Isuzu KB P190. Manual - part 199

 

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Isuzu KB P190. Manual - part 199

 

 

TROUBLESHOOTING  6 – 11 

9. Oil Pressure Does Not Rise 

Step Action  Value(s) 

Yes 

No 

Was the oil pressure warning lamp working OK? 

 

Go to Step 2 

Replace the oil 

pressure 

warning lamp 

Does the oil filter element clog? 

 

Replace the oil 

filter element 

Go to Step 3 

Does the relief valve open? 

 Repair 

or 

replace the 

relief valve 

Go to Step 4 

Does the oil strainer clog? 

 Clean 

or 

replace the oil 

strainer Go 

to 

Step 5 

Was the oil pump working OK? (The pump related 
parts worn etc.) 

 

Go to Step 6 

Repair or 

replace the oil 

pump. 

Was the rocker arm and/or relation parts worn? 

 Replace 

the 

rocker arm 

and/or relation 

parts Go 

to 

Step 7 

Was the camshaft and/or relation parts worn? 

 Replace 

the 

camshaft 

and/or relation 

parts Go 

to 

Step 8 

Was the crankshaft and/or relation parts worn? 

 Replace 

the 

crankshaft 

and/or relation 

parts Go 

to 

Step 9 

Are any DTC stored? 

 Go 

to 

indicated 

DTC Solved 

 

Table of pressure unit 

Pressure kPa 

(kg/cm

2

) 100 

(1.0) 

980 

(10.0)

Resistance ohm 

81 

30 

Electric current 

63.5 

106.7

 

6 – 12  TROUBLESHOOTING 

10. Abnormal Engine Noise 

10

1 Engine knocking 

Step Action  Value(s) 

Yes 

No 

Was the injection nozzle pressure or injection spray 
pattern OK? 

 

Go to Step 2 

Replace the 

injection nozzle

Was the compression pressure OK? 

3.0 MPa 

(31.0 kg/cm

2

441 psi) at 

200 rpm 

Go to Step 3 

Replace the 

cylinder head 

gasket or 

piston ring 

Are any DTC stored? 

 Go 

to 

indicated 

DTC Solved 

 

10

2 Gas leakage noise 

Step Action  Value(s) 

Yes 

No 

Was the exhaust pipe loose or broken? 

 Retighten 

or 

replace the 

exhaust pipe 

Go to Step 2 

Was the exhaust manifold loose? 

 

Retighten or 

replace the 

exhaust 

manifold. Or 

replace the 

exhaust 

manifold gasket 

Go to Step 3 

Was the injection nozzle loose? 

 Retighten 

or 

replace the 

injection nozzle 

fixing bolt 

Go to Step 4 

Was the cylinder head gasket broken? 

 Replace 

the 

cylinder head 

gasket Go 

to 

Step 5 

Are any DTC stored? 

 Go 

to 

indicated 

DTC Solved 

 

TROUBLESHOOTING  6 – 13 

10

3 Continuous noise 

Step Action  Value(s) 

Yes 

No 

Was the fan belt tension OK? 

 13 mm 

(0.35 

 0.51 

in) 

Go to Step 2 

Adjust the fan 

belt tension. 

Was the cooling fan loose? 

 Tighten 

the 

cooling fan 

Go to Step 3 

Was noise coming from the generator? 

 Repair 

or 

replace the 

generator 

and/or the 

vacuum pump 

Go to Step 4 

Was noise coming from the water pump? 

 Replace 

the 

water pump 

Go to Step 5 

Was noise coming from the cylinder head cover? 

 Readjust 

the 

valve 

clearance. Go 

to 

Step 6 

Are any DTC stored? 

 Go 

to 

indicated 

DTC Solved 

 

10-4 Slapping noise 

Step Action  Value(s) 

Yes 

No 

Was noise coming from the cylinder head cover? 

 Go 

to 

Step 2 Go 

to 

Step 4 

Were valve clearances correct? 

