lost connection to Usquirt within 2 min of running -SOLVED-

[65looter]

Hi,

I have the Usquirt V2 (from DIYAutotune), finally finished my wiring today and decided to test it.
I'm using a USB-serial adaptor (the same I used with the Megasquirt 1 extra), Windows XP pro sp3.
Unfortunately here's what happened today:

laptop is on
Megatune is on
turn the ignition key to on (not starting the engine)
I hear the beep from Megatune
nothing much going on for a minute or two
boom, lost connection to the Usquirt

At that point, after loosing the connection, I can't even do the communication test. It always says: failed.
The only wires I have left to connect are the tach input one and the warmup LED, using the Usquirt for fuel only so every ignition wires are not used and safe.


I have been looking on the forum all afternoon, read the following page http://www.megamanual.com/connect.htm
but no luck, the Usquirt will not stay on for more than 1 or 2 min.

I have checked my +5v, and it seems to be +2.5, very odd


Any thoughts?

[24c]

I have checked my +5v, and it seems to be +2.5, very odd

I have my V2 MicroSquirt powered up and my Vref is connected to my purple/black wire (bootload) and it reads 5.17V on the first voltmeter to hand.

EDIT. I had a similar problem yesterday, but the wire for the bootload switch had broken at the screw terminal, and i couldn't see it.
Are you sure you don't have something pulling the Vref down? Short or faulty TPS etc.

[65looter]

Find attached my datalog and the comm log
can't see what's going on really

[65looter]

Something interesting in the log file, vBatt starts at 13.9v and end up at 24v how can that be possible?

[24c]

It seems every time you get a trigger +- event you get a vBatt spike...I don't know enough to answer, just looking at the Log file. I think it's higher than 24V too...

[65looter]

latest datalog after Matt's recommendations

interWriteDelay = 1 ; Milliseconds delay after each byte when writeBlocks is "on".
to read this:
interWriteDelay = 5 ; Milliseconds delay after each byte when writeBlocks is "on".
Also, if the line above that says "writeBlocks = on" change it to "writeBlocks = off".

I can see the vBatt gauge going from 13.9V to 24V, once it reaches 24V I loose connection with the Usquirt

[65looter]

***SOLVED***

After exchanging a few emails with Matt from DiyAutotune, the problem was solved.
The issue was with my MAP sensor, I have a Y connection on the +5Vref from the TPS to the MAP, and as the MAP was miss-wired.... well you know the rest ;)


Again, Matt you are a top notch guy.
Thanks a lot.