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Service Manual
Third edition, June 1997
7. If there is no ground failure on the cable between the
Transmitter and the temperature wire terminal, you
need to check each individual temperature sensor.
8. Remove the wires to the temperature sensor from the
terminal inside the Temperature Connection Box.
9. Measure the resistance between each wire and ground
to find which temperature sensor is causing the ground
failure. Replace troubling temperature sensor with a
new spare sensor ordered from Saab Marine Electronics
or any of the service agents, see list of agents in chapter
12.
9.14.4 Ground Failure – IG Pressure Sensor
10. Remove the wires of the cable to the IG pressure sensor
(if included in system) from the wire terminal inside the
transmitter housing.
11. Hold all the wires of the sensor cable together so that
they are in contact with each other. Measure the resis-
tance to ground, which should be more than 10 MΩ. If
it is, go to step 13 below.
12. If the resistance measured in step 12 is less than 10 MΩ,
replace the IG pressure sensor with a spare sensor. See
chapter 6.4.2.
9.14.5 Ground Failure – Extra Temperature Sensors
13. If there are extra temperature sensors connected (there
can be up to two extra sensors except for the one, two
or three inside the tank) these can also be the cause of a
ground failure. These extra sensors can either be con-
nected to the wire terminal inside the transmitter hous-
ing or the temperature housing. Remove one sensor’s
wires from the terminal and hold them together. Mea-
sure resistance, which should be more than 10 MΩ. If it
is, go to step 15 below.
14. If the resistance measured in step 13 is less than 10 MΩ
replace with new spare sensor.
9.14.6 Ground Failure – Local Display
15. If a Local Display is connected to the Transmitter this
could also be causing ground failure. Remove all the
wires to the Local Display from the terminal inside the
Transmitter Housing.
16. Hold all the wires of the sensor cable together so that
they are in contact with each other. Measure the resis-
tance to ground, which should be more than 10 MΩ. If
it is, go to step 19 below.