749 in a 730 - troubles

[TK]

If you disabled code 43 (ESC sensor), it crashes the ECM. I found this out
running the 749 in my Fiero. I had to rewire the injector drivers to the
Syclone wiring (my 749 can out of the Quad 4). I had to make some other
changes to.

Terry
----- Original Message -----
From: David Cooley <n5xmt at bellsouth.net>
To: <gmecm at efi332.eng.ohio-state.edu>
Sent: Thursday, August 12, 1999 7:10 AM
Subject: Re: 749 in a 730 - troubles


> At 01:16 AM 8/12/1999 -0800, you wrote:
>
> >I haven't quite figured out what the second interface chip (34984 or
> >79435) in a 749 does.  It for certain runs the second P+H injector
> >driver.  But it has been reported that the SyTy doesn't use that
> >feature.  The 2nd chip might provide an extra input port or peripheral
> >control.
> >
> >Perhaps the SyTy code expects the functionality of this extra chip, and
> >gets confused when it is missing.  That might be why 730 chips work in a
> >749, but not the other way around.  (730's are missing the 2nd chip.)
>
> Not sure what it uses to drive it, but the SY/TY has a coolant pump for
the
> liquid/air intercooler that is run by the ECM.
> Could be that chip is driving the relay... without it it gives a code...
> Need to disable the coolant pump code for the intercooler if that's the
case.
> ===========================================================
> David Cooley N5XMT Internet: N5XMT at bellsouth.net
> Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
> We are Borg... Prepare to be assimilated!
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>
>