> > the real solution to all of this is to either find a dealer that has the > vw special tool and actually knows how to use it. or to figure out how > the tool works ie what resistance equals what position on the gauge, and > or what resistance equal what temperature.
I did a little archive dredging a few months back on the subject of the VW1301 tool and came up with the following: VW1301 is apparently a variable resistor device on a 12V input. There are a few mentions of it in the archives. Ken Lewis did a test with a decade resistance box and came up with some numbers, but I think he had the "fuel full" and "fuel empty" numbers reversed. The markings on the VW tool are a German engineering mystery. The proportion seems to be 5:3 in terms of "VW1301 number" : "resistance in ohms". Ken himself even mentioned the 3/5ths thing at the time. What it comes down to is: ("tool" means VW1301 tester dial setting) tool = 50 ----- 35ohms (tank reads full, temp reads hot) tool = 320 ---- 210ohms (tank reads empty) tool = 510 ---- 340ohms (temp gauge reads cold)
-- John Bange '90 Vanagon - "Geldsauger" |
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