Mystery ECU pressure sensor...?
Posted: Sat Feb 11, 2006 5:55 pm
Hey hey.
Just got a pair of what are supposed to be N/A ECUs for their connectors and am puzzled upon taking the first one apart:

What the fork is that?? There's a hole on the back of this ECU where this thing is aimed. The entire circuitboard's sole purpose appears to be driving this thing, which I suspect is some sort of pressure sensor.
Did some Legacy ECUs use a board-mounted atmospheric sensor instead of sharing the MAP sensor under the hood? The other N/A ECU I have here does not appear to have this strange piece of aircraft-grade technology.
The sensor itself is a thick film hybrid microcircuit - on the exposed thick film (on the top) I can see laser-trimmed resistors. Highly accurate stuff. Overkill, in fact - which does agree with Subaru's engineering practices.
Anyone know for sure what this is and what it's for?
Just got a pair of what are supposed to be N/A ECUs for their connectors and am puzzled upon taking the first one apart:
What the fork is that?? There's a hole on the back of this ECU where this thing is aimed. The entire circuitboard's sole purpose appears to be driving this thing, which I suspect is some sort of pressure sensor.
Did some Legacy ECUs use a board-mounted atmospheric sensor instead of sharing the MAP sensor under the hood? The other N/A ECU I have here does not appear to have this strange piece of aircraft-grade technology.
The sensor itself is a thick film hybrid microcircuit - on the exposed thick film (on the top) I can see laser-trimmed resistors. Highly accurate stuff. Overkill, in fact - which does agree with Subaru's engineering practices.
Anyone know for sure what this is and what it's for?