Component Probable Cause Action
Engine cabling Faulty Check (→ Page 131).
Engine Overloaded Contact Service.
Engine speed not steady
Component Probable Cause Action
Fuel injection equip-
ment
Injector faulty Replace (→ Page 75).
Injection pump faulty Contact Service.
Speed sensor Faulty Contact Service.
Fuel system Air in fuel system Vent fuel system (→ Page 85).
Engine governor Faulty Contact Service.
Charge air temperature too high
Component Probable Cause Action
Engine coolant Engine coolant treatment incorrect Check (MTU test kit).
Intercooler Contaminated Contact Service.
Engine room Air-intake temperature too high Check fans and intake/exhaust lines.
Charge-air pressure too low
Component Probable Cause Action
Air supply Air filter clogged Check signal ring position of service in-
dicator (→ Page 95).
Intercooler Contaminated Contact Service.
Exhaust turbocharger Faulty Contact Service.
Coolant leaks at intercooler
Component Probable Cause Action
Intercooler Leaking, major coolant discharge Contact Service.
Black exhaust gas
Component Probable Cause Action
Air supply Air filter clogged Check signal ring position of service in-
dicator (→ Page 95).
Fuel injection equip-
ment
Injector faulty Replace (→ Page 75).
Injection pump faulty Contact Service.
Engine Overloaded Contact Service.
66 | Troubleshooting | MS150118/00E 2014-07
TIM-ID: 0000051898 - 001
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