Isuzu KB P190. Manual — part 398

6D-4 ENGINE ELECTRICAL (4JK1/4JJ1)

Charging System (4JK1)

RTW56DMF000601

Charging System (4JJ1)

RTW56DMF000101

ENGINE ELECTRICAL (4JK1/4JJ1) 6D-5

Troubleshooting

Symptoms

• No

charging

• Inadequate

charging

• Excessive

charging

• Unstable charging current
• Abnormal generator noise

6D-6 ENGINE ELECTRICAL (4JK1/4JJ1)

No charging

Possible problem

Countermeasure

Dead battery

Replace

Open or shorted wiring

Open or shorted ammeter

Loose wiring connections

Repair

One or more generator coils open or shorted

Bad diode

Bad regulator

Replace

Loose regulator connections

Repair

Inadequate charging

Possible problem

Countermeasure

Dead battery

Replace

Open or shorted wiring

Loose wiring connections

Repair

Loose generator drive belt

Adjust belt tension

Stator coil intermittent short

Bad diode

Replace

Loose battery connections

Repair

Bad regulator

Replace

Loose regulator connections

Repair

Excessive charging

Possible problem

Countermeasure

Bad regulator

Replace

Unstable charging current

Possible problem

Countermeasure

Open wiring connection or broken wire

Repair

Loose generator drive belt

Adjust belt tension

Open or shorted stator coil

Replace

Loose terminal connections

Repair

Bad regulator

Replace

Loose regulator terminal connections

Repair

Abnormal operating noise

Possible problem

Countermeasure

Loose generator drive belt

Adjust belt tension

Bad bearing

Replace

Loose rotor core or stator core

Repair

Bad diode

Replace

Open or shorted stator coil

Replace

ENGINE ELECTRICAL (4JK1/4JJ1) 6D-7

Diagnosis

On-vehicle Inspection

The charging system warning light tells the vehicle
operator of possible problems with the system.

When the ignition switch is moved to the ON position,
the light turns on. The light turns off immediately after
the engine is started. If the light turns on during engine
operation, there is a problem with the charging system.
Perform the checks described below.

1. Check the belt (broken or loose).

2.

Check the harness connectors (loose or

disconnected).

3. With the engine off, turn the ignition switch to the

ON position. If the warning lamp does not light,

remove the harness connector from the generator.

Ground the connector IG terminal. The lamp

should light. If it does not, the bulb is burned out.

Replace the bulb.

4. Start the engine. If the warning lamp remains on,

the generator must be repaired or replaced.