I have a 1995 with a MSPNP2 v1.2 which has worked pretty darn well for me since I got it a few years back.
I had never updated the firmware so it is still running version 3.2.1, I was having cold start issues and was going to work on some of the cold start settings in tunerstudio v2.6.04.
I plugged in my FTDI usb adapter and turned the key to the on position, the car wasn't running yet... tunerstudio recognized the ecu as it usually does and it opened the screen to notify me that my open project had different settings from those loaded on the controller(ECU), so I selected "load from controller" to keep the current settings from the ECU.
At that exact moment things went haywire, and tunerstudio did some things I have never seen before. I noticed that numbers on the gauges in the open dash in the backround went off the charts high like a 56,000 rpm number for example and then an error message appeared which I am sorry to say I didn't screengrab. It was saying something like that tunerstudio lost connection with ECU, but not the normal message I have seen before. Ever since this moment I have been unable to establish any connection with the MSPNP2 and it appears that both the tune and firmware have been either corrupted or wiped out.
I have had connectivity issues in the past related to inferior serial to usb adapters, and this is not from that. I had went ahead and bought the correct FTDI one from efi analytics, I also have a serial to expresscard adapter which has worked fine in the past too.
Nothing works now, the car wont start and it's obvious that there is no tune loaded on it when i crank it, and I cannot establish any sort of connection with the MSPNP2 thru various computers and adapters.
I have troubleshot with this guide: Megasquirt Serial Setup
I able to get loopback in miniterminal with test A, which should mean that my serial adapter is indeed working.
Test B fails, I cannot get firmware loopback from MSPNP2 when it is powered on.
I have not tried "test C" yet to see if I get loopback thru the CPU socket as I don't want to void any potential warranty since this is a MSPNP2
From what I can gather it seems as though there is no firmware/corrupted firmware loaded on my MSPNP2 now. I also tried to update the firmware from 3.2.1 to 3.3.2 but the firmware program cannot establish a connection with the MSPNP2 now either.
I get 2 green lights on the ECU when it is powered on, I am hoping this is a good sign that the ECU isn't bricked. Unfortunately this car was recently pressed into service as a daily driver as it's my only car now, it has a turbo and big injectors so switching back to the stock ECU would be problematic for me.
Any ideas? Do I need to change a jumper inside the MSPNP2 v1.2 to be able to re-establish serial connection for a fresh firmware load? I am fairly computer savvy, but this one has me stumped.