Sym Fiddle III 50 Service Manual page 129

4. ELECTRONICALLY CONTROLLED CARBURETOR SYSTEM
O SENSOR ILLUSTRATION:
2
ACG/FLY WHEEL ACG/FLY WHEEL
ACG/FLY WHEEL ACG/FLY WHEEL
CPS CPS
CPS CPS
Basic Principle
Use of DC 9~16V power supply, a total of two pin plug, 1 for the signal grounding pin; 1 for the O
pin.
O Sensor output feedback signal to Electronic controlled unit and Formed near the fuel ratio controlled
2
in the range of 14.5 ~ 14.7 fuel closed loop control
When the air-fuel ratio is controlled reaching to equivalent point, CO/HC/Nox can have the maximize
conversion.
Testing Procedures & Detection judge:
1. Use after-sales service software inspect the O
Start the vehicle
●
Throttle fully opened and keep 3 minutes.
●
Observe whether the fault light is blinking.
●
The blinking frequency of the fault light is 4 times, judgment as failure.
●
2. Use after-sales service software inspect the O
Start the vehicle
●
Throttle fully opened and keep 3 minutes.
●
Observe whether the voltage of the O
●
If the figure no change, judging the O
●
Treatment of abnormal phenomena:
The O sensor is damage, or adapter connector poor contact.
●
2
Check whether there is any abnormal on main distribution line.
●
When the engine temperature sensor is abnormal, suggestion is to replace new engine temperature
●
sensor and recheck it.
4-10
ET SENSOR ET SENSOR ET SENSOR ET SENSOR
TPS TPS
TPS TPS
O O O O SENSOR SENSOR SENSOR SENSOR
2 2 2 2
sensor is between 0~1V.
2
sensor doesn't work.
2
ECU ECU
ECU ECU
BATTERY BATTERY BATTERY BATTERY
Sensor working position.
2
Sensor working position.
2
SYM
IGN COIL IGN COIL
IGN COIL IGN COIL
PLUG PLUG
PLUG PLUG
signal
2