Isuzu KB P190. Manual - part 200

TROUBLESHOOTING  6 – 15 

12. Oil Leakage from Turbocharger 

Step Action  Value(s) 

Yes 

No 

1 

Inspect the oil leakage area. 
Was the oil feed pipe eye bolt loose or the gasket 
broken? 

—

 

Tighten the eye 

bolt or replace 

the gasket. 

Go to Step 2 

2 

Were the V band fixing faces tight? 

—

 

Tighten band or 

replace the 

turbocharger Go 

to 

Step 3 

3 

Was there oil leakage from the flange of the turbine 
housing? 

—

 Replace 

the 

turbocharger Go 

to 

Step 4 

4 

Was there oil leakage from the flange of compressor 
housing? 

—

 

Tighten the bolt 

and/or hose 

clamp. Go 

to 

Step 5 

5 

Are any DTC stored? 

—

 Go 

to 

indicated 

DTC Solved 

 
13. Insufficient Acceleration and/or Lack of Power due to turbocharger 

Step Action  Value(s) 

Yes 

No 

1 

Inspect the air or exhaust route. 
Was the air and/or exhaust gas piping loose? 

—

 Tighten 

flange 

bolts or hose 

clamp. Go 

to 

Step 2 

2 

Inspect the work of waste gate valve control. 
Was there rust on the linkage rod or pin of the waste 
gate valve? 

—

 

Replace the 

turbocharger Go 

to 

Step 3 

3 

Was air leakage found from the actuator piping? 

—

 Repair 

or 

replace the 

actuator pipe or 

hose/ Go 

to 

Step 4 

4 

Inspect the inside of the turbocharger. 
Was the turbine shaft end nut loose? 

—

 Replace 

the 

turbocharger Go 

to 

Step 5 

5 

Were the turbine blades bent? 

—

 Replace 

the 

turbocharger Go 

to 

Step 6 

6 

Was the turbine wheel rubbing against housing? 

—

 Replace 

the 

turbocharger Go 

to 

Step 7 

7 

Are any DTC stored? 

—

 Go 

to 

indicated 

DTC Solved 

 

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 Action  Value(s) 

Yes 

No 

1 Was 

“

Visual/Physical Check" performed. 

 

—

 

Go to Step 2 

Go to 

visual/physical 

check 

2 

Inspect the brush contact condition on the generator.
Was there poor contact between the brush and the 
slip ring? 

—

 Repair 

or 

replace the 

brush and/or 

the slip ring. 

Go to Step 3 

3 

Inspect the stator coil on the generator. 
Was there an open circuit or the scorching on the 
stator coil? 

—

 

Replace the 

stator coil. 

Go to Step 4 

4 

Inspect the rotor coil on the generator. 
Was there an open circuit or the scorching on the 
rotor coil? 

—

 

Replace the 

rotor coil. 

Go to Step 5 

5 

Inspect the rectifier on the generator. 
Was the rectifier defective? 

—

 Replace 

the 

rectifier Go 

to 

Step 6 

6 

Inspect the IC regulator. 
Was the IC regulator defective? 

—

 

Replace the IC 

regulator. Go 

to 

Step 7 

7 

Are any DTC stored? 

—

 Go 

to 

indicated 

DTC. Solved 

 

14-2 Battery Overcharging 

Step Action  Value(s) 

Yes 

No 

1 Was 

“

Visual/Physical Check" performed. 

 

—

 

Go to Step 2 

Go to 

visual/physical 

check 

2 

Inspect the terminal circuit. 
Were the B and F terminals shorted? 

—

 Repair 

the 

short circuit. 

Go to Step 3 

3 

Check the regulating voltage. 
Was the IC regulator voltage excessive? 

—

 

Replace the IC 

regulator. Go 

to 

Step 4 

4 

Are any DTC stored? 

—

 Go 

to 

indicated 

DTC. Solved 

 

TROUBLESHOOTING  6 – 17 

14-3 Battery Under Charging 

Step Action  Value(s) 

Yes 

No 

1 Was 

“

Visual/Physical Check" performed. 

 

—

 

Go to Step 2 

Go to 

visual/physical 

check 

2 

Inspect the brush contact condition on the generator.
Was there intermittent contact between the brush 
and the slip ring? 

—

 Repair 

or 

replace the 

brush holder 

assembly. Go 

to 

Step 3 

3 

Inspect the rotor coil on the generator. 
Was there a short circuit in the rotor coil? 

—

 Repair 

or 

replace the 

rotor coil. 

Go to Step 4 

4 

Inspect the stator coil on the generator. 
Was there an open circuit or the short circuit on the 
stator coil? 

—

 Repair 

or 

replace the 

stator coil. 

Go to Step 5 

5 

Inspect the rectifier on the generator. 
Was the rectifier defective? 

—

 Replace 

the 

rectifier Go 

to 

Step 6 

6 

Inspect the IC regulator on the generator. 
Was the IC regulator defective? 

—

 

Replace the IC 

regulator. Go 

to 

Step 7 

7 

Was the electrical load excessive? 

—

 Replace 

more 

higher capacity 

generator. Go 

to 

Step 8 

8 

Are any DTC stored? 

—

 Go 

to 

indicated 

DTC. Solved 

 

14-4 Battery Unstable Charging Current 

Step Action  Value(s) 

Yes 

No 

1 Was 

“

Visual/Physical Check" performed. 

 

—

 

Go to Step 2 

Go to 

visual/physical 

check 

2 

Inspect the brush contact condition on the generator.
Was there poor contact between the brush and the 
slip ring? 

—

 Repair 

or 

replace the 

brush and/or 

the slip ring. 

Go to Step 3 

3 

Inspect the rotor coil on the generator. 
Was there the short circuit or an open circuit in the 
rotor coil? 

—

 Repair 

or 

replace the 

rotor coil. 

Go to Step 4 

4 

Inspect the stator coil on the generator. 
Was there an open circuit or the short circuit in the 
stator coil? 

—

 Repair 

or 

replace the 

stator coil. 

Go to Step 5 

5 

Inspect the connection between the rectifier and 
stator coil on the generator. 
Was there a loose connection between the rectifier 
and stator coil ? 

—

 

Repair the 

loose 

connection. Go 

to 

Step 6 

6 

Inspect the IC regulator on the generator. 
Was the IC regulator defective? 

—

 

Replace the IC 

regulator. Go 

to 

Step 7 

7 

Are any DTC stored? 

—

 Go 

to 

indicated 

DTC. Solved 

 

6 – 18  TROUBLESHOOTING 

14-5 Charging System Noise 

Step Action  Value(s) 

Yes 

No 

1 Was 

“

Visual/Physical Check" performed. 

 

—

 

Go to Step 2 

Go to 

visual/physical 

check 

2 

Was there intermittent noise or continuous noise and 
that could be identified clearly by increasing and 
decreasing engine speed? 

—

 

Replace the 

bearing. Go 

to 

Step 3 

3 

Was there a growling sound and does this sound 
stop when the connector was disconnected? 

—

 Replace 

the 

stator coil. 

Go to Step 4 

4 

Was intermittent sound heard when the generator 
was running? 

—

 Replace 

the 

brush and/or 

slip ring. 

Go to Step 5 

5 

Was frictional sound heard when generator was 
running? 

—

 

Clean the slip 

ring or replace 

the brush. 

Go to Step 6 

6 

Are any DTC stored? 

—

 Go 

to 

indicated 

DTC. Solved