Sym Citycom 300i - Trouble Diagnosis

17. Electrical System
17-3
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 Generator ECU
 Poor connection between ECU and ignition coil
 Poor connection between ECU and the main
switch
 Bad main switch
 ECU malfunctions
 AC Generator malfunctions
Starter motor does not work
 The fuse is blown
 The battery is not fully charged
 Bad main switch
 Bad starter switch
 The front or rear brake switches does not
function correctly
 Starter relay is out of work
 The ignition coil is poorly connected, open or
short-circuited
 The starter motor malfunctions
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
 Regulator/Rectifier malfunctions
 AC Generator malfunctions
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
- AC Generator malfunctions
- Improper installation of CPS
- ECU malfunctions
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 runs in reverse direction
 Poor battery
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