'96 and '97 PCM's

[EK]

The new Hughes Auto-Xray EZ-link units will talk to OB2  68332 family,
specifically the 16193495 BABB flash VCM. It will NOT talk using the 1995
ALDL commands thru the 16 pin OBD 2 connector, or the special 16 pin adapter
cable although it does have pins for ALDL in addition to VPW pins. I never
verified they are connected on VCM, but they do have wires going somewhere.
I had to enter vehicle as 1996 GM OBD 2 generic to get any kind of response.
Monitor mode provides minimal data - timing, map, both O2, load, TPS,
engine, vehicle speed, temperature and a few others. No EGR pintle position,
which is what I was looking for at the time.  I also tried most all the Vin
codes with no response in the ALDL mode, since this mode seems to give many
more parameters, at least it does on a 1995 Olds with a quad 4 I also
tested. I also tried the B&B Autotap as well, and could not get any response
with it on my truck back in July. It did work very well on a friends 1996
V-6 S-10, with a full laptop screen of updating data goodies. People at B&B
were very helpful, but couldn't get it working for my application. Of course
I took the Hughes apart to see the 8051, TSOP 28F0?? flash and Xilinx part
inside, but didn't do any probing - kind of expensive to break. Surprised at
the lack of hardware in it for doing all the Ford, GM, Chrysler OBDII.


-----Original Message-----
From: Dave Hempstead <dave_hempstead at agilent.com>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: Tuesday, December 07, 1999 2:09 PM
Subject: '96 and '97 PCM's


>Hi,
>   I know there are guys out there working on understanding the software
>inside the '96 or '97 PCM's.  If I remember someone is working on a '97
>Camaro, and someone is working on a '96 Vette.  If you are working on
>either of these, could you please let me know?  If I remember right, I
>think Tom Hussey was one.   I've got questions regarding communication
>with these PCM's:
>  1.  Do they still support ALDL communication (in addition to OBD-II
>communication)?
>  2.  If yes, what protocol do they support?
>  3.  If no, what hardware are you using to communicate with the PCM.
>
>I hope to start digging into these PCM's soon (aside:  soon is such a
>relative term......).  I've ordered Alex's OBD-II interface
>
>Any help will be appreciated,
>Dave Hempstead
>dave_hempstead at agilent.com
>