leidichdanny

I have a 1996 Jeep Cherokee, its an automatic. I am able to shift the transmission manually but I would like it to shift automatically, like any auto should. I'm thinking it is the transmission solenoids, I have cleaned the neutral safety switch. That fixed the reverse lights. But no luck on the tranny, any words of wisdom?

cruiser54

Solenoids can be tested in the vehicle.

do this first:





Over near the transmission dipstick tube are 2 rather large connectors. One is black and goes to the NSS and the gray connector goes to the transmission itself
. These 2 connectors carry all the info between TPS, TCU, NSS, speed sensor, and transmission solenoids.

Unplug each one, visually inspect for corrosion or bent pins, spray them out with electrical contact cleaner and plug them back in.

Additionally, if your Jeep is an ’87 to ’90 Renix, it’s always a good idea to reach up under the glovebox area and unplug the connector to the TCU and spray it out along with the receptacle of the TCU. While you’re there, find the fuse right in that area for the TCU. Remove it and spray out it’s receptacle and clean any corrosion from the fuse.

Revised 1-31-2016

DingoGoneWild

Same problems here. I will try this. Thanks!