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
