About a year a go Dohmar, jrm and myself had a bit of a discussion about consult in another thread, specifically HICAS.
Tonight I was bored enough to whip everything out and have another play around, I can initialize the hicas ecu fine and went on to scan registers 00 through FF, but this only returned 1 valid register, 0x01 which seems to be a speed sensor. So perhaps on Skylines we don't get the extra diagnostic information available on the 300zx ecu (steering angle), or maybe my hicas ecu isn't happy, or maybe i'm just wrong.
If anyone is still interested in investigating this, would you like to scan for registers, and post up your results?
I Used OBD Scan Tech as it already has the function to scan for registers, and lookrs232 to manually send commands to the ECU.
Scan Tech already has init strings in it, but if you want to manually address the hicas 'FF FF E4' will get it talking, '5A 01 F0' will start it streaming sensor data for register 0x01 and 0x30 will make it stop.