46
Touble Shooting
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 which you cannot solve by yourself.
WARNING!
Read the safety precautions for maintenance and service in the chapter “Safety precautions” be-
fore starting work.
The diagnosis button lamp flashes
Refer to the “Diagnostic information” chapter
Engine cannot be stopped
2, 4
Starter motor does not rotate
1, 2, 3, 4, 5, 6, 7, 24
Starter motor rotates slowly
1, 2
Starter motor rotates normally but engine does not start
8, 9, 10, 11
Engine starts but stops again
8, 9, 10, 11, 13
Engine does not reach correct operating rpm at full throttle
9, 10, 11, 12, 13, 21, 25, 26
Engine runs roughly
10, 11, 27
High fuel consumption
12, 13, 15, 25
Black exhaust smoke
12, 13
Blue or white exhaust smoke
14, 15, 22
Lubrication oil pressure too low
16
Coolant temperature too high
17, 18, 19, 20
Coolant temperature too low
20
No, or poor charge
2, 23
1. Discharged batteries
2. Poor contact/open circuit in
electrical cable
3. Main switch turned off
4. Faulty ignition lock
5. Faulty main relay
6. Faulty starter motor relay
7. Faulty starter motor/solenoid
8. No fuel:
– fuel cocks closed
– fuel tank empty/wrong tank
connected
9. Blocked fuel filter/pre-filter
(because of contamination, or
paraffin fraction separation in
fuel at low temperature)
10. Air in the fuel system
11. Water/contamination in fuel
12. Faulty injection pumps
13. Insufficient air supply to the
engine:
– clogged air filter
– air leakage between the turbo
and the engine’s intake pipe
– dirty compressor part in the
turbocharger
– faulty turbocharger
– poor engine room ventilation
14. Coolant temperature too high
15. Coolant temperature too low
16. Oil level too low
17. Coolant level too low
Symptoms and possible causes
18. Air in the coolant system
19. Faulty circulating pump
20. Defective thermostat
21. Blocked charge air cooler
22. Oil level too high
23. Alternator drive belt slips
24. Water entry into engine
25. High back pressure in exhaust
system
26. Break in “Pot+” cable to pedal
27. Faulty adjustment, engine
speed regulator/actuator
Summary of Contents for TAD734GE
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