question

luphi avatar image
luphi asked

Fiat Ducato fuel tank sensor to Cerbo

All,


from https://www.ducatoschrauber.de/tankgeber-tuning-ducato-250/ (german page) I noticed, that the original Ducato tank level sensor is meassuring between 100 and 300 Ohm. Might it be possible to connect it in parrallel also to the Cerbo so that the single sensor will support both, car and Cerbo?


Cheers,

luphi

tank monitor
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5 Answers
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

1. The Cerbo measures 0-180 Ohm (EU standard) OR 240-30 Ohm (US standard)

2. Connecting one sensor to two measuring devices will properly distort the measuring.

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luphi avatar image
luphi answered ·

Hello Matthias,


1. the Cerbo is able to meassure between 0 and 300 Ohm.

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2. To meassure resistance, the meassuring device should have a very high internal resistance (should be valid for the car and the Cerbo)

So, yes, they will have an influence on each other but maybe it's not too much or can be compensated.


If it is not harmfull, I would give it a try.


Cheers,

Martin


capture.png (19.9 KiB)
1 comment
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1. Habe mir das Menü nie so richtig angeschaut, da ich selbst noch keine Tanksensoren verbaut habe, kenne daher nur das was im Datenblatt/Handbuch steht.

2. Wenn ich jetzt nicht völlig auf dem Schlauch stehe, wird zum Widerstand messen doch eine Spannung angelegt und der Stromfluss gemessen. Wenn jetzt zwei Messgeräte unterschiedliche Spannungen anlegen, wird das doch zwangsläufig zu Fehlmessungen führen.
Aber da bin ich zu wenig in der Messelektronik drin um das mit Sicherheit sagen zu können.

In modernen Autos läuft ja alles über den Can-Bus und da können auch scheinbar kleine Eingriffe schon zu Fehlermeldungen führen.

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luphi avatar image
luphi answered ·

Da hast du wohl Recht. Wenn mit unterschiedlichen Spannungen gemessen wird, könnte das tatsächlich schlecht ausgehen. Danke für den Hinweis.


Gruß,

luphi

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kevgermany avatar image
kevgermany answered ·

An idea for you to explore.

Read the original values from the vehicle can bus and use these. Probably better to ask a new question in the modifications space to see if anyone has done it or knows how to do it. Might be some programming involved.


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luphi avatar image
luphi answered ·

Hello kevgermany,


thank you for the hint, will do.


Cheers,

luphi

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If you manage to read the CAN of the Ducato please report back as this is high on my whislist!! ;-)

I looked into CarPi and similar projects, but dechiphering the CAN buses spread over multiple ECUs seems to need a lot of backwards engineering ....:-(

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