Trouble Diagnosis - Sym GTS 250 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.
 A.C.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
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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
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