Sym Fiddle III 50 - ECU Sensor Fault Diagnosis (TPS, Air Valve, O2 Sensor)

SYM 4
. ELECTRONICALLY CONTROLLED CARBURETOR SYSTEM
4-13
Throttle Position Sensor fault:
When throttle position sensor problem happened, the software shows that throttle signal too low(show as
the above picture)
Air compensating valve failure:
When solenoid valve problem happened, the software shows that air valve open circuit (show as the
above picture)
O
2
sensor fault
When engine is cold, the software can not check whether O
2
sensor is normal or not.It shuld start the
engine then let the software judge and inspect whether O2 sensor is normal or not.