'95 Maxima. i've checked the onboard diagnostic from ECU dozens of times. suddenly without forcing, the screw (which is rotated so the check engine light will flash the codes) doesn't hit a stop point. i had rotated Clockwise to the stop point, then was rotating Counter-CW, but the screw kept turning without hitting a stop. the screw seems to be effective for getting the ECU to flash the codes (and i assume to reset ECU. both stop points are non-existant now). can someone confirm a few points?
how can one determine where the screw is set?
normal rest position was screwdriver lined up at 10 o'clock. i would turn CW 1-1/4 turns and hit the stop at 2 o'clock (roughly 450-480 degrees of rotation). pause two seconds, then i'd rotate CCW 1-1/4 turns to 10 o'clock, wait five seconds, rotate CW again, pause, rotate CCW again and read the flashing codes. (objective here is confirm 1-1/4 turns is correct?)
i've noticed at some position the screw causes the idle speed to be slow (400 RPM, press accelerator idle increases, release accelerator/engine stalls.) rotating screw to a diff position, idle is normal.
can someone comment regarding how the screw functions, as to whether there are only two positions that affect ECU operation? (i've read another post which said the stops for the screw are a simple mechanism made of plastic).