Volvo Penta D1-13 Workshop Manual page 23

47704383 06-2013 © AB VOLVO PENTA
Fault tracing
Fault condition 1
The tachometer shows engine hours but not engine
revolution due to that no flywheel speed signal is avail-
able.
Possible reason
Fault in the flywheel sensor cable between the MDI
•
and the sensor.
Incorrectly mounted sensor (incorrect distance to
•
flywheel, or loose sensor).
• Electrical interference on engine speed signal.
• Faulty flywheel sensor.
• Damaged flywheel.
Suitable action
1 Check the cables and the connectors between the
engine connector at the MDI and the flywheel sen-
sor.
2 Check that the flywheel sensor is correctly installed
and that no swarf has collected on the sensor.
3 Check the function of the flywheel sensor.
Fault condition 2
The tachometer and/or the display shows neither
engine hours nor engine revolution and easy link
instruments does not work. If fault in multilink CAN
communication the display shows "Connection lost".
Possible reason
• Open circuit in multilink bus or multilink supply.
• Short circuit in multilink bus or multilink supply.
• Faulty tachometer/optional equipment such as dis-
play, NMEA interface, multi sensor.
Suitable action
1 Check multlink bus and connectors between the
multlink connector at the MDI and all connected
optional equipment such as display, NMEA inter-
face, multi sensor.
2 Try with another tachometer/optional equipment.
30-2 Fault Tracing
21