Volvo Penta D1-13 Workshop Manual page 13

P0008396
47704383 06-2013 © AB VOLVO PENTA
MDI gauge checks
Tools:
88890074 Multimeter
The gauges are of Easy-Link type and receive their
signals via a serial bus. The instrument cables com-
prise three wires: battery positive, battery negative and
a databus.
If a fault occurs in the instrument Easy Link bus, it can
be detected by the gauge needles stopping in the
T
E A
E H
P R
same position on the instruments (they "freeze"). If
T
A R
S T
T T
none of the gauges function, check using
B A
88890074 Multimeter that there is +12 V between the
red (pin 1) and blue (pin 2) wires in the Easy link har-
ness.
Since shared signals from various types of gauges
pass through the same cable, it is difficult to determine
whether information is lacking from the serial bus, or if
an individual gauge is faulty. If an instrument fault is
suspected, use the following procedure to determine
whether the gauges are faulty or not.
1
2
3
Start the engine and let it idle with the control lever
in the neutral position.
Disconnect the gauge that is suspected of being
faulty.
The fault disappears
- Check that there is no oxide or moisture in
the connectors to the gauge concerned.
- Change the disconnected gauge and check
if the fault is still absent when the new gauge
is connected.
The fault remains
Continue to disconnect gauges until gauge dis-
plays are correct. Then attempt to connect the
gauges again. Begin with the gauge that was dis-
connected first and continue to connect the
gauges that were disconnected until the indication
is no longer shown. Change the gauge connected
last.
30-0 General
11