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. Check (→ Page 218).
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
TIM-ID: 0000002547 - 003
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