Aw4 not shifting

[jons87mj]

Hi I got a new mj and the trany shifted great but the other day I powerwashed the underside of the jeep and now the trany don't want to shift like it did befor. It shifts at higher Rpms :help: any help would be great thanks Jon

[deziped]

I"m thinking you probably put the spray on the Neutral Safety Switch on the side of thr tranny and it found a way inside the switch to ground out a gear switching solenoid. Go to this site to get info on testing the NSS without taking it apart.: http://www.cherokee-jeep.com/1-2swremov.htm I haven't been there since 2006 so hope its still there. Should be 4 pages of info on diagnosis of the AW4 tranny.

[cruiser54]

Didn't get the TPS wet did ya?

[jons87mj]

Thanks :yes: I had know idea that the neutral safety switch did all that. But I'll test and probly have to clean it tomarrow.

 

And it may of got mist on it but I never put water right on it

 

Thanks for the help I'll try this and let you know how it works out :wrench:

[jons87mj]

Will I cleaned the neutral safety switch and it still the same. I had a scan tool put on the truck and it said

1 The brakes were on and the trany was in 1

(the brakes were not on and it was in park) :dunno:

2 the tanny was not getting an rpm reading?

What sould I cheak now? The crank shaft sinser?

[HOrnbrod]

Check the plug, connector, and wiring on the speed sensor, left side of the tranny, on the AW4 transmission extension piece.

[jons87mj]

Ok I got the plug on the fire wall cleaned and the small white plugs on the side of the tranny clean. Nothing's changed :headpop: is the speed sensor replace able and what does it look like?

Thanks Jon

[ParadiseMJ]

The speed sensor is replaceable. Don't have a pic. It's a rubber plug with a 90 degree (inside) sensor. Outside it just looks like a thick wire with a plug.

about as long as a spark plug...almost looks like spark plug wire...at the back of the trans, like said.

[jons87mj]

Got it fixed the tps was bad. Replaced it and the truck runs and drives great again :yes:

Thanks for the help :cheers:

[cruiser54]

So you did get it wet!!!

[jons87mj]

yes :oops: i would say so but never thought it got that wet

[PCO6]

This is an old post but I thought I'd bring it back to the top because it was a big help to me.   I was planning to take my MJ into Krown Rustproofing yesterday.   It's generally a good idea to have the underside washed so the "slime" they apply sticks better and doesn't trap in dirt, etc.   I took it through a car wash.   I've done this before with my other jeeps (XJ, TJ & LJ) and have never had a problem.   Right away it wouldn't shift in to 2nd gear.  I figured water might have got into the NSS (didn't think of the speed sensor).   I never thought that water would make it all the way up to the TPS but that's what happened.    Anyway, I replaced it and all is good.   I'll go over the NSS and speed sensor too ... because I'm sure they'll be the next to go.

 

Thanks for the tips!