257
OXE 150/200 HP SERVICE MANUAL
TROUBLESHOOTING
x = likely to apply
o = might apply
2.
Starter motor turns over engine slowly or not at all
1.
ECU self-diagnosis
3.
Starter motor turns, engine fails to start, engine fails to start / difficult to start when cold
4.
Engine stalls (dies) during operation, no longer starts (starter motor turns),
engine fails to start / difficult to start when hot
5.
Sudden, temporary engine shutdown, engine does not reach full revs
6.
Engine runs at idle speed only, no throttle response
7.
Engine runs at increased idle speed only, no throttle response
8.
Rated engine speed significantly reduced (even at no load)
9.
Reduced power output in all ranges
10. Irregular engine operation, loss of traction
11. Unstable idle speed, engine surges, misfiring, engine knocking
12. Engine judder
13. Unusual combustion noises
14. Excessive smoke emission: white smoke / blue smoke
15. Excessive smoke emission: black smoke
16. Engine temperature too high (coolant loss)
17. Fuel consumption too high
18. Lubrication oil pressure too low
19. Lube oil pressure too high
20. Lube oil consumption too high
21. Engine too “loud” / mechanical noises
Possible causes
x x x
x x
x
x
Fuel low pressure system: Air in system (turn on ignition when bleeding system)
x x x
x x x x
x
Fuel low pressure system: Feed pump, main filter
x
x
x x x o x
x
Fuel high pressure system: Injectors defective / clogged / leaking / coked
x
x x x
o
x
x
o x x x x
o
Fuel high pressure system: High-pressure pump worn
x
x o
ECU rpm sensor, polarity reversed
x
x x x o
o o
o
ECU detects incorrect engine speed (interference signal on rpm sensor lead)
x
x
x
ECU boost pressure sensor: faulty, incorrect, implausible with atmospheric pres-
sure sensor, line fault
x
x
o x
Exhaust turbocharger leaking or defective
x
Turbine and compressor wheel in the turbocharger soiled (running off balance)
x
Intercooler leaking, defective
x
o
x x
o
x
ECU coolant temperature sensor: faulty, line fault
x
x x
ECU charge-air temperature sensor: faulty, line fault
o
x
x
Heat exchanger fouled or failure of cooling system (temperatures too high)
x
Coolant level too low, air in the coolant circuit
x
x
Incorrect belt tension
x
Coolant pump leaking, defective / thermostat defective, does not open
x
Coolant lines leaking, blocked or twisted
x
Coolant entering combustion chamber (cylinder head / gasket leaking)
x
x x o
o
Power supply to ECU control unit interrupted or battery voltage too low
x
x
Thermostat defective
x
Engine bearings worn
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