Trouble Diagnosis - Sym HD 125 Service Manual

Trouble Diagnosis

No voltage
Battery discharged
The cable disconnected
The fuse is blown
Improper operation of the main switch
Low voltage
The battery is not fully charged
Poor contact
Poor charging system
Poor voltage regulator
No spark produced by spark plug
The spark plug is out of work
The cable is poorly connected, open or
short-circuited
- Between AC.G. and C.D.I.
Poor connection between C.D.I. and ignition
coil
- Poor connection between C.D.I. and the
main switch
Poor main switch
Poor C.D.I.
AC.G. is out of work
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
Intermittent power supply
The connector of the charging system becomes
loose
Poor connection of the battery cable
Poor connection or short-circuit of the
discharging system
Poor connection or short-circuit of the power
generation system
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Charging system does not operate
properly
Burnt fuse
Poor contact, open or short circuit
Poor regulator
Poor ACG
Engine does not crank smoothly
Primary winding circuit
- Poor ignition coil
- Poor connection of cable and connectors
- Poor main switch
Secondary winding circuit
- Poor ignition coil
- Poor spark plug
- Poor ignition coil cable
- Current leakage in the spark plug
Incorrect ignition timing
- Poor AC.G.
- Improper installation of the pulse sensor
- Poor C.D.I.
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
The starter motor run in reverse direction
Poor battery
17. ELECTRICAL SYSTEM
17-3