Isuzu KB P190. Manual — part 198

TROUBLESHOOTING 6 – 7

4. Excessive Fuel Consumption

Step Action Value(s)

Yes

No

1

Was the air cleaner element clogged?

—

Clean

or

replace the air

cleaner

element. Go

to

Step 2

2

Was the air leakage found from the air intake side of
the turbocharger?

—

Repair

or

replace the air

intake side of

the

turbocharger. Go

to

Step 3

3

Was the turbocharger working completely?

—

Go to Step 4

Replace the

turbocharger

4

Was there the fuel leakage?

—

Repair

or

replace the fuel

leakage part.

Go to Step 5

5

Was the compression pressure OK?

3.0 MPa

(31.0 kg/cm

2

,

441 psi) at

200 rpm

Go to Step 6

Readjust the

valve clearance

or replace the

cylinder head

gasket or

cylinder liner or
piston or piston

ring or valve

and valve seat

6

Was the injection nozzle pressure or spray pattern
normal?

—

Go to Step 7

Replace the

injection nozzle

7

Are any DTC stored?

—

Go

to

indicated

DTC Solved

6 – 8 TROUBLESHOOTING

5. Excessive Oil Consumption

Step Action Value(s)

Yes

No

1

Does the air cleaner element conditon OK? (Clogged
or not)

—

Go to Step 2

Clean or

replace the air

cleaner

element

2

Does PCV (Positive Crankcase Ventilation) Valve
has problem?

—

Repair

or

replace the

relation parts.

Go to Step 3

3

Was the oil pressure value more than normal value?

Less than

588 kPa (6.0

kg/cm

2

,

85

psi)

Repair or

replace the oil

relief valve

Go to Step 4

4

Inspect the front and rear crankshaft oil seal.

Was the oil leakage found?

—

Replace the

failure part.

Go to Step 5

5

Was the oil leakage found from any gasket?

—

Replace

the

wrong gasket

Go to Step 6

6

Inspect the valve stem seal, the valve stem and the
valve guide for worn.
Were any worn found?

—

Replace the

worn part.

Go to Step 7

7

Was the oil leakage found from the turbocharger oil
seal?

—

Replace the oil

seal. Go

to

Step 8

8

Was the oil drain pipe of the turbocharger restricted?

—

Repair

or

replace the oil

drain pipe.

Go to Step 9

9

Was the oil drain passage in the turbocharger center
housing restricted?

—

Clean

the

center housing

Go to Step 10

10

Does turbine wheel has any impact damage?

—

Replace

the

turbocharger Go

to

Step 11

11

Are any DTC stored?

—

Go

to

indicated

DTC Solved

TROUBLESHOOTING 6 – 9

6. Overheating

Step Action Value(s)

Yes

No

1

Was the engine coolant level OK?

—

Go to Step 2

Replenish the

coolant

2

Was the water leakage or the radiator restriction
found? (Include radiator cap)

—

Repair

or

replace the

leakage part.

Go to Step 3

3

Was the fan belt slippage found?

—

Tension

or

replace the fan

belt. Go

to

Step 4

4

Was the fan clutch working completely?

—

Go to Step 5

Replace the fan

clutch

assembly.

5

Was the oil leakage found from fan clutch?

—

Replace the fan

clutch

assembly Go

to

Step 6

6

Was the thermostat working normally?

—

Go to Step 7

Replace the

thermostat.

7

Was the water pump working OK?

—

Go to Step 8

Replace the

water pump

assembly.

8

Was the restriction by the foreign materials in the
cooling system found? For example, clog the water
hose between the cylinder body and radiator etc..

—

Clean

or

replace the

clog part.

Go to Step 9

9

Was the water leakage found from the sealing cap
on the cylinder body?

—

Replace

the

sealing cap or

replace the

cylinder body.

Go to Step 10

10

Are any DTC stored?

—

Go

to

indicated

DTC. Solved

7. White Exhaust Smoke

Step Action Value(s)

Yes

No

1

Was the compression pressure OK?

3.0 MPa

(31.0 kg/cm

2

,

441 psi) at

200 rpm

Go to Step 2

Readjust the

valve clearance

or replace the

cylinder head

gasket or

cylinder liner or
piston or piston

ring or valve

and relation

parts.

2

Was the PCV (Positive Crankcase Ventilation) valve
working completely?

—

Go to Step 3

Repair or

replace the
PCV valve.

3

Was the turbocharger working completely?

—

Go to Step 4

Replace the

turbocharger.

4

Are any DTC stored?

—

Go

to

indicated

DTC Solved

6 – 10 TROUBLESHOOTING

8. Dark Exhaust Smoke

Step Action Value(s)

Yes

No

1

Was the air cleaner element normal condition?

—

Go to Step 2

Clean or

replace the air

cleaner

element

2

Was the EGR valve sticking?

—

Replace

the

EGR valve

Go to Step 3

3

Was the injection nozzle pressure or the injection
spray pattern OK?

—

Go to Step 4

Replace the

injection nozzle

4

Was the oil leakage found from the turbocharger oil
seal?

—

Replace the oil

seal Go

to

Step 5

5

Was the oil drain pipe of the turbocharger restricted?

—

Repair

or

replace the oil

drain pipe

Go to Step 6

6

Was restricted the oil drain passage in the
turbocharger center housing restricted?

—

Clean

the

center housing

Go to Step 7

7

Does turbine wheel has any impact damage?

—

Replace

the

turbocharger Go

to

Step 8

8

Does PCV (Positive Crankcase Ventilation) Valve
has problem?

—

Repair

or

replace the

relation parts

Go to Step 9

9

Are any DTC stored?

—

Go

to

indicated

DTC Solved