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mitsubishi fg15n repair parts manual ELECTRICAL SYSTEM Troubleshooting

Starter System

Starter switch

1).Starter will not crank engine

Weak or dead battery — Recharge or replace.
Short or open circuit — Repair or replace.
Poor continuity in starter switch — Replace.
Starter or starter relay defective — Replace.
Forward-reverse lever not in neutral position–Move lever to neutral position .

2).Turning off starter switch will not stop engine

Open or short circuit  — Repair or replace.
Control timer defective —  Replace.

Gauges

Water temperature gauge

1)Will not indicate at all

Printed circuit board defective — Replace.
Open or short circuit — Repair or replace.
Gauge internally defective — Replace.
Gauge unit defective — Replace.

2)Will not indicate accurately

Gauge or gauge unit not of the type called for one– Replace to a correct.
Loose terminal connection –Repair.

3)Will indicate higher than actual temperature

Circuit between gauge and gauge unit grounded–Repair.
Gauge internally defective –Replace.

Fuel gauge

1)Will not indicate at all

Printed circuit board defective — Replace.
Open or short circuit — Repair or replace.
Gauge internally defective– Replace.
Gauge unit defective– Replace.

2)Will not indicate accurately

Gauge or gauge unit not of the type called for one — Replace to a correct .
Loose terminal connection –Repair.

3)Will indicate “full” regardless of amount of fuel left in tank

Circuit between gauge and gauge unit open or short– Repair.
Gauge internally defective –Replace.
Gauge unit defective –Replace.

4)Will indicate “empty” regardless of amount of fuel left in tank

Circuit between gauge and gauge unit grounded– Repair.

Gauge unit defective — Replace.
Gauge internally defective — Replace.

Lighting System

Lamps – general

1)Will not light

Weak or dead battery — Recharge or replace.
Fuses blown out– Check and replace.
Open or short circuit– Repair or replace.
Poor grounding –Clean ground spot and remake connection.
Switch defective –Replace.
Bulbs burnt out– Replace.

2)Will light dimly

Weak battery– Check and recharge.
Contact points in switches defective –Repair or replace.
Loose terminals –Repair.
Dirty lenses –Clean.
Waterdrops inside lenses –Dry and replace packings.
Bulbs expired in service life –Replace.

Head lamps

1)Will not light

Lighting switch defective — Replace.
Bulbs burnt out — Replace.

Turn signals

1)Will not flicker

Turn signal switch defective –Replace.
Turn signal relay defective –Replace.

2)Will not light

Turn signal relay defective –Replace.
Bulbs burnt out– Replace.

3)Will flicker too slow

Low wattage of bulbs –Replace to a correct one.
Turn signal relay defective –Replace.

4)Will flicker too fast

High wattage of bulbs -Replace to a correct one.
Turn signal relay defective -Replace.

Other lamps

1)Backup lamps will not light

Backup lamp switch defective  — Repair or replace.
Bulbs burnt out — Replace.

2)License number plate lamp will not light

Lighting switch defective –Replace.
Bulb burnt out –Replace.

Alarm Unit

Horn

1)Will not sound

Fuse blown out –Check and replace.
Open or short circuit– Repair or replace.
Horn switch defective –Replace.
Horn defective –Replace.

2)Will give ugly blast of sound

Horn switch defective –Replace.
Horn defective–Replace.

Battery

Tends to run down rapidly

Drive belt slipping Readjust.
❋ Alternator
Stator coil grounded or open-circuited Repair or replace.
Rotor coil open Replace.
Brushes poorly seating on slip rings Replace brushes if worn Clean holder and polish slip rings.
Diode ruptured Replace.
❋ Regulator
Regulated voltage setting too low Replace.
❋ Battery
Terminal connections loose Clean and retighten.
❋ Wiring
Open or loose connection between starter switch and regulator IC terminal Repair.
Fuse blown, or loosely set in holder Replace and repair.
Open or loose connection between F terminals of regulator and alternator Repair.

❋ Wiring

Tends to get overcharged

Regulator IC and F terminals shorted or miswired Repair.
Poor grounding of regulator F terminal Repair.
❋ Regulator
Pressure coil open-circuited Replace.
Regulated voltage too high Replace.

 

 

 

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