Trouble Diagnosis - Sym Mio 50 Service Manual

16. Electrical Equipment

Trouble Diagnosis

Charging System
No power supply
Dead battery
Disconnect battery cable
Fuse burned out
Faulty main switch
Low voltage
Weak battery
Loose battery connection
Charging system failure
Voltage-current regulator failure
Intermittent power supply
Loose charging system cables
Loose battery cables
Poor connection or shorted circuit in discharging
system
Poor connection or shorted circuit in charging
system
Charging system failure
The fuse is blown
Loose, broken or shorted wire or wire
connection
Faulty voltage-current regulator
Faulty alternator
Starting System
Starter motor does not work
The fuse is blown
The battery is not fully charge
Poor main switch
Poor starter switch
The front and rear brake switches do not
operate correctly
Starter relay is out of work
The ignition coil is poorly connected, open or
short-circuited
The starter motor is out of work
Weak starter motor
Poor charging system
The battery is not fully charged
Poor connection in the windings
The motor gear is jammed by foreign material
Starter motor is working, but engine does not
crank
Poor starter motor pinion
Poor starter clutch
The starter motor run in reverse direction
Poor battery
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Ignition System
No spark produced by spark plug
The spark plug is out of work
The cable is poorly connected, open or
short-circuited
- Between alternator and C.D.I.
- Between CDI and ignition coil.
- Between CDI and main switch
Poor main switch
Poor C.D.I.
alternator is out of work
Engine does not crank smoothly
Primary coil circuit
- Poor ignition coil
- Poor connection of cable and couplers
- Poor main switch
Secondary coil circuit
- Poor ignition coil
- Poor spark plug
- Poor high-tension cable
- Current leakage in the spark plug cap
Incorrect ignition timing
- Poor alternator
- Improper installation of the pulse sensor
- Poor C.D.I.