Volvo Penta D1-13 Workshop Manual page 26

30-2 Fault Tracing
24
Checking NMEA 2000 Gateway LED
There are two light emitting diodes on the interface.
One is lit when the NMEA bus has power supply. The
other has different lighting options.
Constant lit
The unit is powered up but receives no communication
from any side.
Flashes on-off repeatedly
The unit is receiving and transmitting valid NMEA and
MULTILINK data. Function is correct.
Flashes two strobes and than off repeatedly
Enheten tar emot MULTILINK-data men har ingen
NMEA-anslutning (tar inte emot NMEA velocity-data).
Flashes three strobes and than off repeatedly
The unit is receiving NMEA data but has no MULTI-
LINK connection.
Manual fault tracing of bus cables
Tools:
88890074 Multimeter
NOTICE! Cut the current with the main switch.
It can be difficult to check whether there is a cable fault
in the bus cable when it is installed in the engine. For
this reason, always keep checked bus extension
cables in the fault-tracing equipment. Connect the
extension cable to one end of the boat's bus cable and
run it back to the other end of the bus cable, to allow
each conductor to be checked individually. After this,
all the pins can be checked.
1 Use 88890074 Multimeter to check the bus
cables. The uninsulated parts of the conductors
in the bus cables should not be in contact. Dis-
connect the bus cable at both ends and measure
the resistance between all pins to check for short
circuit between conductors. The multimeter
should show infinite resistance between each pin.
If the resistance is less than infinite, there is a
fault.
2 Do a resistance check through each of the con-
ductors in the cable to detect if there is any open
circuit. Connect one probe to pin1 in one connec-
tor and connect the other probe to pin 1 in the
connector in the other end of the cable (this does
not apply to the Y-split which has a different pin
configuration). The resistance should be approx-
imately 0 ohm. Continue through all pins in the
connector.
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