Component Probable Cause Task
Engine wiring Defective Check (→ Page 128).
Engine Overloaded Contact Service.
Engine speed not steady
Component Probable Cause Task
Fuel injection equip‐
ment
Injector defective Replace (→ Page 78).
Speed sensor Defective Contact Service.
Fuel system Not vented Vent fuel system (→ Page 85).
Engine governor Defective Contact Service.
Charge-air temperature too high
Component Probable Cause Task
Engine coolant Incorrect coolant concentration 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 Probable Cause Task
Air supply Air filter clogged Clean.
Intercooler Contaminated Contact Service.
Exhaust turbocharger Defective Contact Service.
Coolant leaks on intercooler
Component Probable Cause Task
Intercooler Leaking, major coolant discharge Contact Service.
Exhaust gas black
Component Probable Cause Task
Air supply Air filter clogged Clean.
Fuel injection equip‐
ment
Injector defective Replace (→ Page 78).
Engine Overloaded Contact Service.
Exhaust gas blue
Component Probable Cause Task
Engine oil Too much oil in engine Drain engine oil (→ Page 97).
Oil separator of crankcase breather
contaminated
Replace (→ Page 63).
Exhaust turbocharg‐
er, cylinder head, pis‐
ton rings, cylinder lin‐
er
Defective Contact Service.
42 | Troubleshooting | M015675/05E 2011-10
TIM-ID: 0000002541 - 001
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