[Diy_efi] DataMaster "10k Ohm resistor modification?"

[Brendan Patten]

What you are doing is enabling the high speed data mode on the computer.
The 10K resistor does go between A and B (these are the same two pins
you short to get trouble codes) leave your hardwired serial cable as is,
and add the resistor.

Now my experience is the resistor is only needed to get it started after
that data will continue till you disconnect power down ECM.  This
happened to me last week.  I was data logging a 1989 TPI setup and data
was doing fine and I noticed my resistor popped out, but it was still
running.

Anywho, that's my 2 cents worth.



-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
On Behalf Of Rich Rubel
Sent: Thursday, October 12, 2006 9:22 PM
To: diy_efi at diy-efi.org
Subject: [Diy_efi] DataMaster "10k Ohm resistor modification?"

I'm trying to use the demo of TTS's DataMaster monitoring software on  
my 86 Corvette (350ci, manual trans) and cannot get the ECM to sync  
with the software.  On their website, there's a note that to use the  
software one must perform the "10k ohm resistor modification" to the  
ALDL interface.  However, nowhere does it actually say what that  
modification IS.  I called their tech support and haven't heard back  
from them yet.  Does anyone here have any ideas?  One person told me  
to just put the resistor between terminals A & B on the ALDL port.   
Tried that, and it didn't work.  However, my ALDL cable is a bit  
different than most - instead of plugging into the socket and needing  
a custom plug, it's a normal 9-pin serial cable hardwired into the  
BACK of the interface.  Then another adapter is used to make the  
signal readable by the laptop.  So it's possible that with my setup I  
need the resistor between two lines on the cable instead... or  
perhaps not.

Any thoughts?

Thanks.
[RICHR]
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