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90 ALDL Connection problems

jimmers

Well-known member
Joined
Mar 27, 2005
Messages
302
Location
Canada
Corvette
1990 Red Coupe 6 speed
I tried all night to connect my laptop to my 90 but it didn't work. I tried using DataMaster, TunerPro, and WinALDL but they didn't work. DataMaster says my cable is fine but it can't communicate with my PCM. Correct me if I'm wrong but doesnt my car have an ECM instead of a PCM? I'm using DataMaster 8D which I believe is the right program. I built my own ALDL cable and tested it with ALDL Test and it passed. I tried 2 different laptops with Windows Xp and 2000. I tried using pin M for data because I dont have a pin E. Am I using the right cable and software? This is the schematic of the cable I built. Thanks!
aldl_2transistor.gif
 

G Winter

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Joined
Aug 21, 2004
Messages
2,177
Location
NW Iowa
Corvette
1990 red convert 6 sp
I don't know if this is like comunicating with CNC machines but port setup is important on those, Baud rate etc. If nobody chimes in do some research on that part of it.

Glenn
:w
 

nickyg

Active member
Joined
Apr 9, 2006
Messages
43
Location
Taylors, SC
Corvette
1994 C4 Black on Black 6 speed
Since you have the cable and Tunerpro RT, you need to download 2 files. First you must identify your ECM and download and save the definition (.bin) file for it. Second, you need to download the .xdf file for the program to communicate from the ECM to the computer. I just did this recently and it hooked up just fine. You can download definitions at http://tunerpro.markmansur.com/downloadBinDefs.htm
You'll also notice at the bottom of the page links to more defs. Try them also as you're sure to find the correct one.
 

jimmers

Well-known member
Joined
Mar 27, 2005
Messages
302
Location
Canada
Corvette
1990 Red Coupe 6 speed
Since you have the cable and Tunerpro RT, you need to download 2 files. First you must identify your ECM and download and save the definition (.bin) file for it. Second, you need to download the .xdf file for the program to communicate from the ECM to the computer. I just did this recently and it hooked up just fine. You can download definitions at http://tunerpro.markmansur.com/downloadBinDefs.htm
You'll also notice at the bottom of the page links to more defs. Try them also as you're sure to find the correct one.

I also tried that but didn't have any luck. Maybe I need to try more definitions. My ECM is labeled as 1227727 but I can only find a 1227730 for a 90-91 L98. Will the 1227730 work? TunerPro always says my ALDL cable is not connected. Should I be using Pin M for data?
 

G Winter

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Aug 21, 2004
Messages
2,177
Location
NW Iowa
Corvette
1990 red convert 6 sp
Are there port settings in the TunerPro ? Sounds an awful lot like a port issue with other software-hardware.

Glenn
:w
 

jimmers

Well-known member
Joined
Mar 27, 2005
Messages
302
Location
Canada
Corvette
1990 Red Coupe 6 speed
Are there port settings in the TunerPro ? Sounds an awful lot like a port issue with other software-hardware.

Glenn
:w

Not that I can see. There arent many options regarding cable connections.
 

jimmers

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Joined
Mar 27, 2005
Messages
302
Location
Canada
Corvette
1990 Red Coupe 6 speed
Well I tried another laptop tonight and still no luck. Should I be using the 2 transistor ALDL cable?
 

jimmers

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Joined
Mar 27, 2005
Messages
302
Location
Canada
Corvette
1990 Red Coupe 6 speed
Yes, definitely.
Thanks, thats what I thought. I'm completely stumped as to why it won't work then. I've played around with com settings and still no luck.
 

nickyg

Active member
Joined
Apr 9, 2006
Messages
43
Location
Taylors, SC
Corvette
1994 C4 Black on Black 6 speed
The 1227730 bin and the super_8dm2.ecu for your xdf should work. After reading the message boards for tunerpro, it seems that previous versions of RT had problems with hook up to 90-91 Corvettes. Just make sure you have the current version.
 

gmboileau

Active member
Joined
May 20, 2005
Messages
26
Location
Toronto
Corvette
1990 Red Convertible
Hi
I went through the same exercise as you have trying to get my laptop to communicate with my 90 L98. I bought a serial /ALDL cable triedseveral softwarepackages, definitions and two laptops but had no success. In the end I came to the conclusion that the I was not using the correct definition for my ECM and that it was not readily available.
I hope you solve this problem and share it with the rest of us.

Cheers
Gary
 

jimmers

Well-known member
Joined
Mar 27, 2005
Messages
302
Location
Canada
Corvette
1990 Red Coupe 6 speed
The 1227730 bin and the super_8dm2.ecu for your xdf should work. After reading the message boards for tunerpro, it seems that previous versions of RT had problems with hook up to 90-91 Corvettes. Just make sure you have the current version.

I have the latest version of tunerpro, but i'll try the definition files you posted. Thanks for the help!
 

jimmers

Well-known member
Joined
Mar 27, 2005
Messages
302
Location
Canada
Corvette
1990 Red Coupe 6 speed
Hi
I went through the same exercise as you have trying to get my laptop to communicate with my 90 L98. I bought a serial /ALDL cable triedseveral softwarepackages, definitions and two laptops but had no success. In the end I came to the conclusion that the I was not using the correct definition for my ECM and that it was not readily available.
I hope you solve this problem and share it with the rest of us.

Cheers
Gary

If I get it to work I'll post my findings.
 
Joined
Aug 30, 2002
Messages
1,533
Location
Colorado Springs, CO USA
Corvette
84 Z51 auto R.I.P. 89 black roadster SOLD
I went through this recently with a 7730. I used the 4-transistor interface tho.

You not only have to have a definition (XDF) for the ECM, but it has to be correct for the particular bin...not just "any 'ol" 7727 definition file will work. (at least that was the case with the 7730)

Snoop around on thirdgen.org...there's so much info on this sort of thing it's just mind-boggling.

Bill
 

jimmers

Well-known member
Joined
Mar 27, 2005
Messages
302
Location
Canada
Corvette
1990 Red Coupe 6 speed
I went through this recently with a 7730. I used the 4-transistor interface tho.

You not only have to have a definition (XDF) for the ECM, but it has to be correct for the particular bin...not just "any 'ol" 7727 definition file will work. (at least that was the case with the 7730)

Snoop around on thirdgen.org...there's so much info on this sort of thing it's just mind-boggling.

Bill
I signed up for thirdgen yesterday but I havent recieved my confirmation email yet. I guess I need to try more xdf files. Thanks!
 
Joined
Aug 30, 2002
Messages
1,533
Location
Colorado Springs, CO USA
Corvette
84 Z51 auto R.I.P. 89 black roadster SOLD
I signed up for thirdgen yesterday but I havent recieved my confirmation email yet. I guess I need to try more xdf files. Thanks!

Does your memcal module have a 4-digit code on it? (usually starts with "A") May be on the EPROM itself under that blue plastic cover?
 

jimmers

Well-known member
Joined
Mar 27, 2005
Messages
302
Location
Canada
Corvette
1990 Red Coupe 6 speed
Does your memcal module have a 4-digit code on it? (usually starts with "A") May be on the EPROM itself under that blue plastic cover?

I have 2 codes that begin with A. There is one on the blue cover that is ARFP and one on the chip itself which is AD89.
 

jimmers

Well-known member
Joined
Mar 27, 2005
Messages
302
Location
Canada
Corvette
1990 Red Coupe 6 speed
Well guys I finally got it to work!!! I removed the resistor that connected cables A and B and it worked! Thanks for all your help through this. Now I have to figure out to read all the data!:beer
 

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