ALDL project

[Ward Spoonemore]

Your AYBN Calibration is a P4 series ECM using the ecm you listed, the
applications are:

my 1991 1/2	4.3l LB5 vin Z Syclone Truck
my 1992 	4.3l LB5 Vin Z 'T' truck
my 1992 	4.3l LB5 Vin Z 'T' truck

I suspect that this is a uneque series not used by other platforms.

8192 baud in a "handshake" modality.
There are 5 different Comm modes

Mode 1: Diagnostic data, 63 bytes long
Mode 2: A memory dump (64 contagious bytes at a time)
Mode 3: Selectable memory bump, may format and dump up to 8 bytes
Mode 4: Provides the ability to alter specific ECM function on the fly. AFR.
EGR SPK Etc.
Mode 7: Command mode, (restores normal operation)

All of these command require the issuance of a message request for each
occurrence of the desired mode.

I assume from your prior e-mail you are using mode one at this time is that
correct ?

and what else would you like to know ?

ard

> -----Original Message-----
> From: owner-diy_efi at efi332.eng.ohio-state.edu
> [mailto:owner-diy_efi at efi332.eng.ohio-state.edu]On Behalf Of Barry
> Tisdale
> Sent: Monday, March 01, 1999 8:51 PM
> To: diy_efi at efi332.eng.ohio-state.edu
> Subject: RE: ALDL project
>
>
> 1991 GMC Syclone 4.3 turbo
> ECM# 1227749
> Scan ID: 3971
> Delco ID: AYBN 4175
> GM part # 16164174
>
> Actual chip being used is an aftermarket, but lookup table, open
> loop changes only.  Data xmitted by stock chip & aftermarket chip
> corresponds.
>
> Thanks - Barry
>
> At 07:57 PM 3/1/99 -0800, you wrote:
> >If you list the part number and Chip broadcast code perhaps we can find
> >something.
> >Ward
> >
>