Tachometer input signal.

[txrocco at sbcglobal.net (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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