08-02-2016, 05:01 PM
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95 cherokee country aw4 trans not shifting auyo
AW4 trans, inline 6 4.0, 160k miles, engine runs great, trans not slipping. trans started irregular shifting at same time the speedo stopped working. now it wont up or down shift automatically.
what ive done/replaced
TPS tests good, but I only get a WOT reading of 2.1v. it has 5v pwr to it, .7v at closed throttle.
replaced IAC cause it needed it.
MAP tested good.
shift solenoids good.
replaced VSS, old one no readings, tested new one before install and has power, all good.
swapped TCU with one from salvage yard (no guarentees that one was any better) no info on bench testing it.
checked all fuses and relays multiple times.
was unable to locate so called "TCU inline fuse".
NSS is dirty externally but no indication that it fouled out.
so where im at with this is;
ground problems I have found yet.
re test VSS.
check if TCU is getting power. haven't figured that out yet.
swap TPS? don't want to just throw parts at it, been down that road without success.
if anyone has any ideas or direction to go with this it would be great. thanks in advance