Re: RPM signal, logic-level or other for MY06? (Turb04S60)
<br><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Turb04S60</b> »</i></TD></TR><TR><TD CLASS="quote">I have access to the diagrams for 06, what exactly are you looking for?<br></TD></TR></TABLE><p>Sounds good, thanks!<p>I'm looking for the RPM signal from the ECU (if such a thing exists), or from any controller in the car that outputs the RPM.<p>From what I've read in other posts there are two wires from the fly-wheel sensors which the ECU uses as it's RMP source, this might also work for me but ideally I'd like to find a pulsed logic-level signal to drive a circuit that will capture and store RPM (among other things).<p>If you can send me info just IM me for my e-mail address. Thanks.<p>LTA<br>
All that kinda data is transmitted via the CAN network. You coulld tap into the sensor itself, but i wouldnt suggest it since the circuit is already susceptible to electromagnetic interference, and lengthening or splitting the wires could only worsen that. <p>Why do you want to capture this signal?
The signal is on the CAN bus, but if you want to tap into it, the Dietz adapter for stereo systems also has the following signals available:<p>power on (1 amp max)<br>lighting level (1 am max)<br>speed<br>phone mute<br>reverse gear<br>stereo controls, with the correct adapter, and wheel controls on the car<p>The Dietz box and adapter cables are about $250, so that is an expensive way to get the speed signal, but someone else has already done the CAN bus decoding for you.
That wasn't my point, <br>You were talking about how lengthening or splitting wires could introduce too much EMI. With the high impedance tap on the circuit, EMI shouldn't be a problem and the signal current is hardly affected. You also don't necessarily need to cut/strip the wire if you tap directly from the sensor connector, or the ECM harness. <br>Most people use this approach for tapping into MAP sensor for DIY boost gauge signal.<p>...anyway, sorry for the confusion. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/embeer.gif" BORDER="0">
Thanks for all the quick replies.<p>I know all about what's avalable via CAN using generic OBD2 (I use PCM Scan and set up the SS group buy to boot!)<p>I'm planning for a self-contained alternative to my current Windows-laptop-based PCM Scan OBD2 system (and it will also augment PCM Scan).<p>I'm going to use a TechEdge 2Y to log and store: RPM, Boost (MAP) and A-mist flow (and I may eventually add IAT and WB02). The 2Y can run stand-alone and store up to 60mins of data in non-volatile RAM and can also interface to PCM Scan so that when desired I can add the logging of BOOST and A-mist flow to PCM Scan.<p>The 2Y can accept two types of RPM input signals: 1. Old-style coil/points type signal, or<br>2. Modern logical-level ECU-type signal.<p>Option 2 is probably the best bet for the P2 Volvo.<p>I prefer not to tap off the flywheel sensor, since that could mess up what the ECU is reading. So I would rather tap into the other side, that is, the output side of the ECU's RPM signal.<p>My G-tech is able to filter off the RPM signal when its powered directly from the +12V termianl under the hood so I could probably build a circuit to do that for me but I don't want to go there.<p>So my question is:<p>Is there a logic-level RPM signal available from the ECU, or any other module?<p>LTA<br>
Your missing my on the "logic level" . Thats not the same term that would be used on diagrams.<p>You could try and create some kind of a inductive pickup and run it off one of the coils. That would be the least invasive and should be pretty reliable.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Turb04S60</b> »</i></TD></TR><TR><TD CLASS="quote">Your missing my on the "logic level" . Thats not the same term that would be used on diagrams.<p>You could try and create some kind of a inductive pickup and run it off one of the coils. That would be the least invasive and should be pretty reliable.</TD></TR></TABLE><p>'Logic level' as in TTL level or 5V. Maybe it's an old, outdated term, sorry.<p>I guess a simpler way to ask is does the ECU have an <B>output</B> labeled RPM. I'm going to guess that the answer is no because the ECU probably only provides it via the CAN bus.<p>LTA<br>