I have just received my data logger, which basically samples various environmental variables that can be downloaded for analysis on a PC.

By default I get precise geo-referenciation, speed, 2-axis acceleration, rpm, and time stamp every 1/100th of a second.

There are extra inputs for digital and analogue signals. A couple of additional things I would like to capture are throttle, brake pedal position and ABS activation.

The analogue signals have ranges of 0-5V or 0-12V. The digital input is programmable between >0 and 14V.

I was planning to use the analogue inputs for brake and throttle and the digital input for ABS.

Any ideas on where I could tap into to get these signals? If not available, how hard would it be to wire something custom? Any suggestions?

TIA.


PS.
If you are curious this is the data logger in question: http://www.race-technology.com/WebPage/Pro...r/DL90Home.html

 

While you guys think about that one does anyone know if the 2000-2002 S2000 Electrical Troubleshooting Manual would answer my questions, ie. does it detail pinouts and diagramatics?

 

The electrical troubleshooting manual shows every wire in the car, with color codes, connector pin-outs, and locations of all the modules and splice connectors in the car. In some rare cases, it does not tell you what the wire is for, instead using some cryptic terminology like "circuit 095", and I can' t find where that is referenced elsewhere in the book. But in 98% of the cases, it will have what you need.

The regular shop manual is where troubleshooting information exists, and where you can get a clue as to what voltages are usually present on the wire, because they will tell you how to test it by measureing voltage or resistance in many cases.

I don't have time right now to look your stuff up, maybe later if no one else helps you before I get back to the PC. BTW - how much is a data logger like that cost?

 

Thanks modifry... and I'll take your offer I'm not in a hurry. But anyway, where are the other electronic engineers... ?

Another quick question. I'm unsure about where to attach the rpm line. No HT lead for us, so I'll try the tacho rpm line. I suspect I may have a problem with the logger sampling rate. So may be the ECM coil output would be a better bet. Any suggestions? Here is some background stuff if any philantropic soul wants to help...

DL90 manual:




S2000 book:





TIA.


BTW the unit cost me incl. shipping and tax 415

 

I would not recommend using a HT (high-tension) lead for the tach input. Here's a list of some connections:

Throttle position - red/black C27 on ECM
Speed sensor - Blue/white A9 on ECM
Tach - Blue A19 on ECM
MAP senosr - Green/red C17 on ECM
Brake pedal - white/black A32 on ECM
VTEC - Green/yellow B12 on ECM

I'm not sure about the ABS, don't know too much about how it works, but you might try the light blue wire on the ABS unit, terminal 10.

Here's a pic of the ECM connectors, you should download it because it won't stay in my photo album for long.

 

Thanks modifry.

Do you know if it's documented anywhere what is supposed to be present on those lines? Can I safely tap into those lines with a voltmeter and get some meaningful results? Or are we talking complex signalling in here?

 

You should have no problem putting a meter on any of these without disturbing the car's operation. The VSS and tach signals are a square wave whose frequency changes with speed or rpm, so your meter probably will not measure it, unless you have a fancy one with a frequency counter built in.

Throttle position - red/black C27 on ECM this is a 0-5 volt analog line (pretty sure)
Speed sensor - Blue/white A9 on ECM a 0-12 volt square wave, about 45 Hz/mph
Tach - Blue A19 on ECM 0-5 volt square wave, engine rpm/30
MAP senosr - Green/red C17 on ECM 0-5 volt analog signal
Brake pedal - white/black A32 on ECM 0 or 12 volts (12 volts is brake pressed)
VTEC - Green/yellow B12 on ECM 0 or 12 volts (12 volts is VTEC engaged)

 

Modifry, or any other expert: Is this a good tap-in? What else would you recommend to tap into the ECM lines? Thanks.

 

I can answer that one..................those things are EVIL!!! They will work for now but in 2 days it could go bad. Crimp caps/Solder and tape best ways to link in wires.

 

[QUOTE]Originally posted by Pinky
[B]
I can answer that one..................those things are EVIL!!!