i don't know if sw21 code relates to rev1 or rev2 mr2 turbo. so my
guess is that you have might have an "AP engineering" AFM version. they are plug n play and available as either
revision 1 (early spec '89 - '91 ST185)
or
revision 2 (late spec August '91 - '93 JDM ST185).
>>> 1991 was change over year for minor ECU revisions.
what build month and year is your car, ie what frame number ? > higher or lower than 15446, will determine which ap version you need for pnp. otherwise you might have to do some minor repinning
Air Flow Meter compatible "AP Engineering" modified versions exist for (rev1 & rev2) '89 - '93 3sgte
vs.
MAP sensor compatible revision 3 versions '94 -'99 3sgte
&
MAP sensor compatible AP Engineering modified and ST205 specific "charge cooler control" version for '94 - '99 3sgte
.... i think i may have confused the issue further. :lol:
I would appreciate if you would take a picture of the label and undo the 4 screws to pop off the cover an take some pictures of the circuit board.