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■ Engine rattling, noisy engine
•Compensation of individual injector not
adapted
•Low compression pressure
•No rail pressure sensor signal
•Poor injector O-ring
■ Uneven acceleration / deceleration
•Intermittent faulty fuel line connection
•No rail pressure sensor signal
•Leakage in intake system
•Clogged fuel filter
•Leakage in high pressure fuel circuit
■ Engine stop
•Run out of fuel / Safety Stop Switch activated
•Fuel feed line not connected
•Leakage in high pressure fuel circuit
•Fuel out of specification
•Bad fuel quality or water in fuel
•Clogged low pressure fuel circuit
■ Performance loss
•Compensation of individual injector not
adapted
•Clogged air filter
•Oil level too high or too low
•Damaged turbocharger or intake air leakage
•Clogged fuel filter
INSTALLATION & OPERATION MANUAL
U125 Series Engines
Possible Causes
Possible Causes
Possible Causes
Possible Causes
•No engine coolant temperature sensor signal
•Clogged injector return line
•Faulty injector
•Carbon deposit on the injector
•Oil suction
•ECU program error or hardware fault
•Damaged turbocharger or leakage in vacuum
line
•Low compression pressure
•Injector needle stuck
•Crank signals missing
•Fuel pressure regulator valve contaminated,
stuck, jammed
•Rail pressure regulator valve contaminated,
stuck, jammed
•Faulty alternator or voltage regulator
•Faulty high/low pressure fuel pump
•ECU program error or hardware fault
•Leakage at the injector
•Fuel or intake air temperature too high
•Engine coolant temperature too high
•Low compression pressure
•Poor valve clearance
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