Thread: wierd problem
View Single Post
Old 09-09-2012, 09:35 AM   #24
LTb1ow
Mongo the Meet Coordinator
 
LTb1ow's Avatar
 
Join Date: May 2008
Posts: 16,938
iTrader: (8)
I am kinda speaking from a 95 OBD1.5 area, not 100% on the early stuff, but I know for mine, the data port serial line ties into the brake system for some weird ass reason. So what I mean was you could have continuity to from PCM to ADL port, but if the line that ties into it is fubar'd, could be throwing weird stuff into the mix.



You checked continuity from pin to pin right? Maybe theres an issue with the pin to PCM connection?

Edit: and yes, sorry B is a mode select for the scanner. A is your primary ground.

The PCM has the serial data on Blue 30 (D30). This needs to go to "M", "E", or 09, depending on your connector above. It's a tan wire on a 1994 PCM.

Mode select needs to go to Blue 20 (D20). It's a White/Black wire a my 1994.

ALDL Ground needs to be tied in to Blue 1 (D1). This ground wire actually winds its way through the chassis to get to the PCM, but it wouldn't hurt to run a jumper wire directly to it. The better your ground, the better your ALDL communications reliability.

Mode select typically isn't used on our cars for the laptop based scan tools or the LT1_Edit program. It's for diagnostic modes that only the Tech2 will allow. So, it's good to wire up if you think one day you'll hit it with a Tech2, but you don't have to have it wired up.

Last part paraphrased from AKM.
__________________
Quote:
Originally Posted by KirkEvil View Post
repo bigals turd gen and part it out to a loving home

Last edited by LTb1ow; 09-09-2012 at 09:43 AM.
LTb1ow is offline   Reply With Quote