Thread: VSS problem
View Single Post
Old 06-13-2016, 11:28 PM   #8 (permalink)
t vago
MPGuino Supporter
t vago's Avatar
Join Date: Oct 2010
Location: Cedar Rapids, IA
Posts: 1,766

The Karen-Mobile - '05 Dodge Magnum SXT
Team Dodge
90 day: 26.72 mpg (US)

Fiat Dakota - '00 Dodge Dakota SLT RWD Quad Cab
90 day: 16.67 mpg (US)

The Red Sled - '01 Dodge Durango SLT 4WD
90 day: 16.96 mpg (US)
Thanks: 799
Thanked 681 Times in 437 Posts
Originally Posted by mirkwood View Post
Hehe yeah okay, really really high.

Yeah, I just noticed this guy had similar problem
and he was to do a divider aswell, but no conclusion.

Hmm... is this something that can be bought somewhere pre-built?, I tried to do a search, but either i am not using the right words, or then it is rare.

If i am to solder myself then i need a really detailed plan. Soldering no problem, but schematics not my strongest side.
You could get yourself a 4013 dual D flip-flop CMOS chip. It's a fairly basic piece of 1970s technology that should cost around $0.50 per chip. It will accept a car battery or alternator voltage with no problem.

Here's a datasheet for one ->

Get a 14-pin DIP chip, a 14-pin DIP socket for the chip, a 0.1 uf capacitor (preferably not electrolytic), and solder jumper wires as described in the below pin assignments:

10 <-> 8 <-> 7 <-> 6 <-> 4

3 -> 2.2 kohm resistor -> 14
3 -> input Alfa VSS signal
1 -> 11
14 -> V+ (same source wire that powers the MPGuino, for instance)
7 -> ground
14 -> 0.1 uf capacitor -> 7
1 -> 11
13 -> VSS output to MPGuino
2 -> 5
12 -> 9

Originally Posted by mirkwood View Post
In another thread on a Alfa romeo site i found this, but it is an more expensive option.
Universal Speedometer Signal Interface

Where do i see the code version?, on the unit itself?.

Thanks again .
No problem.

The MPGuino version can be found on the screen, for approximately 2 seconds after it is first powered up.
The Fiat Dakota

The Karen-mobile

The Red Sled
  Reply With Quote