Engine does not reach rated speed
Component
Cause
Measure
Fuel supply
Fuel supply blocked
Completely open shutoff valve upstream
of fuel prefilter.
Fuel prefilter clogged
Replace (→ Page 183).
Easy-change fuel filter clogged
Replace (→ Page 172).
Air supply
Air filter clogged
Check signal ring position of contamina-
tion indicator (→ Page 190).
Fuel injection equip-
ment
Injector faulty.
Replace (→ Page 163).
Injection pump faulty
Replace (→ Page 160).
Engine wiring
Faulty.
Engine
Overloaded
Contact Service.
Engine speed not steady
Component
Cause
Measure
Fuel injection equip-
ment
Injector faulty.
Replace (→ Page 163).
Injection pump faulty
Replace (→ Page 159).
Speed sensor
Faulty.
Contact Service.
Fuel system
Air in fuel system
Vent fuel system (→ Page 170).
ECU
Faulty.
Contact Service.
Charge-air temperature too high
Component
Cause
Measure
Engine coolant
Engine coolant treatment incorrect
Check (MTU test kit).
Intercooler
Contaminated.
Contact Service.
Engine room
Air-intake temperature too high
Check fan.
Check air inlet/outlet ducts.
Charge-air pressure too low
Component
Cause
Measure
Air supply
Air filter clogged
Check signal ring position of contamina-
tion indicator (→ Page 190).
Intercooler
Contaminated.
Contact Service.
Exhaust turbocharger
Faulty.
Contact Service.
Coolant leaks at intercooler
Component
Cause
Measure
Intercooler
Leaking, major coolant discharge.
Contact Service.
132 | Troubleshooting | MS150031/06E 2016-010
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