You might could use an auto for a manual, but not the other way around. If the ECM tells the trans to shift, but it's not hooked up to an auto trans then what could it hurt? Just random thinking, maybe someone else knows better.

 

Exact same symptoms with a Member on TDR and it turned out to be the ECM.

http://www.turbodieselregister.com/f...r-problem.html

Merrick

 

I have had some ECM troubles...here are two of my posts that may help you

https://www.dieseltruckresource.com/...d.php?t=188332

https://www.dieseltruckresource.com/...d.php?t=157169

 

The thing with my truck is that it will run perfecty fine until i drive it.. I mean sitting there i can rev it up and everything its fine until i go down the road then it start up its non-sense. Like i guess it seems when i build some boost is when i first notice it messing up then after that the coolant temp and oil pressure guages go crazy then it revs up... Like i dont have to have my foot on the pedal at all i can get out the truck and it will sit there at 2000 rpms. On my snap on scan tool i ran live data when it does the reving up thing it read apps % ... like im pushin the pedal down but Im not...

 

I had the same problems, and it just happened to be some loose wires going into the ECM.

All I did was just push all the wires into the ECM harder and it fixed it right up....

Merrick

 

It was just running alittle messed up like a bad sensor or something and it threw a APPS code so i replaced that and the map sensor becasue the apps wouldnt mess up it seemed only until i was driving with boost so that the reason for the map sensor. it didnt have dead spot and never reved up like the way it does now and the guages never went crazy until i replace the APPS and map sensor.??????

 

I have a 2001 Dodge Ram 2500 with a Cummins Diesel with automatic.

The problem is that the vehicle typically runs fine until shifting into 4th gear and/or overdrive. Often, but not always, in those two gears the engine experiences repeated extreme hesitation ( to the point that you would think the engine shut off). Most of the time the problem exists between 50mph and 70mph. It will be running fine and then lose all power for a few seconds and then comes back. I have spent over $4,000 on the problems and do not wish to continue replacing expensive parts to no avail.

I believe I need a new ECM but due to the cost would like to know if there are some basic diagnostics I can perform to determine the if the problems are actually the ECM. I thought the transmission was the problem and AAMCO agreed with me. They did a complete tranny overhaul but the problem persists. Then they suggested I replace the APPS and the PCM. Reluctantly, I followed their advice but the problem remains. I exchanged both the APPS and PCM twice (so I’ve had a total of 2 new of each of them installed) but the replacement units have not corrected the problem.

Note, I have a scan tool and there are no problem codes. I have recalibrated the Apps over 100 times and it will appear that the problem is corrected but after 10 to 20 miles of driving the problem returns.

Can anyone offer any suggestions of how I can be more confident that the ECM is causing the problems?

 

have you cleaned all your grounds and battery connections?

 

I second double checking, or even adding a ground to that circuit. If it only happens when the OD or TCLU circuit is engaged, then something on those 2 circuits is dragging more power than the current ground will handle.

I would start checking and adding grounds wherever there is currently one.

 

Yep...ck and clean grounds!
Under the driverside batt, 2 on the pass inside fender by air filter, firewall by PCM, wrap the large wire from the alternator w/foil then elec tape and make sure all batt connections are clean and tight. After that crawl under the truck and clean/tighten every connection you can find and make sure the tranny plugs are good.

 

okay so this is all i got that you can look into on ecm or issues with AUTO.
This is off of TIMBO's APPS website.

Many auto trans owners experience rapid torque convertor locking and unlocking. This CAN be caused by a faulty APPS sensor. BUT often times is caused by the DIRTY CONNECTIONS or alternator leaking AC current into the APPS circuit. I have included 4 links to educate you on other possible solutions to the problem. I'm not a "Parts Pusher".The first link is how to install a torque converter lock up switch

http://www.tstproducts.com/Torque%20...p%20Switch.pdf

http://www.trnw.net/estore/catalog/p...products_id=30

https://www.atsdiesel.com/PDF/120505...%2047%20RE.pdf

http://www.cumminsforum.com/forum/98...-hunt-fix.html

and below is info on ECM and where to go if you do need a new/rebuilt one that is tons cheaper than the dealership.

https://www.dieseltruckresource.com/...d.php?t=316394

 

One other thing, check the small plug coming out of the back of the alternator. Make sure it's clean and no breaks in the connection as this feeds a 12v signal ( i think the blue wire)to the ECM for proper tranny shifting. Afer all you have done and knowing how finicky the 2nd gen is on grounds, I'll bet it's a ground/wire issue. Good luck!!!

 

Did you replace the injection pump relay or swap it with another relay yet? I have seen relay cause many problems often last part to be replaced.

 

Getting numb from all the checking with no results but am determined to get to the bottom of this. have over 1,000 miles since the last post but nothing has changed. I keep thinking it is going to leave me stranded but not yet.

The injector pump relay is the one in the main relay box that is simply marked "Fuel", right? Just feeling a little unsure of my diagnostic ability these days.

 

Joey,

I'm reading through old posts dealing with my own truck issues and your symptoms listed here are about identical to mine. Have you figured it out yet? I'm only at about $2500 in parts and diagnosis so far. Anything additional you can pass along is much appreciated.
Pete