i purchased this cable:
http://www.obd2allinone.com/sc/detai...item=aldlobd1u

downloaded tunerpro, and the file to datalog with my 90z28 checked the cable with tunerpro and it reades the cable when i have the cable plugged in the cable and the ecm does not connect and no data streams, and it does not show connected on tunerpro. i can switch the ignition from on to off tunerpro will connect for about two seconds read data and then flash error at the bottom of the page.... ive re loaded the drivers about four times and cant seem to figure it out any suggestions?

 

https://www.thirdgen.org/forums/tpi/...rpro-help.html
what is the voltage on the serial data line ?

 

The voltage at all the pins

A.113
B5.082
C.004
F.069
K5.095
M10.44

 

M on the aldl is usually 2.5v or higher you have serial data.

 

What would cause a no connection between the aldl cable and tunerpro?

 

Have you tried all your com ports ?

 

I went up to com port 8. And none could establish a link other then the split second the key was turned from on to the off position

 

Just curious are you using windows 8

 

Windows 7 home premium

 

Im not sure what to tell you to try, other than contacting the manufacture of your cable, moates, red devil river, aldlcable.com ect..

 

Yeah. I figured it end up there just wanted to make sure my bases were covered I appreciate all the help. Thanks

 

Wish I could tell you more but sounds like you have covered it all. If you can jump the a to b on the aldl and get the check engine light to blink you would have verified the ground on pin a and the ecm diagnostic terminal.

 

I checked it and it worked.
I went with the cable due to the moderate price being stationed in hawaii makes shipping so expensive. But as always you get what you pay for I am sure moates cable would have worked flawlessly.

 

Not necessarily, they are failing too now as are all cables!

We've found FTDI chips used in making these cables, not counterfit, from same lot, work with one drive and not the next. None seem to be working with latest updated driver from FDTI. But there is 1-2 old drivers that work with all.

You can't just pick a COM port and try it, in Windows 7 look in Printers and devices to see the cable and right click to find which Com port it is installed on. Then see what driver.

Here's instructions and link to the thread working on this issue:
http://www.gearhead-efi.com/Fuel-Inj...to-TunerPro-RT

 

Nice find Mark

 

Thanks! I did the write up on how to install a cable for TunerPro and it worked flawlessly for years.

But I am not responsible for the driver update issue found, those people are linked and should receive credit.

 

I uninstalled all the drivers an rolled it back to a previous version. Still no luck making a link with the car. This is going to bug me till I figure it out

 

Turns out it was a ground on the rear of the engine. when the previous owner did the swap he ripped the grounds out. Thanks for the help.