[Diy_efi] RE: Swaping 1225550 crossfire with 1227747 (correction)

Steve Ravet Steve.Ravet
Thu Mar 23 20:00:53 UTC 2006

Chuck, you can go to the autozone WWW page and look up the pinout of the
550 ECM.  That should answer your W23 and W6 question.  As to why
there's no W22, is it manual transmission?

You can find 747 pinouts there also, or there is a scan on the gmecm
page (diy-efi.org, click gmecm, click ECM info, click 1227747, scroll
down for service manual pages.  B7 is ESC, which is knock detect.  To
use this you'll need a knock sensor appropriate for your engine, and an
ESC module for your engine.  Both of these match the engine and should
be easy to find at the junkyard.

B10 is park/neutral input.  You can read all about this input in the
archives.  It can affect idle and stall saver, and probably other things
too.  Also should be simple to find a switch in the junkyard so you can
provide this input.

I think crossfire -> 747 is pretty common, you should probably ask on
the gmecm list.  And I know there are crossfire specific forums on the
internet, have you looked for them?


> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org 
> [mailto:diy_efi-bounces at diy-efi.org] On Behalf Of Chuck Kahler
> Sent: Thursday, March 23, 2006 1:48 PM
> To: diy_efi at diy-efi.org
> Subject: [Diy_efi] RE: Swaping 1225550 crossfire with 1227747 
> (correction)
> I have made all the wire splices on the 1225550 harness into 
> the connectors I got with the 1227747.
> I have a couple questions. (I don't have pinouts for the 1225550)
> C7 on the 1227747 should connect to the W22 (high/forth gear) 
> on the 1225550. There was no W22 in my "White connector". 
> There is a W23 that didn'
> t get used and also a W6 that didn't used. What were the W23 
> and W6 for and should they be connected to something?
> My other question is there are the following "Black 
> connector" wires that never got spliced with the 1227747;  
> B7, B10 & B11.  Is this reasonable not to have them hooked to 
> anything.
> Thanks for the help,
> Chuck
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