03whitegsr

iTrader: (8)

Ceddy, thanks for looking more at it. I didn't think it made sense for them to use the cam signal for timing events, but I just was not sure at all.

One thing though, I don't think it's looking at the falling edge for scheduling timing advance. The falling edge happens at 5* BTDC. If your timing advance is more then 5 degrees advanced, it would have to know the crank position before it measured it. It seems it would have to look at the raising edge of the crank signal, which happens around 72* BTDC which would give it plenty of time to figure out the timing delay even with 40 degrees of advance.

I do imagine it looks at the falling edge though and likely uses it for other things, like misfire detection and fuel phasing?

I'd have to see how close they are to each other, but I do see a situation that could confuse the ECU and make it think cylinder 4 was cylinder 1. It would throw off the fuel phase but really shouldn't have an impact on timing advance.