Operating instructions

Engine speed not steady
Component Probable Cause Task
Fuel injection equip‐
ment
Injector defective Replace (→ Page 85).
Speed sensor Defective Replace.
Fuel system Not vented Vent fuel system (→ Page 88).
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 100).
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 100).
Fuel injection equip‐
ment
Injector defective Replace (→ Page 85).
Engine Overloaded Contact Service.
Exhaust gas blue
Component Probable Cause Task
Engine oil Too much oil in engine Drain engine oil (→ Page 103).
Oil separator or oil preseparator of
crankcase breather clogged
• Clean preseparator (→ Page 78).
• Replace filter element of oil separa‐
tor (→ Page 79).
Exhaust turbocharg‐
er, cylinder head, pis‐
ton rings, cylinder lin‐
er
Defective Contact Service.
M015650/04E 2012-02 | Troubleshooting | 63
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