Dead driver on '165?

[Mike Rolica]

Try 30-60 hz.  Are you using an open collector to ground vats?
Mike Rolica
EXT. 260
 :-)


	-----Original Message-----
	From:	Bob Valentine [SMTP:bob at tecmark.com]
	Sent:	Tuesday, October 26, 1999 9:07 PM
	To:	gmecm at efi332.eng.ohio-state.edu
	Subject:	Dead driver on  '165?  

	Here's what I've got, and I'm suspecting either the injector drivers
or
	something else is fried in this ECM.  Note that I never actually ran
it in
	a car.  I've checked most of the sources for a schematic of the '165
and
	haven't found any.  Is there one?  Again, this is '165 / ABYA (88
350 Camaro)

	My "test bench" consists of the ECM, all non-emissions related
sensors
	(except for VSS) and all 8 injectors (note I'm using Ford injectors
which
	tested ok on my 555 injector cleaner/tester).   I have the dist.
hooked to
	a variable speed motor, I've been "cranking" the motor at about
100-300 rpm
	(dist speed) which corrolates to about 200-600 crank rpm.    MAF is
hooked
	up, park/neutral line is tied +12, FP is also hooked up.  TPS is set
a .5v

	On "cranking" the FP comes on and stays on until "cranking" stops.
IAC
	motor can be heard exercising slightly.   The injectors never fire,
not
	even once.  Swapped in a noid light, it doesn't come on either.   I
have a
	555 VATS eliminator tied to pin B6, I've tried frequencies ranging
from
	about 20 to 40 hz (as determined by my o-scope).   With or without
the VATS
	makes no difference in the operation below.

	Everything seems fine except for the fact that the injectors don't
fire.
	The check-engine light (no scanner / aldl reader yet...) turns off
	momemtarily while cranking, then comes back on.    ECM is setting a
code
	34;  low MAF reading. This is to be expected since there's no
airflow....
	;^>  I've checked for power at all sensors and the MAF - it's there
and good.

	The only other thing is that the main heatsink in the ECM gets
fairly warm
	after about 10-15 minutes of power applied.   Is this normal?

	So are the injector drivers bad, or is there still something with
the VATS?




	--> Bob Valentine
	--> bob at tecmark.com