Volvo Penta D1-13 Workshop Manual page 22

30-2 Fault Tracing
P0007948
a
6
1
MDI
P0008421
a Engine connector
b Flywheel sensor
a
1
2
3
4
5
6
MDI
P0008422
a Engine connector
b Connector, multilink
20
b
BL / W
1
P
SB
2
b
Y / GR
1 A
Y / GR
2
B
Y / W
3 C
SB
4
D
Y / W
5
E
R
6 F
Multilink fault
Tachometer
No revolution speed is shown in the tachometer/
display. Engine hours might not be visible in the tach-
ometer / display.
Alarm display
None.
Symptom
The button panel will function as normal.
Circuit description
The tachometer and the display recieves information
from the MDI via the multilink bus. Connected to the
multilink is also, if they are used, the multisensor and
the NMEA interface . The multilink contains of two pairs
of CAN communiction wires and supply voltage. To be
able to present engine revolution a flywheel sensor is
used. The flywheel sensor is an inductive sensor. The
MDI uses the sensor signal to calculate the flywheel
speed which presents in the tachometer. The flywheel
input in the MDI is at pin 2 and pin 3 in the engine
interface connector.
A CAN L
B CAN L
C CAN H
D Power supply negative
E CAN H
F Power supply positive
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