Hi Vince
No, what happens is that, on start up, the highlighted pattern of ABS warning light flashes always happens (for ignition on, and start up), and then the ABS warning light goes out. After that, it usually stays out (about 3/4 of the time) and whilst it is not on, the brakes work properly and the anti lock function works (I have confirmed this numerous times on a wet, quiet, dead end side street with a sudden brake application from about 10kmh).
About 1/4 of the time, after setting off, the ABS warning light will come on after a random period of time (maybe a few minutes of driving, maybe an hour) and stays on, and when it is on the ABS function no longer works (also confirmed), though the brakes still work (of course!!). If I am driving along and the ABS light comes on, I can make if go away by turning the ignition off and on, the ABS light may not come on again for the rest of that trip, no matter how long, or it might come on again within a few minutes, there is no pattern that I can detect. The best I can come up with, after lots of reading and doing the things I have listed, is the G-Force sensor, hence my query
On another note, I have finally got hold of some EVO1 wheels, so I will be able to finally fit up the EV01 front brakes I bought off you!