Will it Start? Replacing the PCM of my 1997 Jeep TJ
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- Опубліковано 6 сер 2021
- As an update to my vlog on the death of TDSR’s Powertrain Control Module (PCM), this video shows the easy process of installing a new (to me; it’s remanufactured) PCM and then crossing fingers and toes in hopes that my problems are fixed and she starts up again. Let’s just say - nothing with TDSR is simple or easy.
Part 1 of the PCM Saga: • The Brains of my 1997 ...
Project TJ is the chronicling of working on my 1997 Jeep Wrangler. It's the SE version of a TJ with a 2.5L four cylinder and a standard transmission. At the time of making this video, the Jeep had ~204,300 miles on it.
I hope you enjoy! Subscribe to the channel to continue to follow the saga and if you’re interested, you can support me on BuyMeACoffee at www.buymeacoffee.com/edvancise
Part:
Replacement, Remanufactured Powertrain Control Module: www.fs1inc.com/engine-compute...
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Disclaimers:
This video is NOT sponsored by any of the brands mentioned throughout this video or video description. All thoughts mentioned are my own. Some links provided are affiliate links. They do not cost you anything, but I make a small percentage from the sale. Honesty is key on my channel, thank you for supporting me!
I am a Do It Yourself, also known as DIY, mechanic. I am NOT a professional mechanic. I do not have any formal training in the automotive field. I assume no liability for anything you choose to do to your car/vehicle or equipment before or after watching one of my videos. All DIY repairs or modifications you perform are made at your own risk. Sometimes, even if you've done everything the right way, you can destroy or damage one or more things on your car or equipment. You must understand this, but by leveraging knowledge and patience, the probability of encountering one or more problems can be reduced.
Also, if for some unfortunate reason, I do give incorrect instructions and something breaks because you followed my instructions, I will NOT reimburse or pay in any way for whatever cost that may be incurred due to following my wrong instructions.
Lastly, please don't do anything to your vehicle or equipment unless you yourself feel comfortable and confident in doing so. - Авто та транспорт
Check out the video description for extra info, parts, tools, torques, and any updates.
Way to go. Glad the PCM worked. A helpful suggestion from the world of aviation maintenance if I may: If you are going to have stuff disconnected for an extended period of time, make notes, or write stuff down on a tag and hang it from the steering wheel. Things like fuel drained, oil drained, or crank position sensor disconnected. Crutches for faulty memory, like mine. Another hint is look the whole vehicle over before you insert the key. Look for anything you missed and anything that might have happened out on the street. That's life saving in a plane and real darned handy in a car.
Can’t argue with any of that good advice!
Wow! I saw your heart sink on that one. I was so sad for you. Then you plug in the sensor lol! Sooo glad it worked out Ed! Great rollercoaster video for me!
What a wild ride! You'd think by now I'd have learned to 'undo' whatever last thing is that I did so I wouldn't run into these types of heartaches. But, alas, not so much. I'm still good at forgetting that "one extra thing." This was a fun video to edit, not so fun as it was unfolding - hope to devastation to chagrin. But hey, at least it's still running! Thanks for watching and the kind words, Steve!
Wow I was feeling your pain when it wouldn’t start and your face showed it. Woohoo!! on The Jeep running again. Looking forward to your next video.
That was a roller coaster I definitely wasn't expecting. Lesson to be learned - always make sure you reassmble/replug in *everything* when you're done...
Thanks for watching, Carl - got some more content coming down the pipe now that I can move it off the street again.
Great Video! I was sweating with you. Thanks for showing all the steps you did.
Thanks for watching! This Jeep is nothing but a drama queen!
That look of doom! The heartache and the glory. We all know it!
Glad your replacement PCM worked!, I'm going through what you went through now, my PCM just fried and bricked my jeep lol, looking to get a new one now, how was your experience with FS1? I'm looking at them, as well as Wranglerfix right now. Hows it holding up now that a few months have passed? your video really helped me chill out from thinking I was in for a real shit show with this damn computer, thanks!
