by Merp » Sat Mar 28, 2009 6:42 am
Did some more testing today.
When my adapter isn't hooked up to the ECU, everything reads:
VCC: 5v
GND: 0v
TX/RX: 5v
WDS: 0v - 5v Square Wave @150Hz.
All this looks fine to me, I'm not sure what the TX/RX lines should read though.
Anyway, when soldered up to an ECU, things change.
Vcc => P405
GND => P413 => ECU pins D1,D2,D3,D7,A5 (connecting adapter and ecm grounds as Colby mentioned on OpenECU)
TX => P409
RX => P411
WDS => P407
This is while running:
12V POS => ECU pins B5,B19
12V NEG => ECU pins D1,D2,D3,D7,A5
I get the following readings with or without the 12V source applied
Vcc: 5v
GND: 0v
TX: 2.5v
RX: 2v
WDS: 0v - 2.5v Square Wave @ 150Hz
So, it looks like the ECU may be broken, or the pad numbers aren't corresponding to the proper CPU pins. I found a spare 04 STi ECU to test, will see how that goes, and I suppose I could scrap one of my ecu's to trace the pads if my cable is indeed working.
Can anyone who's sucessfully booted an ECU post the above readings when connected?
Thanks!