Fiat ducato2.8 motorhome
Fiats have a reputation for electrical/electronic problems as they age and even when they are not very old they can manage strange things that even sometimes defeat the dealers, though the same can be said of many modern vehicles. I used to look after a Ducato motorhome and fortunately didn't need to get involved with much electrical work - the only faults were caused by the coachbuilders rushing around and being careless and not by Fiat.
I am not sure if the temp gauge is driven by the engine management or is a traditional circuit but either way the temperature gauge is in effect a voltmeter of sorts. Assuming the gauge is ok, the reading will only fluctuate if the voltage in the circuit fluctuates and that could mean the supply voltage is fluctuating or the resistance of the ground path is fluctuating.
With the traditional circuit the gauge is supplied by an electronically stabilised voltage and the ground path resistance is varied by the engine coolant temperature sensor and fluctuations could be anything from a faulty instrument voltage regulator, through faulty wiring or connections to the temperature actually fluctuating.
If the gauge is driven by the engine management the same approximately applies but checking the circuit becomes much more complex due to the need for circuit diagrams and specialised test equipment, though these would not be needed just to check the security of the gauge in the printed circuit of the instrument panel.
http://schematicsdiagram.blogspot.com/2011/12/fuel-gauge-jumps-from-empty-to-full.html
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Oldsmobile Temperature Gauge Lamp Switch?
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http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html
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http://schematicsdiagram.blogspot.com/2011/12/temperature-gauge-went-up.html
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http://repairhelpcenter.blogspot.in/2012/02/how-to-replace-instrument-panel-and.html
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http://technoanswers.blogspot.in/2012/02/how-to-remove-instrument-panel-on.html
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If
all voltages checked ok, then most probably its faulty instrument cluster board
on which gauges are connected. Yes if cluster circuit board looks ok, then also
it can be faulty. Somewhere there is minute short or burn on board then such
problem arises.
Also
check the fuse box. One under hood and other under dash.
Inspect
each and every fuse and see if all are fine or not.
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For
more troubleshooting on these cluster gauges I suggest you to refer the list of
help links mentioned below. Its step by step instructions will help you to
confirm the exact cause of problem in these conditions: ---------
Click
the link below: ------
2004 Toyota Tundra:
Oil Gauge and Temp Gauge Not Working?
http://howtobyme.blogspot.in/2012/05/2004-toyota-tundra-oil-gauge-and-temp.html
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2005 Lexus SC430: Fuel Door, Dome light and Fuel Gauge Fuse
Location?
http://howtobyme.blogspot.in/2012/05/2005-lexus-sc430-fuel-door-will-not.html
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Toyota 4Runner:
Temperature Gauge Sensor
http://technoanswers.blogspot.in/2012/04/toyota-4runner-temperature-gauge-sensor.html
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Temperature gauge sits over half way mark?
http://schematicsdiagram.blogspot.in/2012/04/temperature-gauge-sits-over-half-way.html
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Heater blows intermittently and temp gauge goes erratic?
http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html
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Temperature gauge does not move and no heat when heater is
ON?
http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html
-----------
2003 Pontiac
Grand Prix: Erratic Fuel Gauge?
http://technoanswers.blogspot.in/2012/06/2003-pontiac-grand-prix-erratic-fuel.html
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Temperature gauge keeps fluctuating up and down close to
red?
http://technoanswers.blogspot.com/2012/01/temperature-gauge-keeps-fluctuating-up.html
-------------
Temperature gauge on the dash quit working on Pontiac Grand
Prix?
http://technoanswers.blogspot.com/2012/01/temperature-gauge-on-dash-quit-working.html
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Fuel gauge jumps from empty to full?
http://schematicsdiagram.blogspot.com/2011/12/fuel-gauge-jumps-from-empty-to-full.html
--------------
Gas gauge stuck on empty on 2002 Mercedes Benz 240c?
http://repairhelpcenter.blogspot.in/2012/02/gas-gauge-stuck-on-empty-on-2002.html
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• Oldsmobile
Temperature Gauge Lamp Switch?
-----------------
Fuel gauge drops to Empty?
http://technoanswers.blogspot.com/2012/01/fuel-gauge-drops-to-empty.html
----------------
Dodge neon gauges not working?
http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html
------------
Temperature gauge went up?
http://schematicsdiagram.blogspot.com/2011/12/temperature-gauge-went-up.html
------------
Temperature gauge stays At cold on jaguar?
http://technoanswers.blogspot.in/2012/02/temperature-gauge-stays-at-cold-on.html
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How to replace Instrument panel and dashboard on Toyota
car?
http://repairhelpcenter.blogspot.in/2012/02/how-to-replace-instrument-panel-and.html
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How to remove instrument panel on Chevrolet car?
http://technoanswers.blogspot.in/2012/02/how-to-remove-instrument-panel-on.html
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How to remove control panel on Buick regal?
http://howtobyme.blogspot.in/2012/02/how-to-remove-control-panel-on-buick.html
---------------
These
details will help.
Thanks.
http://howtobyme.blogspot.in/2012/05/2004-toyota-tundra-oil-gauge-and-temp.html
---------
Toyota 4Runner: Temperature Gauge Sensor
http://technoanswers.blogspot.in/2012/04/toyota-4runner-temperature-gauge-sensor.html
-----------
Temperature gauge sits over half way mark?
http://schematicsdiagram.blogspot.in/2012/04/temperature-gauge-sits-over-half-way.html
----------
Heater blows intermittently and temp gauge goes erratic?
http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html
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No heat on Oldsmobile Silhouette?
http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html
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Temperature gauge does not move and no heat when heater is ON?
http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html
----------
Temperature gauge keeps fluctuating up and down close to red?
http://technoanswers.blogspot.com/2012/01/temperature-gauge-keeps-fluctuating-up.html
-----------
Temperature gauge on the dash quit working on Pontiac Grand
Prix?
http://technoanswers.blogspot.com/2012/01/temperature-gauge-on-dash-quit-working.html
-----------
Dodge neon gauges not working?
http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html
---------
Heater blows cold?
http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html
----------
Heat blows cold on drivers side and hot on
passenger side?
http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html
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1992 Lexus LS400: Engine overheats,
Antifreeze out of reservoir and heater Blows Cold Air?
http://whatisbyme.blogspot.in/2012/05/1992-lexus-ls400-engine-overheats.html
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These details will help.
Thanks.
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