Engine speed not steady
Component Probable Cause Task
Fuel injection equip‐
ment
Injector defective Replace (→ Page 79).
Speed sensor Defective Replace.
Fuel system Not vented Vent fuel system (→ Page 82).
ECU Defective Contact Service.
Charge-air temperature too high
Component Probable Cause Task
Engine coolant Incorrect coolant concentration Check.
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 Check signal ring position of service in‐
dicator (→ Page 94).
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 Check signal ring position of service in‐
dicator (→ Page 94).
Fuel injection equip‐
ment
Injector defective Replace (→ Page 79).
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 or oil preseparator of
crankcase breather clogged
• Clean preseparator (→ Page 72).
• Replace filter element of oil separa‐
tor (→ Page 73).
Exhaust turbocharg‐
er, cylinder head, pis‐
ton rings, cylinder lin‐
er
Defective Contact Service.
56 | Troubleshooting | MS150062/01E 2012-01
TIM-ID: 0000002555 - 002
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