MuddFoot Posted March 16, 2014 Posted March 16, 2014 so far this is what i have done. cleaned all wire connectors checked all fuses replaced tcm adjusted tps all within spec.... previous owner says its a 92 tranny but looks just like my 88 in my shop I'm about to just change the harness and see if that makes a difference shifts fine if i shift it manually. its a aw4 4.0 4x4 column shift
carnuck Posted March 16, 2014 Posted March 16, 2014 There are 2 fuses. One in the TCM harness under the dash and the other in the fuse box. It won't stop it from manually shifting though. The fuse holder on the TCM harness in mine was corroded and broken where you couldn't see it. There should be power at that fuse with the motor running. I used a jumper wire before I found the broken fuse holder.
HOrnbrod Posted March 16, 2014 Posted March 16, 2014 Read through this thread. If your AW4 is in fact a 92 (you can't go by looks), this will explain why it's not shifting. http://comancheclub.com/topic/41001-tcu-era-differences/?hl=aw4&do=findComment&comment=414252
cruiser54 Posted March 17, 2014 Posted March 17, 2014 Click on the link in my signature and go to post 10. Try that first.
MuddFoot Posted March 22, 2014 Author Posted March 22, 2014 ok so I'm out here messing with it how would i tell if it is a different tranny everything looks to be 100% same every conector color as my 89 thats in my floor
danbyrambler Posted March 22, 2014 Posted March 22, 2014 Something that recently started or was like this when purchased - - - Have you ckd trouble codes? Here's AW4 FSM lifted from Pirate4X4 - - makes no mention of years covered IIRC. http://www.pirate4x4.com/tech/billavista/PDFs/AW4_manual.PDF & big thread from NAXJA wi links & info concerning years used http://www.naxja.org/forum/showthread.php?t=24701
MuddFoot Posted March 22, 2014 Author Posted March 22, 2014 bought like this just changed all the wiring to the tranny and checked all wiring changed fluid at same time still the same i have power at tps both and its within renix spec per cruisers tips. cleaned every conector on entire jeep I'm about pooped. I'm try another tcu i have power at tcu and one with power leaving the tcu is there any more wires that should have 12v
HOrnbrod Posted March 23, 2014 Posted March 23, 2014 Just because you have power to the TCU does not mean each signal to and from the TCU to the AW4 is showing up on the correct pin. The new 1992 AW4 and TCU have different pin-outs than your original tranny. You need to ID the AW4 you have now by reading the model / serial number, then run the numbers online to ID the year. Once you do that you will need a wiring diagram for the TCU and tranny to match the TCU and AW4 pinouts. Did you read the the link I posted above? The TCU, AW4, and wiring harness all need to be matched. Since your's doesn't shift at all electrically, I'm guessing the solenoid voltage isn't showing up at the tranny. Here's a link that might help: http://www.jeepforum.com/forum/f11/tech-faq-links-tsbs-89273/
MuddFoot Posted March 23, 2014 Author Posted March 23, 2014 the tranny and the tcu are all renix now changed all of it. I'm read through all of this and maybe fix tomorrow
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