2002 3500 Cummins

Joe Mechanic Annapolis, Maryland Posted   Latest   Edited  
Question
Propulsion
2002 Dodge Ram 3500 5.9L (5) 4-spd (46RE)—3B7MF33632M267327

hey I need help I have a 2002 dodge ram 3500 5.9 cummins and when driving around 40mph to 50mph the engin keeps reving up and down, from about 1100 rpms to 1500rpm and it does it fast and Jenks the truck. Onice u hit 52 mph it stops or get below 40 mph it stops

0
Johnny Owner/Technician
Kissimmee, Florida
Johnny Default
 

Hi I did have a similar problem with a 2005 I replace the power steering pressure sensor

+1 Default Ð Bounty Awarded
Kevin Owner/Technician
Weatherford, Texas
Kevin Default
 

Torque converter lock/unlock due to an electrical noise issue on the truck. Go drive it and look at converter lock/unlock. It will most likely coincide with your issue.

0 Default Ð Bounty Awarded
Dave Mobile Technician
Ironton, Ohio
Dave Default
 

Most likely you are spot on. I just want to add a warning that if he is using a S.O. scan tool it can cause a converter lock and unlock situation s on early model Chrysler products.

0 Default Ð Bounty Awarded
Joe Mechanic
Annapolis, Maryland
Joe Default
 

I'm my snsp on versus

0 Default Ð Bounty Awarded
Nate Owner
Santa Cruz, California
Nate Default
 

Torque converter trying to go into lockup? Try driving in one gear lower and see if that eliminates or changes the symptom.

0 Default Ð Bounty Awarded
Kevin Owner/Technician
Weatherford, Texas
Kevin Default
   

The torque converter should lock around 42-45mph as commanded. The converter is unlocking/locking when it should be locked due to noise /excessive voltage drop in the system. This is a known issue on the 47re transmission with the Cummins engine. It is possible it could be something else, but this is classic symptoms of this condition. Watching the converter lock/unlock on a scanner should clear…

0 Default Ð Bounty Awarded
Nate Owner
Santa Cruz, California
Nate Default
 

I am definitely not familiar with these trucks. I was just responding to the symptom. In some European cars, the symptom can be caused by pressure loss inside the transmission. The lockup command is issued electrically, but there is insufficient hydraulic pressure to hold the lockup clutch engaged, so you get the lock - unlock - lock - unlock cycling symptom.

0 Default Ð Bounty Awarded
Joe Mechanic
Annapolis, Maryland
Joe Default
 

Thanks, I'll start from there lol atleast I have a starting point now

0 Default Ð Bounty Awarded
David Inspector
Benicia, California
David Default
 

I'm sorry my memory is getting bad. Is this a common rail engine or the inside pump engine. The reason I ask is on the in line pump engines there was an issue with rust in the throttle position senosr that would send an erratic signal locking and unlocking the converter. If it is the inline pump, scope your tps signal for spike while moving, if any are present replace it and retest.

0 Default Ð Bounty Awarded
Joe Owner/Technician
Gilbert, Arizona
Joe Default
 

Most likely converter lock and unlock As others have said. Clean the battery cables very well and then isolate the brown/black wire from the alternator to the battery, wrap in tin foil and electrical tape. Sounds rough but it can look clean if done with care. Fixed multiple Old dodges like that.

0 Default Ð Bounty Awarded
Michael Owner
Othello, Washington
Michael Default
 

Been there done that. It’s alt noise. Separate the power wire at the alternator from the loom. Reroute to the the top of the radiator. There is enough room if you open the wiring across the motor. Not my discovery but have fought that problem many times and that is the fix. FYI the factory pit foil on that wire so they must have figured it was a problem. Nothing like building a trans only to…

0 Default Ð Bounty Awarded
George Owner/Technician
Skagway, Alaska
George Default
 

What I've done with mine is check for codes, clear the codes and then KOEO pedal to the floor slowly and back up again slowly. It re calibrates the APPS/TPS. This has fixed mine twice. THE 3RD time it took a new TPMS. It sounds strange and almost unbelievable but it worked

0 Default Ð Bounty Awarded
David Diagnostician
Independence, Louisiana
David Default
 

It is the torque converter engaging and disengaging. This was a common problem with the VP 44 pump engines. First, clean all your battery connections, especially the ground cables. Second, there are two small wires coming off the passenger battery from the negative cable. One goes to the PCM case and the other to the engine. The two wires have connectors in them. Cut the connectors out and…

+1 Default Ð Bounty Awarded
Kevin Owner/Technician
Weatherford, Texas
Kevin Default
 

Everyone seems to be missing the purpose of this forum, here, in my opinion. He has not diagnosed the problem, yet. Just throwing out solutions that may have worked for you in the past without actually diagnosing the issue is not diagnostics, is it? Get your scope on the appropriate circuits and verify where the voltage drop/noise is coming from. Let the data you discover drive the diagnostics…

+1 Default Ð Bounty Awarded
Rob Mechanic
Commerce, California
Rob Default
 

Monitor the tps signal for drop outs, I have seen this occur on a 99 ram 5.9l.

0 Default Ð Bounty Awarded
Mike Owner
Cromwell, Kentucky
Mike Default
 

I normally graph the ac ripple on the alternator and graph the tps, but there is a plethora of things that cause this on these trucks. I'll attach a file concerning most of them.

0 Default Ð Bounty Awarded
Louis Mobile Technician
McQueeney, Texas
Louis Default
 

- Have had this issue in … units Most common, bad grounds. Adding a ground from the Transmission case to the Chassis helps most of the time. Next most common: A faulty Alternator. Even though the Alternator was putting out the correct voltage, there was a triode or regulator issue throwing a odd sine wave throughout the vehicle electronics. Specifically the transmission. I know keep a…

0 Default Ð Bounty Awarded
Mark Engineer
La Junta, Colorado
Mark Default
 

Joe Others have already explained what the typical pattern failure is. I had the opportunity to talk to the group in Canada that fabricates a wonderful noise filer. The product is called the DDT noise filter. Here is what the engineer from Canada explained: The wiring loom on the Cummins engine has the TPS wiring taped in the same harness with the alternator charge wire. Due to magnetic flux…

0 Default Ð Bounty Awarded
George Owner/Technician
Skagway, Alaska
George Default
 

At one point some company was selling something similar. It was a twisted pair of wires that went on the TPS somehow. I don't remember the exact way it was wired. My 1st dodge was eating a TPS ever 6 months give or take and the trans shop put one of those on for me. It didn't solve the problem. Going through all of the ground wires helped a lot especially the ones under the passenger side…

0 Default Ð Bounty Awarded
Kevin Owner/Technician
Weatherford, Texas
Kevin Default
 

DTT may be out of business, but if they aren't, their products are hard to come by. BD Diesel makes an inexpensive piece noise suppressor made for this application. I liked the old DTT boxes, but haven't seen them in quite some time. If you scope the circuit, you can also make your own specifically for the noise on that circuit if you are so inclined and have access to the basic electrical…

0 Default Ð Bounty Awarded