0.4 mm 

(0.016 in) 

both intake 

and exhaust

Adjust the 

valve 

clearances Go 

to 

Step 3 

Were the rocker arms damaged? 

 Replace 

the 

rocker arms 

Go to Step 4 

Was the flywheel fixing bolt loose? 

 Tighten 

the 

fixing bolt. 

Go to Step 5 

Was noise coming from the cylinder body? 

 Go 

to 

Step 6 Go 

to 

Step 10

Inspect the crankshaft bearing and/or crankshaft. 
Was the crankshaft bearing and/or crankshaft worn?

 Replace 

the 

worn parts 

Go to Step 7 

Inspect the connecting rod bearing and/or crankpin. 
Was the connecting rod bearing and/or crankpin 
worn? 

 

Replace the 

worn parts 

Go to Step 8 

Inspect the connecting rod small end bushing and/or 
piston pin. 
Was the connecting rod small end bushing and/or 
piston pin worn? 

 

Replace the 

worn parts 

Go to Step 9 

Inspect the piston and/or cylinder liner. 
Was the piston and/or cylinder liner worn or 
damaged? 

 Replace 

the 

worn or 

damaged parts 

Go to Step 10

10 

Are any DTC stored? 

 Go 

to 

indicated 

DTC Solved 

 

6 – 14  TROUBLESHOOTING 

10-5 Excessive turbocharger noise 

The vibration noise (the air aspiration noise) occurred when turbocharger rotates, it is normal condition of the 
turbocharger, no necessary any actions. 

Step Action  Value(s) 

Yes 

No 

Was the excessive noise coming from the 
turbocharger? 

 

Go to Step 2 Go 

to 

Step 10

Inspect the fixing bolts and bands. 
Was any problem found? 

 Tighten 

the 

loose parts 

Go to Step 3 

Was the intake or exhaust system gasket damaged?

 Replace 

the 

damaged 

gasket. Go 

to 

Step 4 

Inspect rotation parts condition. 
Was the turbine wheel rotation rough? 

 Replace 

the 

turbocharger. Go 

to 

Step 5 

Inspect the turbine wheel. 
Was the turbine wheel rubbing against housing? 

 Replace 

the 

turbocharger. Go 

to 

Step 6 

Was the turbine wheel damaged? 

 Replace 

the 

turbocharger. Go 

to 

Step 7 

Were there carbon deposits in the turbine or 
compressor housing? 

 Clean 

or 

replace the 

turbocharger. Go 

to 

Step 8 

Inspect the oil supply condition. 
Was the oil feed pipe clogged? 

 Repair 

or 

replace the oil 

feed pipe. 

Go to Step 9 

Was the turbine shaft bearing worn? 

 Replace 

the 

turbocharger. Go 

to 

Step 10

10 

Are any DTC stored? 

 Go 

to 

indicated 

DTC Solved 

 
11. Rotating Part Wear of Turbocharger 

Step Action  Value(s) 

Yes 

No 

Inspect engine oil. 
Was it contaminated with foreign materials? 

 Replace 

the 

engine oil 

Go to Step 2 

Was the recommended engine oil grade/viscosity 
being used? 

API CD or 

ISUZU 

genuine/ 

10W

30 

Go to Step 3 

Replace the 

engine oil 

Was the oil feed pipe restricted? 

 Clean 

or 

replace the oil 

feed pipe 

Go to Step 4 

Was the oil seal of turbocharger defective? 

 

Replace the oil 

seal Go 

to 

Step 5 

Was the center housing oil drain passage clogged? 

 Clean 

center 

housing or 

replace the 

turbocharger Go 

to 

Step 6 

Was there oil sludge and/or coking on the turbine 
shaft? 

 Replace 

the 

turbocharger Go 

to 

Step 7 

Are any DTC stored? 

 Go 

to 

indicated 

DTC Solved 

 

 

 

 

 

 

 

 

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