5–02 Troubleshooting
Engine does not reach nominal speed
Component Probable Cause
Task
Fuel prefilter clogged Replace (→ Page 6 – 32).Fuel supply
Fuel filter clogged Replace (→ Page 6 – 25).
Air supply Air filter clogged Check signal ring position of service
indicator (→ Page 6 – 37).
Injector defective Replace (→ Page 6 – 18).Fuel injection equipment
Injection pump defective Replace (→ Page 6 – 15).
Engine wiring Defective Check (→ Page 6 – 62).
Engine Overloaded Contact Service.
Engine speed not steady
Component Probable Cause
Task
Injector defective Replace (→ Page 6 – 18).Fuel injection equipment
Injection pump defective Replace (→ Page 6 – 15).
Speed sensor Defective Contact S ervice.
Fuel system Not vented Vent fuel system (→ Page 6 – 23).
ECU Defective Contact Service.
Charge-air temperature too high
Component Probable Cause
Task
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 Check signal ring position of service
indicator (→ Page 6 – 37).
Intercooler Contaminated Contact Service.
Exhaust turbocharger Defective Contact Service.
M015560/00E 03-05 ©MTU
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