Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 537

6 – 22 TROUBLESHOOTING

1509

OIL PRESSURE DOES NOT RISE

Checkpoint

Trouble

Cause

Countermeasure

Engine oil

Improper viscosity engine oil

Insufficient engine oil

Replace the engine oil

Correct the engine oil volume

Defective oil pressure gauge or

unit

Defective indicator light

Repair or replace the oil

pressure gauge or unit

Replace the indicator light

Oil pressure gauge or unit
Oil pressure indicator light

Clogged oil filter element

Replace the oil filter element or

the oil filter cartridge

Oil filter

Relief valve sticking and/or

weak bypass valve spring

Replace the relief valve and/or

the bypass valve spring

Relief valve and bypass valve

Clogged oil pump strainer

Clean the oil pump strainer

Worn oil pump related parts

Replace the oil pump related

parts

Rocker arm shaft

Worn rocker arm bushing

Replace the rocker arm

bushing

OK

OK

OK

OK

NG

NG

NG

NG

NG

NG

NG

Continued on the next page

Oil pump

OK

TROUBLESHOOTING 6 – 23

Checkpoint

Trouble

Cause

Countermeasure

Camshaft

Worn camshaft and camshaft

bearing

Replace the camshaft and the

camshaft bearings

Worn crankshaft and bearings

Replace the crankshaft and/or

the bearings

NG

NG

Continued from the previous page

Crankshaft and bearings

OK

OK

6 – 24 TROUBLESHOOTING

1510

ABNORMAL ENGINE NOISE

1. Engine knocking

Checkpoint

Trouble

Cause

Countermeasure

Check to see that the engine has been thoroughly warmed up before beginning the troubleshooting procedure.

2. Gas Leakage Noise

Fuel

Fuel unsuitable

Replace the fuel

Fuel injection timing improperly

adjusted

Adjust the fuel injection timing

Fuel injection timing

Improper injection nozzle

starting pressure and spray

condition

Adjust or replace the injection

nozzle

Injection nozzle

Blown out head gasket

Broken piston ring

Replace the head gasket or the

piston ring

Compression pressure

OK

OK

OK

NG

NG

NG

NG

Loosely connected exhaust

pipes

Broken exhaust pipes

Tighten the exhaust pipe

connections

Replace the exhaust pipes

Injection nozzles and/or glow

plugs

Loose injection nozzles and/or

glow plugs

Replace the washers

Tighten the injection nozzles

and/or the glow plugs

OK

NG

NG

Continued on the next page

Exhaust pipes

TROUBLESHOOTING 6 – 25

Checkpoint

Trouble

Cause

Countermeasure

3. Continuous Noise

Exhaust manifold

Loosely connected exhaust

manifold and/or glow plugs

Tighten the exhaust manifold

connections

Damaged cylinder head gasket

Replace the cylinder head

gasket

NG

NG

Continued from the previous page

Cylinder head gasket

OK

OK

Fan belt

Loose fan belt

Readjust the fan belt tension

Loose cooling fan

Retighten the cooling fan

Cooling fan

Worn or damaged water pump

bearing

Replace the water pump

bearing

Water pump bearing

Defective generator or vacuum

pump

Repair or replace the generator

or the vacuum pump

Generator or vacuum pump

Valve clearance improperly

adjusted

Adjust the valve clearance

OK

OK

OK

NG

NG

NG

NG

NG

Valve clearance

OK