Sym Fiddle III 50 Service Manual page 126

SYM
Throttle position sensor illustration
ET SENSOR
O
ACG/FLY
WHEEL
CPS CPS CPS CPS
Throttle position sensor illustration
TPS TPS
TPS TPS
Basic Principle
Throttle position sensor is a rotary variable resistance, the resistance value and the voltage value will be
change when rotate the TPS, the voltage values to reflect that how much throttle position opened,
feedback measuring throttle position to the ECU as the basis of control engine.
Throttle position sensor basic illustration
1.Use of ECU provide DC 5V power supply, a total of three pin plug, 1 branch voltage output pin; 1 for the
grounding pin;1 for
2.Its main composition is a precise variable resistance
3.Device on carburetor , provide perceive to ECU and judge the APP PID of throttle, according to the
signal to control the valve capacity and the angle of ignition.
4.Device nearby the carburetor, Through the carburetor throttle turns, the linear change of output voltage
signal, supply Electronic control unit and ignition Angle.
4
. ELECTRONICALLY CONTROLLED CARBURETOR SYSTEM
TPS
SENSOR
2
ECU ECU
ECU ECU
VC VC VC VC
5V 5V 5V 5V
VTA VTA
VTA VTA
E E E E
.
ECU
BATTERY
The output voltage The output voltage The output voltage The output voltage
characteristic of TPS characteristic of TPS
characteristic of TPS characteristic of TPS
6 6 6 6
4 4 4 4
2 2 2 2
0 0 0 0
Ignition coil
Spark
plug
50 50 50 50 100 100 100 100 150 150 150 150
The throttle opening The throttle opening The throttle opening The throttle opening
Angle Angle
Angle Angle
4-7