Fault-Tracing - Volvo Penta D12-615 Operator's Manual

In case of emergency

Fault-tracing

A number of symptoms and possible causes of engine malfunctions are described in the table below. Always con-
tact your Volvo Penta dealer if problems occur which you can not solve by yourself.
WARNING! Read through the safety advice for care and maintenance work in the "Safety information" chap-
ter before starting work.
Symptoms and possible causes
The diagnosis button lamp flashes.
Engine can not be stopped
Starter motor does not rotate
Starter motor rotates slowly
Starter motor rotates normally but engine does not start
Engine starts but stops again
Engine does not reach full operating speed at full throttle
Engine runs unevenly
Engine vibrates
High fuel consumption
Black exhaust smoke
Blue or white exhaust smoke
Lubrication oil pressure too low
Coolant temperature too high
Coolant temperature too low
No charge or poor charge
1. Flat batteries
2. Poor contact/open circuit in cables
3. Main switch turned off
4. One of the circuit breakers in the dis-
tribution box has tripped.
5. Faulty key switch
6. Control lever not in neutral/control po-
sition not activated
7. Faulty stop relay
8. Faulty main relay
9. Faulty starter relay
10. Faulty starter motor relay
11. Faulty starter motor/solenoid
12. Lack of fuel:
– fuel taps closed
– fuel tank empty/wrong tank con-
nected
13. Blocked fine fuel filter/pre-filter
(caused by contamination or fuel
stratification at low temperature)
36
14. Air in the fuel system
15. Water/contamination in fuel
16. Boat abnormally loaded
17. Fouling on hull/propeller
18. Faulty injectors (nozzles)
19. Insufficient air supply to engine:
– blocked air filter
– air leakage between turbocharger
and engine inlet pipe.
– fouled compressor section in turbo-
charger
– faulty turbocharger
– poor engine bay ventilation
20. Excessive coolant temperature
21. Too low coolant temperature
22. Too low oil level
23. Faulty / wrong propeller
24. Faulty engine mounting
25. Coolant level too low
Please refer to the "Diagnostic information"
chapter.
2, 4, 5, 7
1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 36, 38, 39
1, 2
12, 13, 14, 15, 38
12, 13, 14, 15, 19, 38
13, 14, 15, 16, 17, 18, 19, 20, 23, 33, 37, 38
14, 15
24
16, 17, 21
19
20, 21, 34
22
25, 26, 27, 28, 29, 30, 31, 32
31
2, 35
26. Air in the freshwater system
27. Faulty circulation pump
28. Closed seawater inlet
29. Blocked seawater inlet/pipe/filter
30. Defective impeller in seawater pump
31. Defective thermostat
32. Blocked heat exchanger insert
33. Blocked aftercooler
34. Too high oil level
35. Alternator drive belt slips
36. Water entry into engine
37. High back pressure in exhaust system
38. Stored fault codes*
39. Check that the emergency stop but-
ton is in the running position (not
pressed down).
* Note. Please refer to the "Diagnostic in-
formation" chapter. for further information.