new neutral saftey switch installed. full function (same as old) verified for starting in P and N, no where else. no backup lights still. Still gives Trans code and Range sense code.
bench tested purge solenoid for proper resistance and function. Verified continuity from purge solenoid plug to ecm pin- ok. no power on other side of purge plug with ig on or off.
found fuse missing in kick panel that supports backup lights, purge solenoid, o2 circuits. put fuse in.
now have power to purge, backup lights work for first time since owner ship.
multiple code clears, still have same 3 codes for trans malfunction, range select malfunction, purge sol circuit error.
purge solenoid feels like its trying to softly kick, but no where near the bench testing click.
suspect ECM driver bad.
no idea on trans codes.
Replaced fuel sending / pump module. fuel gage works so far.