CM 871 won’t regen

[theironoracle]

Lonestar10,

Thanks for that info it clears that up. So the barometric pressure is actually there obviously causing voltage X on both sensors but the computer is calculating X-X so we see zero on imap? Now I want to go back in there and compare the voltage at key on engine off. I realize they may be different if they used different size strain gauges but I have to feed my curiosity.

TIO