[urq] Mine will not read full : anyone have a fuel guage?

[Louis-Alain Richard]

Addendum to my own post:

The resistance values of the VAG1301 are not true ohms values, as per
this page (look at the bottom for a chart)
http://www.bentleypublishers.com/tech/vw/bentley.vw1301.testing.htm?tick
et=none 
I've plotted the data from this page to obtain a graph of the
relationship between VAG1301 and real values.

Hence, to test the fuel gauge circuit, you must use these real ohms
values :

		Real value		VAG1301 values
Full tank	39 ohms		60
Half tank	88 ohms		155
Reserve	159 ohms		302

It all makes sense, because I've already tried the VAG1301 values and my
fuel gauge wasn't even near the corresponding marks. So all you need is
a 40 ohms resistance and place it between the 2 wires at the sending
unit and your gauge should read FULL. If yes, replace the sending unit,
if not check elsewhere.

Louis-Alain

 

> -----Message d'origine-----
 
> And if you don't have a Bentley, you can look at these scans of the
> official WR shop manual...
> 
> http://www.wrquattro.com/info_data.html 
> 
> Fuel gauge testing is at page 127
> (http://www.wrquattro.com/QuattroManual/QuattroManual131.jpg) 
> and IC voltage regulator at page 126
> (http://www.wrquattro.com/QuattroManual/QuattroManual130.jpg). 
> 
> Louis-Alain