This tests whether you're getting proper combustion in each cylinder. So multiple reasons, but this will tell you whether each cylinder is actually producing power.
Wow, had missed this thread. Sucks-->could have been worse. I wonder if it was an issue with the touch screen failure, or a failure of the unit in general. Maybe none of the AFR data (and assuming it gets rpm data somehow as well) was making it to the PCM...
@Scott Danforth , please elaborate on why anyone would install a "do not remove" screw. Much like a "don't press this button" button, it seems like a pretty predictable conclusion in the wrong hands...
Depends on which kill switch we're talking about. I had assumed he was talking about the shift interrupt switch. The Man overboard switch is the one you're referring to...
Yes (at least it isn't stuck closed). The switch is located on a plate next to the shifter. You can see one side of it hooked to the green and white wire.
