Engine does not reach nominal speed
Component Probable Cause Task
Fuel supply Fuel supply shut off Open shut-off valve before fuel prefilter
completely.
Fuel prefilter clogged Replace (→ Page 139).
Fuel filter clogged Replace (→ Page 133).
Air supply Air filter clogged Check signal ring position of service in‐
dicator (→ Page 144).
Fuel injection equip‐
ment
Injector defective Replace (→ Page 123).
Injection pump defective Replace (→ Page 120).
Engine wiring Defective Check (→ Page 172).
Engine Overloaded Contact Service.
Engine speed not steady
Component Probable Cause Task
Fuel injection equip‐
ment
Injector defective Replace (→ Page 123).
Injection pump defective Replace (→ Page 119).
Speed sensor Defective Contact Service.
Fuel system Not vented Vent fuel system (→ Page 131).
ECU 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
Check air supply / ventilation ducts.
Charge-air pressure too low
Component Probable Cause Task
Air supply Air filter clogged Check signal ring position of service in‐
dicator (→ Page 144).
Intercooler Contaminated Contact Service.
Exhaust turbocharger Defective Contact Service.
Coolant leaks on intercooler
Component Probable Cause Task
Intercooler Leaking, major coolant discharge. Contact Service.
MS150031/03E 2011-10 | Troubleshooting | 97
TIM-ID: 0000002547 - 001
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