Engine speed not steady
Component
Cause
Action
Fuel injection system
Injector defective
Replace (→ Page 97).
Speed sensor
Defective
Notify Service.
Fuel system
Air in fuel system
Bleed fuel system (→ Page 103).
Engine Control Unit
Defective
Notify Service.
Charge air temperature too high
Component
Cause
Action
Engine coolant
Incorrect coolant concentration
Check (MTU test kit).
Intercooler
Dirty
Notify Service.
Engine room
Air-intake temperature too high
Check fans and air intake/exhaust
pipes.
Charge-air pressure too low
Component
Cause
Action
Air supply
Air filter clogged
Clean.
Intercooler
Dirty
Notify Service.
Turbocharger
Defective
Notify Service.
Coolant leakage from intercooler
Component
Cause
Action
Intercooler
Leaking, significant coolant loss
Notify Service.
Black smoke from exhaust
Component
Cause
Action
Air supply
Air filter clogged
Clean.
Fuel injection system
Injector defective
Replace (→ Page 97).
Engine
Overloaded
Notify Service.
Blue smoke from exhaust
Component
Cause
Action
Engine oil
Too much oil in engine
Drain engine oil (→ Page 112).
Oil separator on crankcase venting sys-
tem dirty
Replace (→ Page 85).
Turbocharger, cylinder
head, piston rings, cyl-
inder liner
Defective
Notify Service.
White smoke from exhaust
Component
Cause
Action
Engine
Not at operating temperature
Run engine to reach operating tempera-
ture.
Fuel system
Water in fuel
Check fuel system at fuel prefilter
M015695/03E 2013-03
| Troubleshooting | 57
TIM-ID: 0000002541 - 002
