Operating instructions

Component Cause Measure
Fuel injection equip‐
ment
Injector faulty Replace (→ Page 129).
Engine wiring Faulty Check (→ Page 185).
Engine Overloaded Contact Service.
Engine speed not steady
Component Cause Measure
Fuel injection equip‐
ment
Injector faulty Replace (→ Page 129).
Speed sensor Faulty Contact Service.
Fuel system Air in fuel system Vent fuel system (→ Page 135).
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 fans and air supply / ventilation
ducts.
Charge-air pressure too low
Component Cause Measure
Air supply Air filter clogged Check signal ring position of contami‐
nation indicator (→ Page 152).
Intercooler Contaminated Contact Service.
Exhaust turbocharger Faulty Contact Service.
Coolant leaks at intercooler
Component Cause Measure
Intercooler Leaking, major coolant discharge Contact Service.
Black exhaust gas
Component Cause Measure
Air supply Air filter clogged Check signal ring position of contami‐
nation indicator (→ Page 152).
Fuel injection equip‐
ment
Injector faulty Replace (→ Page 129).
Engine Overloaded Contact Service.
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