Empty 0 283

1/2 30

89

Full 55

36

Chery A15 Maintenance Manual

Section Three: Troubleshooting

Component Symptom

Possible

Cause Solution

Remarks

Speedometer

Speedometer

does not

work when

vehicle is

running or

indicates

with notable

discrepancy

with actual

speed

(1) Hall speed sensor

defect.

(2) Pointer stuck.

(3) Worn-out driving

gear of transmission

output shaft or

oversize gear

backlash.

(4) Speedometer

damage.

(5) Engine damage.

(6) Wire connection

fault.

(1) In case the speedometer dose

not work, first check Hall speed

sensor and engagement of driving

gear, if normal then check

speedometer.

(2) Single symptom of inaccurate

indication is generally caused by

internal breakdown.

(3) Check connection between

speed signal and engine, and

signal wire between engine and

speedometer.

Water

temperature

gauge

Water

temperature

gauge has no

indication

after engine

is started

(1) Water temperature

gauge damage.

(2) Water temperature

sensor failure.

(3) Open circuit of

water temperature

gauge.

(4) Voltage stabilizer

damage.

(5) Engine computer

damage.

(1) Open engine hood and unplug

water temperature sensor to check

sensor resistance, if normal then

check signal wires between sensor

and engine computer and between

engine computer and the gauge.

(2) If all the wires are normal,

plug in combination instrument

and turn on ignition switch to

check if the yellow/red wire of

water temperature sensor is

conducted. If yes, the water

temperature sensor is damaged;

and if no, the water temperature

gauge or voltage stabilizer is

damaged.

(3) Demount dashboard with wire

harnesses still connected, connect

a multimeter between anode

terminal 1 and earthing terminal 2

of voltage stabilizer to measure

voltage. If the measured value is

Chery A15 Maintenance Manual

higher than 10.5V or lower than

9.5V, the voltage stabilizer

probably has fault, otherwise it

should be the problem with water

temperature gauge itself.

Fuel gauge

Fuel gauge

pointer does

not move

after ignition

switch is

turned on

(1) Fuel gauge

damage.

(2) Fuel gauge sensor

failure.

(3) Open circuit of

fuel gauge.

(4) Voltage stabilizer

damage.

(5) Fuel tank emptied.

(1) Check if fuel tank is empty.

(2) Turn on ignition switch to see

if water temperature gauge is

working. If yes, the voltage

stabilizer of combination

instrument is normal.

（

3）Unplug fuel gauge sensor

and measure purple/black wire

with a multimeter to see if it is

conducted, and then check the

earthing between brown wire and

vehicle body. If purple/black wire

is conducted and brown wire is

normal, fuel gange sensor is at

fault and shall be replaced.

(4) If purple/black wire is not

conducted, check the purple/black

wire between fuel gauge sensor

plug and hole 21 of combination

instrument plug for open circuit.

Wire transfer route is as follow:

purple/black wire of fuel gauge

sensor plug → hole 3 of relay

board plug M → hole 12 of relay

board plug U1 → brown wire →

hole 21 of combination instrument

plug.

(5) If the circuit is conducted and

brown wire is normal, it should be

fuel gauge fault.

Please

refer to

circuit

diagram

of fuel

gauge

Engine oil

pressure

warning

light

Engine oil

pressure

warning

light keeps

(1) Low pressure

switch (30KPa switch)

fault.

(2) Short circuit of low

First identify whether it is

lubrication system fault or

warning system fault. This is

usually done by measuring oil