ECM Wiring Diagram

[Bruce Plecan]

-----Original Message-----
From: Cbm8296 at aol.com <Cbm8296 at aol.com>
To: DIY_EFI at efi332.eng.ohio-state.edu <DIY_EFI at efi332.eng.ohio-state.edu>
Date: Monday, December 28, 1998 10:35 PM
Subject: ECM Wiring Diagram

If I understand you correctly you want a tach signal, well the module that
does
the switching is in the dist/coil module.  The ecm deals with much lower
volt/
amperage levels then the ignition module.  I wouldn't tap into it for a
remote
starter,  I'd rather risk an ignition module than an ecm if it should fail.
Bruce


>
>Does anyone have a wiring diagram for the 1228321 ECM they could share with
>me?  This ECM is used on TBI 4-Cyl Cavaliers, Berettas, Corsicas, and
>Skyhawks.
>Specifically, I'm looking to find out which wire on the two large harnesses
>coming into the ECM has the tach input.  I have installed a remote car
starter
>in my vehicle and set it to "tachless" operation.  I would like to set it
up
>to work with the tach pulse for more reliable starting.  To do this, I have
>been told by two sources I have to pick up the pulse from the white wire at
>the coil, poking a hole in the firewall in running a wire out to the coil.
>Since the tach input is already run into the ECM, it seems kind of a cob
job
>to run a wire out there when it already comes into the car.  I'd like to
just
>pick off the signal from the ECM harness inside the car, if anyone can
>identify the wire for me.
>
>Thanks for your help.
>