Diagnostic port differences
Thread Starter
Instructor
Joined: Aug 2008
Posts: 130
Likes: 2
From: Bowling Green Kentucky
Diagnostic port differences
Whats the difference in diagnostic ports in an 89 and a 93? A friend has Datamaster and the cables for his 93 and I wondered if i could plug into mine.
Burning Brakes
Joined: Apr 2006
Posts: 765
Likes: 0
From: Houston Texas
89 Y-Body 5.7L PFI (L98) DM35x32 - Complete Installation
NOTE: 86-89 LB9 and L98 vehicles require 10K resistor modification in the interface.
93-95 Y-Body 5.7L (ZR1) DM35xZ2 - Complete Installation
Different definition files...just download the one above for your car, software is the same, you get 20 free uses.
Hopefully, your friend's interface module includes the 10k resistor. Otherwise buy one and put it across pins A & B at the ALDL connector. It only changes/matches the baud rate of the computer.
Burning Brakes
Joined: Apr 2006
Posts: 765
Likes: 0
From: Houston Texas
A and B are the 2 top right pins. Here is a link to look at the connector.
http://www.obd2allinone.com/sc/toplevel.asp?cat=2
Scroll down below the cable shown.
Thread Starter
Instructor
Joined: Aug 2008
Posts: 130
Likes: 2
From: Bowling Green Kentucky
So is it as easy as sticking each end of a 10k ohm resistor into A and B, then plugging in the ALDL cable?
If I try to connect without the resistor am I going to fry my ECM?
If I try to connect without the resistor am I going to fry my ECM?
Burning Brakes
Joined: Apr 2006
Posts: 765
Likes: 0
From: Houston Texas
You might look behind the ALDL connector and see if pin B is wired. If not, you don't need the resistor. If so, and you can stick the resistor behind the connector, that will be good.
