RE: Engine light on getting code 12

[Mike Rolica <mrolica@meridian-mag.com>]

He he he.  Wna test mine:-).. 
Mike Rolica
Plant A,
Magnesium Products Division
Strathroy

(519)-245-4040  Ext. 244



	-----Original Message-----
	From:	Shannen Durphey [SMTP:shannen@grolen.com]
	Sent:	Sunday, July 30, 2000 4:58 PM
	To:	gmecm@diy-efi.org
	Subject:	Re: Engine light on getting code 12

	Sounds fine to me.  Code 12 with a&b jumpered is "no distributor
	reference pulses", a condition you should definitely have if the
	engine is not running.  Code 12 is sort of used as a sanity check
for
	the ecm.
	Check other GM cars, you will find the same thing.

	You haven't mentioned whether or not the engine starts, which would
be
	a key issue.  No pun intended. : )  No start with code 12 indicates
a
	need to make sure the dizzy is sending out pulses to the ecm.

	I'm surprised that you don't have a service manual for that truck.
It
	should have a description of the code, and a trouble tree for
checking
	it.

	However, if want some personal attention, you can send your Sy to
me,
	a professional mechanic, and I'll volunteer to flog it-- I mean test
	it and make sure everything is ok.
	Shannen 


	Keith wrote:
	> 
	> This is on a 91 Syclone ECM 1227749
	> I just replaced the engine in my truck and now when I turn the key
to
	>  the "on" position the check engine light comes on. I short out
the A &
	> B
	> on the ALDL and get a code 12. I've checked the "M" on the ALDL
and it
	>  is not shorted and has 4.8V going to it. I tried a good memcal
and new
	>  ECM and i still get the same code 12.
	>  Does anyone have any suggestions on what to do now?
	>  Is there a wire that i could have disturbed while replacing the
engine?
	>  Thanks.
	> 
	> --
	> Keith Gill F.A.S.T.
	> Riverview, FL
	> '91 GMC Syclone #2173
	> '75 Oldsmobile Hurst/Olds
	> '92 Nissan Sentra SE-R
	> http://www.syty.net
	> Direct Forum link -->>>
	> http://www.syty.net/cgi-bin/fast-cgi/Ultimate.cgi?action=intro
	> http://www.geocities.com/keith455
	> http://home.tampabay.rr.com/keith455
	>
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