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Discussion Starter · #1 ·
Has anyone found a logic-level RPM signal for MY06?<p>Anyone have access to MY06 wiring diagrams?<p>LTA<br>
 

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Re: RPM signal, logic-level or other for MY06? (LTA)

I have access to the diagrams for 06, what exactly are you looking for?<br>
 

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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>
 

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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?
 

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Re: (Turb04S60)

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.
 

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Re: (Turb04S60)

Not necessarily,<br>You could take multimeter approach, and tap into the circuit using high impedance, then amplify the signal with an op-amp. <br>
 

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Re: (Turb04S60)

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">
 

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Discussion Starter · #11 ·
Re: (Turb04S60)

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>
 

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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.
 

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Re: (Turb04S60)

<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>
 
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