Delco 16220371 ECU (Mercruiser 502 magnum MPI) EEprom
EFISYSTEMS at aol.com
EFISYSTEMS at aol.com
Fri Nov 13 18:33:42 GMT 1998
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aol lost it,,,its attatched
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<HTML><FONT SIZE=3D3 PTSIZE=3D10>In a message dated 11/13/98 2:16:50 AM =
Pacific Standard Time, mwichstr at online.no writes:<BR>
<BR>
<< Subj:=09<B> Re: Delco 16220371 ECU (Mercruiser 502 magnum MPI) EEprom<=
/B><BR>
Date:=0911/13/98 2:16:50 AM Pacific Standard Time<BR>
From:=09mwichstr at online.no (Espen Hilde)<BR>
Sender:=09owner-diy_efi at efi332.eng.ohio-state.edu<BR>
Reply-to:=09diy_efi at efi332.eng.ohio-state.edu<BR>
To:=09diy_efi at efi332.eng.ohio-state.edu<BR>
<BR>
<BR>
<BR>
> A friend of mine is prepairing for a dyno run in a superflow bench.<B=
R>
> The engine is a Mercruiser Magnum 502 MPI 1996model.The engine is<BR=
>
equipped<BR>
> with a procharger kit.<BR>
> Thats a sentrifugal compressor with a water to air intercooler, the<=
BR>
only<BR>
> change to fuel/ingition is a rising rate<BR>
> fuel pressure regulator.The compressor is giving a modest 5 psi<BR>
boost.The<BR>
> boost starts from 3000rpm.<BR>
> We are going to strap the engine to the dyno with headers and have th=
en<BR>
> access to exhaust temp for <BR>
> each cyl. We can borrow a scan tool from mercruiser (price 1000<B=
R>
usd.) ,<BR>
> but we want a scan tool that can be used for cars and other<BR>
engines,maybe<BR>
> for a better price.Diacom?<BR>
> It would be nice to have access to the ecu , so we can alter the maps=
<BR>
for<BR>
> ignition and fuel under boost.<BR>
> Is it anyone who have info about this DELCO ECU? There are several<BR=
>
numbers<BR>
> attached to the ecu box:<BR>
> 16220371<BR>
> Modell 860371ka00002699 White =
tag<BR>
> :9456<BR>
> The box is just 13,5cm times 10cm<BR>
> One multipoint connector on each side , 32 pins each<BR>
> One connector in the wier harness to connect to the scantool : 10 pin=
s<BR>
and<BR>
> 6 is used. <BR>
> The efi system is MPI with MAP and knock sensor. No ego . Map sens=
or<BR>
is<BR>
> :039-5160<BR>
> injectors:5467(difficult to see) Ignition system is mercruiser HEI <=
BR>
with a<BR>
> distributor.<BR>
> It would be nice if this ecu was the same as a much used car ecu.<BR>
> We need advice on what equipment we need to be able to alter this ecu=
.<BR>
<BR>
AND how to do it!.......<BR>
<BR>
> Type of prom?<BR>
> E-prom burner?<BR>
> Eraser?<BR>
> Software?<BR>
> scantool?<BR>
> realtime modulator?<BR>
> Any input /ideas is appreciated <BR>
> Thanks <BR>
> Espen Hilde <BR>
> <BR>
> Hi Espen,<BR>
> The Mercury Marine computer has a 512 byte EEprom(not 512k)...<B=
R>
The box is not possible to open, since it is a EEprom, is it possible to=
<BR>
alter code without removing the chip?Or do we have to dig it out to read=
<BR>
it?Is the pinouts on the side direct to the EE prom?Is using EEproms usu=
al<BR>
in car ecus?I tought just aftermarket efi systems used it.How <BR>
where you able to read the 512k...sorry to bother with these details , =
I<BR>
got to have it by a small spoon. <BR>
<BR>
AZ Speed & Marine (602-753-0208) has communication cables for sale that a=
llow you to download to the ECM via the scanner(aldl) port....you can fol=
low that back through the harness to get to the pinouts needed to do an E=
Eprom dump and if you really want to get into it you can dump the code fr=
om the 68hc11 derivative rom pack....I haven't done it but shouldn't be t=
oo difficult if this is the direction you want to go......<BR>
<BR>
<BR>
what I<BR>
> haven't been able to figure out is whether this is a compressed format=
or<BR>
if<BR>
> 512 bytes is all they need since it is open loop and has very little<B=
R>
control<BR>
> over the engine....the only cool feature I have seen on it is if it se=
es<BR>
> enough knock not only does it remove timing it also enriches the fuel =
to<BR>
cool<BR>
> the chamber(about 1 air fuel ratio). As for the scanner...I have a cou=
ple<BR>
of<BR>
> new ones for $400.(US) with the 99 updates. Rhinda(Diacom) makes the<=
BR>
scanner<BR>
> for Mercury and they do offer a laptop version as well but can't remem=
ber<BR>
what<BR>
> I paid for it. From what I have seen the centrifugal setup you were<B=
R>
talking<BR>
> about doesn't handle the fuel enrichment very well and hurts idle qual=
ity<BR>
and<BR>
> part throttle cruising because of correcting the mixture by increasing=
<BR>
the<BR>
> fuel pressure at all times then boost compensating above that.....let =
me<BR>
know<BR>
<BR>
if this code in the ecu is very special , it is maybe difficult to use a=
2<BR>
bar MAP sensor,and calibrate for it.<BR>
Maybe we have to stick with low boost and adjust at wot where we know th=
e<BR>
boost is.<BR>
<BR>
> what you see,,,I am interested......AZ Speed & Marine does have the<BR=
>
capacity<BR>
> to alter the calibration in the ECU......I haven't spent much time<BR>
looking at<BR>
> the 512 byte file but think I figured out the rev limit and how to adj=
ust<BR>
how<BR>
> much fuel enrichment when the knock circuit is hit hard...but thats ab=
out<BR>
> it.....That processor does not do double bar fuel or timing,,,,<BR>
<BR>
Double bar fuel and timing......whats that,what is the bennefits?<BR>
<BR>
Double Bar(2 Bar) saying single bar gives you adjustability to 100 KPA (a=
tmospheric) and double gives you the range to go higher as in boost(somet=
hing like 250 KPA)<BR>
<BR>
but the new 99<BR>
> controller does,,,,bad thing is the 99 has a revolving checksum locati=
on <BR>
<BR>
what is a checksum needed for ?<BR>
<BR>
so<BR>
> has been really tough to even get started with.....as far as I know <B=
R>
unless<BR>
> you're GM or have some "backdoor" avenue to get the software, there is=
n't<BR>
any<BR>
> to be had,,,,,but again if you find some I am interested......btw the<=
BR>
checksum<BR>
> for your 512 is the 9496 on the outside of your ECU on that white<BR>
tag...Anyway<BR>
> hope that helps.<BR>
<BR>
Helped a lot , thanks Carl<BR>
Espen Hilde<BR>
</HTML>
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