Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 536

6 – 18 TROUBLESHOOTING

1506

OVERHEATING

Checkpoint

Trouble

Cause

Countermeasure

Cooling water

Insufficient cooling water

Replenish the cooling water

Oil leakage from the fan

coupling

Replace the fan coupling

Fan coupling (if so equipped)

Fan belt loose or cracked

causing slippage

Replace the fan belt

Fan belt

Defective radiator cap or

clogged radiator core

Replace the radiator cap or

clean the radiator core

Radiator

Defective water pump

Repair or replace the water

pump

Defective sealing cap resulting

in water leakage

Replace the sealing cap

Thermostat

Defective thermostat

Replace the thermostat

OK

OK

OK

OK

NG

NG

NG

NG

NG

NG

NG

Continued on the next page

Water pump

OK

Cylinder head and cylinder body

sealing cap

OK

TROUBLESHOOTING 6 – 19

Checkpoint

Trouble

Cause

Countermeasure

Cooling system

Cooling system clogged by

foreign material

Clean the foreign material from

the cooling system

Fuel injection timing improperly

adjusted

Adjust the fuel injection timing

NG

NG

Continued from the previous page

Fuel injection timing

OK

OK

6 – 20 TROUBLESHOOTING

1507

WHITE EXHAUST SMOKE

Checkpoint

Trouble

Cause

Countermeasure

Fuel

Water particles in the fuel

Replace the fuel

Delayed fuel injection timing

Adjust the fuel injection timing

Fuel injection timing

Blown out cylinder head gasket

Worn cylinder liner

Piston ring sticking or broken

Improper seating between the

valve and the valve seat

Replace the related parts

Compression pressure

Defective turbocharger

Replace the turbocharger

Turbocharger

Defective valve seals

Worn valve stems and valve

guides

Replace the valve seals, the

valve, and the valve guides

OK

OK

OK

NG

NG

NG

NG

NG

Inlet and exhaust valves

Valve seals

OK

TROUBLESHOOTING 6 – 21

1508

DARK EXHAUST SMOKE

Checkpoint

Trouble

Cause

Countermeasure

Air cleaner

Clogged air cleaner element

Clean or replace the air cleaner

element

Injection nozzle injection

starting pressure too low

Improper spray condition

Adjust or replace the injection

nozzle

Injection nozzle

Fuel injection timing improperly

adjusted

Adjust the fuel injection timing

Fuel injection timing

Defective delivery valve

resulting in fuel drippage after

fuel injection

Replace the delivery valve

Injection pump

Excessive injection volume

Adjust the injection volume

OK

OK

OK

NG

NG

NG

NG

NG