Urgent! Where can I find RPM signal / speed Signal?

[Jonas_R]

Anybody that knows where I can get the RPM signal Speed signal from?

I was hoping that I could get it somewhere in the instrument cluster?

Cheers

Jonas

[S2central.net]

Its there alright - follow S2central thru the cluster part of the technical chapter - there are pinouts of the various connectors. I'll have a look if you can't find what you need.

[S2central.net]

Ohhh whoops - the pinout schematic is here, but not linked properly at the moment. Sorry - http://s2central.net/autocheck_pinout.html

Paul

[Casper...]

Try Paul (S2central.net) he has the wiring diagrams for a 3B...
It also to possible take signal at the sensor...

Casper...

[S2central.net]

That page is flakey somehow - you'll find what you need on pin 22 (twenty-two) of the yellow 26-pin connector on the cluster. With a meter you can trace that connection to the pins on the rear of the tacho... Up to you how best you need to make the connection.

WHat are you wiring up out of interest ?

Don't forget that many 3rd party devices do not understand 5-cyl rpm signal.

[Jonas_R]

Hi Paul,

After looking through your papers and me Bently manual etc. I came to the conclusion that I needed the VVS signal? Located on Pin 18 on connector 26A, perhaps I was mistaken there?

Anyways I need it for my Cruise Control and for my Zeitronix datalogger

Want to start it up tomorrow to see how it works, but it does seem that I need to wait a couple of days since it is snowing right now and I dont fancy going 200km/t+ in this weather

Cheers

Jonas

[S2central.net]

VSS you mean - that is vehicle speed signal - commonly found as white/blue cable across much of the loom - behind cluster, centre console, ABS, Cruise, difflock etc etc

VSS tells us how fast the car is moving - surely the Zeitronix cannot understand that signal ?

Zeitronix could make sense of engine RPM if it can cater for 5-cyl engine (think it does)


Paul

[Audibits]

Anybody that knows where I can get the RPM signal Speed signal from?

I was hoping that I could get it somewhere in the instrument cluster?

Cheers

Jonas

rpm speed sensor is on the gearbox bell housing on the right as you look into the engine bay

[S2central.net]

Yeah buts that only meaningful to an ECU a millivolt sawtooth waveform... The ECU reformats the signal into 'line level' that a rev counter understands.

[andyg plym]

i think it could be the blue and green wire in the back of the cluster,i took that as a feed for my shift lights which need rpm signal
hth

[slow2]

Anybody that knows where I can get the RPM signal Speed signal from?

I was hoping that I could get it somewhere in the instrument cluster?

Cheers

Jonas

When I'm looking for signal outputs I tap into wiring near the ECU plug, that way
you can tell which wires carry what signals, start by looking on here,

https://www.s2-audi.co.uk/tech_articles/motronic/ecu.htm

Pin nunber 6 for 3B or pin number 40 for ABY give you RPM (tachometer) signal,
you can feed you zietronix with the rpm output from this.

[Jonas_R]

Thanks alot guys

Weather is looking good to day so perhaps I can do some test runs.

[Bowlerwell]

ok, i'm gonna be putting in my cruise control over the next couple of weeks... Just to confirm, is it the RPM (Tacho) signal, or the VSS signal that I want?

[Jonas_R]

Iam pretty sure that you need the VSS for the Cruise control.

[Faheemo]

When I'm looking for signal outputs I tap into wiring near the ECU plug, that way
you can tell which wires carry what signals, start by looking on here,

https://www.s2-audi.co.uk/tech_articles/motronic/ecu.htm

Pin nunber 6 for 3B or pin number 40 for ABY give you RPM (tachometer) signal,
you can feed you zietronix with the rpm output from this.

Correct i've tapped into this wire off the ECU to run my Zeitronix.
Yes Zeitronix understands 5cyl - gotta set it up in the software menu.