Problem Main causes Remedy
Radiator coolant level caution lamp
lights up.
Lowered coolant level, leakage of
coolant
Check, add coolant, repair. See
CHECKS BEFORE STARTING.
Dirt or scale accumulated in cooling
system
Change coolant, flush inside of cool-
ing system. See WHEN REQUIRED.
Clogged radiator fins or damaged fin Clean or repair. See EVERY 500
HOURS MAINTENANCE.
Defective thermostat Replace thermostat. (*)
Loosened radiator filler cap (in high
altitude operation)
Tighten cap or replace packing.
Defective coolant level sensor Replace sensor.
Defective monitor Replace monitor.
Starting motor turns but engine does
not start.
Lack of fuel
Add fuel. See CHECKS BEFORE
STARTING.
Air in fuel system
Repair place where air is sucked in.
See EVERY 500 HOURS MAINTE-
NANCE.
Defective fuel injection pump or de-
fective nozzle
Replace pump or nozzle. (*)
Starting motor turns engine sluggish-
ly.
See ELECTRICAL SYSTEM.
Preheating caution lamp does not
light up.
See ELECTRICAL SYSTEM.
Defective compression
(Defective valve clearance)
Adjust valve clearance. (*)
Exhaust gas color is white or bluish. Water entry in KDPF Check, repair. (*)
Broken KDPF Replace KDPF. (*)
Excessive oil in oil pan Set oil to specified level. See
CHECKS BEFORE STARTING.
Improper fuel Replace with specified fuel.
Exhaust gas turns black from time to
time.
Broken KDPF Replace KDPF. (*)
Combustion makes breathing sound
from time to time.
Defective nozzle Replace nozzle. (*)
Abnormal noise is generated.
(Combustion or mechanical)
Low grade fuel being used Replace with specified fuel.
Overheating Refer to "Radiator coolant level cau-
tion lamp lights up" above.
KDPF broken internally Replace KDPF. (*)
Excessive valve clearance Adjust valve clearance. (*)
TROUBLES AND ACTIONS OPERATION
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