In a previous video : https://youtu.be/qzusEscrrmo , we had a look at a Jeep Commander that seem to have a glitch in its software, requiring a "re-boot" in order to get the ECM to turn the #7 injector back on. I test drove the vehicle, exercising the MDS system and could not duplicate the problem. Time will tell. -Enjoy!
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If an SMA Video has helped you out please consider giving using "Patreon" to help support us. The videos take real time to create and pull us away from real work that pays our bills. CLICK HERE: https://www.patreon.com/southmainauto
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Having gone to school to become a IT Technician. A problem is a problem and a fix is a fix. Call it what it is. A reboot is required and a reset is also. But just because it is not a physical problem does not make it anything less than a problem. And it was fixed by resetting the computer. That is something the computer can not do on its own. This is where a Master Mechanic is required and you know that the computer can NOT push the button on its own?
Wonder if there is an ecu update.
I just turned the mds system off in my dodge charger.
My jeep commander with same engine has code P3497 fault on bank 2 cylinder deactivation. I’ve checked the oil which is fine. Disconnected battery to reboot and wipe the code then after 20 miles roughly its back again but engine seems to run ok with no misfires. Any help please?
Illogical Logic !
OK Eric, time to learn coding so you can re-write the ECU software to do an update.
It is possible that the answer is simpler than that. Back-in-the-day when dinosaurs roamed the earth and cars weren't computerized one of the primary tests for any electrical boo-boo was to start at the suspected electrical part and working backwards was to just open and close ever connector enroute. In a surprising number of times the system would work perfectly afterward. As we did 'nothing' the assumption as that was in the line a bit-o-corrosion, just enough to make life interesting. -just sayin'…
Couldn't have put it any better myself…!
OK, I stand by my previous comment. We WILL have to use the old CTRL/ALT/DEL on cars (at least of this era). Eric, you're a smart dude and you will adapt.
But what was the root cause that set all this in motion? Maybe we'll never know
Good video
That is what we computerists call "A bug". I hate the term "bug" – they should be called "monumental cockups" – that would stop people saying "It's just a bug" as trying to get away with "It's just a monumental cockup" makes one look an idiot. And absolutely the right order – any good engineer starts with the least intrusive tests possible, and avoids the "Turn it off and on again" as that loses heaps of info.
well you can write this one off as a learning experience maybe you will see the same thing again someday maybe even this one. You will know for sure the next time. The next time you will make some money. It does my heart good to see someone go to the lengths required to really fix something.
Thanks for the follow up. Hair pullin aint it
Really the only thing you did was maybe move the wires….. maybe thats all intended. LOL Like true thinker you can't go until you figure it out! LOL
Thanks for the follow up
so if the money light always comes on , means it won't pass inspection to get licence plates ?
Did you check for a software update that may address the issue?
After many years in airline tech support, where many of these kinds of glitches are found to be random transients detected by the software of whatever control computer is running the subsystem and where the initial fix is usually to reset the box and see if it comes back, I learned to do with same with my cars and normally will clear an ECU after recording the data, to see if it returns (as long as the fault is something that won't leave me stranded of course). On airliners, "nuisance faults" are very common, that may take months or years to come back once cleared. We had a "reset guide" that flight crews could use to clear common nuisance faults at the gate to avoid taking a dispatch delay.
Time may time .send the video too son in law works 4 Chrysler fiat no replay
You have to love being run in circles for a confused module. The bad thing about these problems is not being able to make any sense of them. My buddy just brought in a 2005 Tahoe with a complaint that the power driver seat up down functions work reverse to the switch input. I laughed at first, then checked it. Nothing wrong in harness, and the memory function has the seat work correctly. Fault is in the module. I suppose a reprogram or replacement is in order, but how does that happen? Too much technology these days. Great video Eric.
Slightly defective logic unit. Try a mind meld next time. Like I said, its all smoke and magic.
