First: what outputs are you looking for?

If I look at the schematics for 1999 (mine) and a 2001, they're (in this part) similar. If the picture below is anything to go by, then I have no idea what 2L is supposed to do and 3J is just another ground wire.

 

Im looking for a (5V) square wave signal which represents the speed (4000 pulses = 1 driven mile).

The VSS is "directly" connected to the cluster which outputs a converted square wave. This square wave is passed to the PCM.

But 2L does not output anything for me.

 

Thinking about this, I realized that the VSS output from the gearbox will represent a fixed number of pulses per driven mile. If that is transmitted into the external wiring system (e.g. to engine management) then I don't know where. As I read it (link to full schematic attached), then the VSS signal is only used internally on the dash)



The signal that comes from 2L and goes to the PCM and Cruise Control module (mine came with one) is a tach signal. The CC mine came with was badly spliced into the 2L wire using that signal to maintain whatever rev you're at at them time of engaging.

2L is a tach output as mentioned above.

I think the easiest solution is getting the Speeduino VR conditioner mentioned above and connect it to the VSS in parallel with the dash. That'll give a square signal with a fixed number of pulses per driven mile (as per the standard VSS output).

If you don't already have it, the full diagram for 2000 models is here: https://mega.nz/file/Z05SnRzA#AJ7835...e3a0AidM7s-FA8

 

You are probably right but there is one problem: I live in germany and either the shipping fees are >70€ or they dont ship at all. If I want to print the board "myself" the MAX9926UAEE+ has a shortage and is currently not available... Thats a big problem for me -.-

The only board I could buy for 32€ (including shipping) is this board. But for me it looks like it couldnt handle the output of the VR Sensor. I read that it can output up top +-50V. What do you think? Could this board work?

 

That should work just the same as the Speeduino one. All the VR conditioner boards are using the same MAX9926 chip anyway, so whether you buy from Boss Garage, DIY-EFI, AliExpress or something similar - it should do the trick. You'll need a 5v power supply for the board - and while you could use something simple like a LM7805, I went with a small switching power supply from RS Components: Switching regulator, Indgang: 6.5 → 36V dc, Udgang: 5V dc, Udgangsstrøm: 500mA | RS (rs-online.com) - much much better than the LM7805.

I sandwiched everything together between a test board and a piece of CF. It was a quick and dirty and will be rectified when i replace the Sinco dash shortly. Still haven't had any issues though ( :

 

Alright thank you very much.
Im printing a selfmade PCB for my projekt anyway so I think I will put a voltage regulator on it because I need the 5V for other circuits too!
Appreciate it!

 

Another bump from the dead: I noticed that with the clutch in and the vehicle moving, the RPM's stick around 900ish. Less than a thousand, but not idle. When the car comes to a rest, about a second later the RPM drops to idle (800ish give or take). I am trying to wrap my head around it as I am not to familiar with oscilloscopes and what they read out. This is noticeable when the AC/Radio/Lights/etc are off, like a midday cruise scenario. Is there a solenoid that the ECU sends a signal to to keep the idle slightly high until the VSS outputs the 0MPH signal? Or is the ECU doing some logic inside to artificially raise the idle?