30
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 any problems occur that you cannot solve yourself.
WARNING!
Read through the safety instructions for care and service in chapter “Safety information” before
you start working.
Symptoms and possible causes
The Diagnostic button tell-tale lamp flashes
Refer to chapter “Diagnostics information”.
The engine cannot be shut off.
2, 5
The starter motor is not working
1, 2, 3, 4, 5, 6, 7, 24
The starter motor runs slowly
1, 2
The starter motor runs normally, but the engine does not start
8, 9, 10, 11
Engine starts, but stops again
8, 9, 10, 11, 13
The engine does not reach the correct operational speed
at full throttle
9, 10, 11, 12, 13, 21, 25, 26
Engine runs roughly
10, 11
High fuel consumption
12, 13, 15, 25
Black exhaust smoke
12, 13
Blue or white exhaust smoke
15, 22
Lubrication oil pressure too low
16
Coolant temperature too high
17, 18, 19, 20
Coolant temperature too low
20
No, or low charge
2, 23
1.
Flat batteries
2.
Poor contact/open circuit in ca-
bles
3.
Main switch turned off.
4.
Main automatic breaker defec-
tive
5.
Defective ignition switch
6.
Defective main relay
7.
Defective starter motor/sole-
noid valve
8.
Fuel shortage:
– fuel taps closed
– fuel tank empty/faulty tank
connection
9.
Blocked secondary fuel filter/
primary filter (due to contami-
nation, separation due to low
fuel level
10. Air in the fuel system
11. Water/contamination in fuel
12. Faulty injector
13. Insufficient air supply to
engine:
– blocked air filter
– air leak between turbo and in-
let manifold
– coked-up compressor parts
in the turbocharger
– defective turbocharger
– poor ventilation in engine bay
14. Coolant temperature too high
15. Coolant temperature too low
16. Too low oil level
17. Coolant level too low
18. Air in cooling system
19. Defective circulation pump
20. Defective thermostat
21. Blocked charge air cooler
22. Oil level too high
23. Alternator drive belt slips
24. Water entry in engine
25. High back pressure in exhaust
system
26. Open circuit in “Pot+” cable to
pedal
Fault tracing
Summary of Contents for TAD734GE
Page 1: ...EMS 2 Industrial engines TAD734GE Installation 1 1 I ...
Page 2: ......
Page 13: ...General information 11 Wiring diagram EMS 2 engine cable harness ...
Page 45: ...43 References to Service bulletins Group No Date Concerning ...
Page 46: ... Notes ...
Page 48: ...7747352 English 10 2009 ...