Not gonna lie, it really freaked me out, then pissed me off at first as well. The FS1 PCM has been great. I think the old one was masking codes though. A week or so after the PCM replacement I started getting O2 sensor codes. I thought for sure the new PCM was bad or something. Turned out that the O2 sensor wire harness was too close to the exhaust manifold. I moved the wires away from it and no codes since. FS1 kept in contact with me after I ordered. IIRC, the first unit they tried to program didn’t work so they had to use a second unit so it took a little longer. But, yes, their unit has been no problems at all.
Thanks for watching and good luck, Gabriel.
Thank you! Engine light for o2 sensor went off after ecu swap on mine also.
I have a TJ 97 2.5 manual, i have a lot of hestiation issues and idle issues, i changed IAC, TPS , Fuel pump , Cranckshaft and more, i also have to reprogram the ECU to ignore the o2 sensor that ECU burn. At this point my mechanic told me that 8 codes can´t be clear and that is why I request a new ECU , i will cross my fingers.
Good luck and I hope the new ECU fixes it for you. Thanks for watching!
Can putting a new PCM in screw anything up??? Mine works still, it just throws a check engine light code, so I can't drive/re register it. If my new one doesn't work, I can just put the old one back in no?
I agree - it should be no problem. Just expect the Jeep "not work" in the same way that it wasn't working that drove you to replace it. The PCMs are VIN-matched and since both would be tied to the same VIN, they should both work fine (aside from any damages/issues within the PCM, if that makes sense).
Thanks for watching and good luck with your TJ!
It possible to reprogramming the old pcm?
Capacitors in the old PCM had failed and leaked, ruining the board. I tried to get it repaired but they couldn’t save it.
There are services on eBay that offer to try to repair your PCM, though. You send it to them and they try to repair it.
hi, Whered you get the PCM?
Hi and thanks for watching. Check out the link in the video description.
Why remove the fuse to the horn?
Great question, Brandon. When I bought the Jeep, the horn didn't work and instead the horn was direct-wired to a rusty doorbell button near my left knee. I tried to figure it out and eventually traced it to the fact that there was no fuse for the horn installed. That's silly - so I popped in a fuse. The horn immediately started blaring. I pulled the fuse and the horn stopped. And...the rest of the Jeep stopped - it wouldn't start or do anything and the PCM needed to be replaced.
My best guess is that the horn wiring between the steering wheel and the horn, which routes through the fuse block and the PCM, has a short in some fashion that ultimately killed some probably very old and weak capacitor in the PCM. The PCM had been replaced once previously and I'm suspecting it might have been because of the same problem I just experienced. After getting the PCM replaced, I decided to just "NOPE" the horn/horn fuse and go back to what Previous Owner had - direct wire from the battery (through a separate fuse) and a switch in the cabin (though nicer than the rusty doorbell of Previous Owner).
Sorry for the long answer but that's the story (and in writing this after all that time I realize it's still a slightly traumatic memory - LOL!).
Yes, I absolutely could go through the wiring and trace down the exact problem but I'm skittish about it now and with this old of a Jeep, just letting it stay in what it seems to think is its happy place.
@@CarbonsDIYGarage only questioning because im a technician and a customer brought in their 97 TJ with a intermittent issue with a no start. after tapping on the pcm it will start. runs great everything works fine but we decided to order a replacement pcm to fix his issue. i installed the new pcm and now i have a crank but no start. i was looking for help on youtube and came across your video and started thinking maybe this customer had an issue with their horn as well becuase they have a aftermarket steering wheel installed. so today i removed the horn fuse just for the heck of it and still crank no start. scanned vehicle for codes with only 1 code being an open squib circuit code for the driver airbag. i removed the new pcm and installed the old one and it starts instantly. still has the 1 code in it. im wondering if i may have got a bad pcm from the supplier. a real bummer. the orignal pcm has a reman sticker date of 07/22 so fairly new. i decided to crack it open after watching your other video but this unit looks nothing like yours, the entire board is filled with what looks like some sort of epoxy resin so trying to see if any resistors or capacitors are burnt or blown is impossible. looks like i will need to send back the new pcm and hope a replacement fixes it
@@brandonf5625 That is so bizarre. I guess my thought too would be that the “new” PCM is bad.
It’s interesting on how the innards are so different looking. Electrical gremlins are such a pain!
New pcm cost to much, you know the cheepest price where I can get cheaper then 1000?
Link in the video description for the part I bought. Way less than $1000.