x-90 P0335 code

[fixkick]

what great job you did, and passing smog , not easy there. ever.
the PSU wires from a home computer make the ECU A/T 71E21 happy is a great, idea, and TCC , lockup failure, just amazing.

71E21 ,means federal ECU, A/T trans, 1996, 4WD., 2door, car.

doing that pre or 1995 is easy, on any 1996 up, and amazing feat...
in the early years transmission errors are not recorded in the ECU, (TCM only)
in 2wd 5speed manual transmission x90

i think your bad ECU, is not really bad CKP port, but in fact noise caused, the bad ECU has bad caps and the noise on power bus, inside is huge causing the CKP zero crossing detector to misfire. Never seen any ECU blow up and input as they are so well protected with R/C network filters. (baring a lightening hit)
replace all electrolytic caps with very low ESR grade 105F rated caps for best results. (most ECU its only 3 caps)

Congratulations are your hard work that paid off... on old cars with old ECU, RARE. Thanks for sharing too.