Nissan Datascan - works on my 91, but not my 90?

[Whteldy]

Sorry to cross post, but this link to 300ZXClub.com contains much trouble shooting I've already executed.
http://www.300zxclub.com/showthread.php ... ost2469973

But as the title says...I've had NDS for while and new version of the PLMS cable. Less than a year old. It works flawlessly on my 91 2+2 TT, but not on my 90 NA. I've tried adjusting the PLMS Com Port latency setting, re-"Find ECU", etc. There's really not a whole lot to try within NDS itself.

In short, I can connect to the ECU, but only if the car is off with the ignition at the ACC position. Once I turn the car on, all connectivity is lost and F1 Data Display button becomes inactive.

Anyone have any suggestions? Please help.

[seb.racing]

you get connected you when your engine operates?
my S14, it happens that the connection may stop when I start the engine
I reconnect and it's good