Tachometer input signal.

[JestersG60 at worldnet.att.net (Eric Lonchambon)]

C'est TACHOMETER est pour la RPM.
 au revoir mon amie
-----Original Message-----From: ATS - Patrick Bureau <.


>the TZH (ignition module) on the rocco PIN #7, is an output electrical fo
>the rpm.
>I know I maybe answering completly off the question but being french I am
>usure what you are calling tachometer (ie: speed or rpm)
>
>
>ATS - Patrick Bureau - txrocco@sbcglobal.net
>Http://www.longcoeur.com/scirocco/
>============================================
>'85 2.0L Prowler Orange Kamei X1 Rocco
>'85 1.8L Titian Red Rocco (daily driver)
>'98 4.0L Jeep Cherokee
>'91 7.3L F250 diesel Super cab,8 Ft box.
>
>
>
>=>-----Original Message-----
>=>From: scirocco-l-bounces@scirocco.org
>=>[mailto:scirocco-l-bounces@scirocco.org]On Behalf Of Bradley Peet
>=>Sent: Saturday, May 24, 2003 5:28 PM
>=>To: Marc Scirocco Qu?bec; 'Scirocco List'
>=>Subject: RE: Tachometer input signal.
>=>
>=>
>=>I don't know if you're familiar with transistors, but the ECU outputs are
>=>open-collector switches that sink current to ground.  +12V is supplied to
>=>one side of the coil at all times, the other end of the coil goes
>=>to ECU (or
>=>an ignition amplifier) that switches it to ground.
>=>
>=>I'd have to assume that the tachometer has it's own 12V source
>=>and needs the
>=>"input" pulled to ground, as is done with the coil.  I'm going to head
out
>=>to the garage now and perform a few tests to try and verify that theory.
>=>
>=>Bradley
>=>
>=>> -----Original Message-----
>=>> From: Marc Scirocco Qu?bec [mailto:marc_scirocco@sympatico.ca]
>=>> Sent: Saturday, May 24, 2003 1:51 PM
>=>> To: 'Bradley Peet'; 'Scirocco List'
>=>> Subject: RE: Tachometer input signal.
>=>>
>=>>
>=>> Looking at your diagram, what is input, and what is output?
>=>> Because it looks
>=>> as the ECU outputs are facing the wrong end of the diodes. What is the
>=>> intended signal flow? From the ECU to the tach? If yes, perhaps you had
>=>> better reverse the diodes.
>=>>
>=>> Cheers.
>=>>
>=>> Marc
>=>> '83 Scirocco
>=>> '88 Scirocco Slegato
>=>>
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