Great follow up
too bad there's not a forscan for that Chrysler. Save all the modules setting at first then go back to look at who changed. could be the eproms running the code has a failed memory cell so when the program is running it hits that spot then bingo…. …..mr smith
Eric, i ran across something similar this past week. Had a 2011 Nissan Altima that would not crank at all. Jump boxes were put on it, nothing. Then my boss gives me the car. I took the jump box out to the car with me and checked it out. Sure enough, no crank. Then i noticed no power to anything but the horn and the driver seat. Not even the key fob did anything. Got it pushed into my bay. Tried with my Solus to see if there were any codes. Could communicate with only the intelligent power module, nothing else. Got a code for an external ignition fault. Checked fuses and connectors in the two fuse boxes under the hood, all were good, had power everywhere in them. I decided to disconnect the battery and touch the terminals together. Put the terminals back on, the factory alarm goes off. At that point, power was restored everywhere, the car started and ran normal. Cleared that code, and it never came back. At that point, i was done with it. From what i've seen over the years, the software in the car computers can do the same thing as the pc desktop and laptop software. They can get corrupted and/or lockup. Which brings us to the same solution, resetting the particular computer or a complete battery disconnect. Sometimes, it's just that simple. It would be nice if Chrysler would put steps like that first in the diag procedures. One thing they need to put in, is to do a basic visual inspection. I've run across that too many times to the point that it is what i do first, it's saved me from getting too deep in the rabbit hole.
I know Chrysler ecm systems that vehicle uses a can bus so all the modules are all tied together with two wires. But the real problem you have is he need to flash the firmware to an older revision there by wiping the cache. removing the battery doesn't touch it. It's addaptive learning, it's probably being corrupted do to bad, oil over time. You must wipe the memory on the engine control computer, it may have a separate trans control. Flash it with the current rev or older Rev. Also change oil. Chrysler and Dodge love that adaptive learning technology. It's just a matter of time before they go crazy, and must be cleared by a flash. Code clear is, just a tiny bit of what you can do to the memory management of the ECM. I hate having the dealers analyzers cost so much, but in this case you need it.
Reboot Reinstall Replace……
That’s what we call a bug. There is a problem with the code. I wonder if a dealership PCM update is available.
That Jeep needs a Chrysler MDS delete kit. Remove the complexity and let it be a full time V8.
There ya go. Thanks for the video.
Thanks for the follow up. Great job covering all the bases.
the Jeep is saying " SOON" same light same issue lol
Funny you mention Chrysler computer problems. A long time ago, before 2004, when the Chrysler new castle plant was still operating. There was a robotic arm that glitched out. It ended up destroying the safety cage that surrounded it. Also if your curious the new castle plant made the upper and lower control arms, and part of the steering. So if you have a DaimlerChrysler/ Chrysler Corp. vehicle model year 2003 and older that's where they were made. I also have computer issues with my 03 dodge half ton with the hemi. I hate the Diamler computers.
They call those kind of problems "Gremlins"!
The only other thing changed on this vehicle was the spark plug, when it was removed to install the pressure transducer. Is it possible that removing the spark plug knocked off a chunk of carbon that was shorting out the electrodes? Then the PCM, through its failed logic, automatically assumed that the MDS system was the cause of the issue and flagged a failure there instead of just setting a P0307 code. How can the PCM know the MDS system is malfunctioning when you proved the circuit was fully intact? Maybe there's a trade-off in programming inside the PCM– MDS shut-down cylinders set MDS codes and full-time cylinders set regular misfire codes. It's the only thing that makes sense to me since the PCM can't identify definitively what the cause of the misfire is.
figured as much, I'd still test as such mentioned in 1st video comment.. blazing hot and heat soak it 🙂
just maybe not often enough oil changes and /or a glob of crud blocked a passage temporarily and a hard accel. cleared it, but the "cornfuser" (AVE? lol is set to lock it off to not kill catalyst…..
It's a bad ground! lol
Vantage pro all fixed then, could your snapon guy do software repair on truck if that was the issue . you got 17.4 on it ?
Yeah, sounds like a coding bug. Probably isn't frequent enough that Chrysler felt the need to fix it.
Why patch a calibration glitch on a old car when they will gladly sell you a new one? Give it a while they will start saying eeprom is failing and losing it's programming. Replace computer
I don’t know about better than you
great to always see his curiosity with things that stumps him lol
Dont lose any sleep over it. Most other shops would have used the parts cannon.
maybe the ECM needs a new flash or programming from Jeep? Wonka weird!! lol
Just chiming in. If it comes back and it probably will the mds solenoids can stick mechanically intermittently throwing the code. Seen a few on these back when they were under warranty. You'll probably never get it to fail and they aren't fun to replace
Who is Keith?
At least its not a fly by wire computer controled airbuss airplane.
Excellent video and follow up. I can tell Eric that I seen this before on a 5.7 Hemi Dodge Durango MDS engine. I also reset the Adaptives and drove it for a day. Same results. Again excellent stuff Dr. O
Hey what was that laptop that you use with the pico?
Hmm, Codes are set because it was out of perimeters, why is was set, would be the solenoid just sticks sometimes, or the NVram in the pcs is reading but not writing, im lost tbh