Engine does not reach nominal speed
Cause
Corrective action
Fuel prefilter clogged
u
Easy-change fuel filter clogged
u
Air supply: Air filter clogged
u
Check signal ring position of service indicator (→ Page 132).
Fuel injection: Injector defective
u
Engine cabling defective
u
Engine: Overload
u
Contact Service.
Engine speed not steady
Cause
Corrective action
Fuel injection: Injector defective
u
Speed transmitter defective
u
Contact Service.
Air in fuel system
u
Vent fuel system (→ Page 115).
Engine Control Unit defective
u
Contact Service.
Charge-air temperature too high
Cause
Corrective action
Incorrect coolant concentration
u
Check (MTU test kit).
Charge-air cooler clogged
u
Contact Service.
Engine room: Air-intake
temperature too high
u
Check fans and air supply/ventilation ducts.
Charge-air pressure too low
Cause
Corrective action
Air supply: Air filter clogged
u
Check signal ring position of service indicator (→ Page 132).
Charge-air cooler contaminated
u
Contact Service.
Exhaust turbocharger defective
u
Contact Service.
Coolant leaks at charge-air cooler
Cause
Corrective action
Charge-air cooler leaking, major
coolant discharge
u
Contact Service.
Black exhaust gas
Cause
Corrective action
Air supply: Air filter clogged
u
Check signal ring position of service indicator (→ Page 132).
Fuel injection: Injector defective
u
Engine: Overload
u
Contact Service.
64 | Troubleshooting | M015650/06E 2018-05
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