Electrical System Troubleshooting - Honda MB5 1982 Shop Manual

ELECTRICAL SYSTEM
TROUBLESHOOTING
BATTERY/CHARGING SYSTEM
No power - key turned on:
1. Dead battery
- Low fluid level
- Low specific gravity
2. Disconnected battery cable
3. Fuse burned out
4. Faulty ignition switch
Low power - key turned on:
1. Weak battery
Low fluid level
- Low specific gravity
- Charging system fai lure
2. Loose battery connection
Low power - engine running:
1. Battery undercharged
- Low fluid level
- One or more dead cells
2. Charging system failure
IGNITION SYSTEM
No spark at plug
1. Faulty spark plug
2. Poorly connected, broken or shorted wires
-Between alternator and COl unit
-Between CDI unit and ignition coil
- Between COl unit and ignition switch
- Between ignition coil and spark plug
3. Faulty ignition switch
4. Faulty ignition coil
5. Faulty COl unit
6. Faulty alternator
13-2
148
~ HONDA
~
MB5
Intermittent power:
1. Loose battery connection
2. Loose charging system connection
3. Loose connection or short circuit in ignition system
4. Loose connection or short circuit in lighting system
Charging system failure:
1. Loose, broken, or shorted wire or connection
2. Faulty rectifier
3. Faulty alternator
Engine starts but runs poorly
1. Ignition primary circuit
- Faulty ignition coil
- Loose or bare wire or connector
- Poor contact in ignition switch
2. Ignition secondary circuit
- Faulty ignition coil
- Faulty spark plug
- Faulty high tension cord
- Faulty plug cap
3. Improper ignition timing
- Faulty alternator
- Stator not installed properly
- Faulty COl unit
Date of Issue : July, 1981
©
HONDA MOTOR CO., L TO.