Isuzu 4JA1 Workshop Manual page 18

6 – 16 TROUBLESHOOTING
14. Battery Charging and Noise Problem
Visual/physical check the following items before diagnosis.
The drive belt tension.
The battery terminals connection condition.
The ground connection condition.
The generator and the battery fastener condition.
The battery fluid level and specific gravity.
14-1 Battery No Charging
Step
1 Was "Visual/Physical Check" performed.
2 Inspect the brush contact condition on the generator.
Was there poor contact between the brush and the
slip ring?
3 Inspect the stator coil on the generator.
Was there an open circuit or the scorching on the
stator coil?
4 Inspect the rotor coil on the generator.
Was there an open circuit or the scorching on the
rotor coil?
5 Inspect the rectifier on the generator.
Was the rectifier defective?
6 Inspect the IC regulator.
Was the IC regulator defective?
7 Are any DTC stored?
14-2 Battery Overcharging
Step
1 Was "Visual/Physical Check" performed.
2 Inspect the terminal circuit.
Were the B and F terminals shorted?
3 Check the regulating voltage.
Was the IC regulator voltage excessive?
4 Are any DTC stored?
Action
Action
Value(s) Yes
—
Go to Step 2
— Repair or
replace the
brush and/or
the slip ring.
—
Replace the
stator coil.
—
Replace the
rotor coil.
— Replace the
rectifier
— Replace the IC
regulator.
— Go to indicated
DTC.
Value(s) Yes
—
Go to Step 2
— Repair the
short circuit.
— Replace the IC
regulator.
— Go to indicated
DTC.
No
Go to
visual/physical
check
Go to Step 3
Go to Step 4
Go to Step 5
Go to Step 6
Go to Step 7
Solved
No
Go to
visual/physical
check
Go to Step 3
Go to Step 4
Solved