Engine/Transmission (1998.5 - 2002) Catchers and half throttle power?????

[Marco]

BarryG,

Attention the codes P0500 and P0501 both deal with the speed sonsor but have a somewhat different meaning.



P0500 = NO Vehicle Speed sensor signal. Pretty self explaining.

P0501 = Vehicle Speed sensor performance.



That's a different beast. The PCM looks if the VSS output makes sense. Example. The truck is in OD. The transmission output shaft is turning at a certain speed. The VSS SHOULD give a certain output... . it does NOT match what it SHOULD be, voilà P0501 is set.



Looks like your VSS is intermitent, or has problems with the plugs or the wires.

That COULD cause some problem(s).



Marco

 

[Walt-L]

I had some time today to install the DTT trans filter box and found the DTT instructions to reset the APPS rather interesting. They claim the only right way to reset the APPS is pull the APPS plug off the PCM behind the air box, find the orange/blue stripe wire in the plug (which happens to be the second pin in from the top right side corner #23 pin). turn the key to on and see what you have for voltage there. I had . 43 v. Then pull the APPS houseing off the upright bracket, exposing the APPS and the white sticker on it with the OEM set voltage printed there. It was . 537 v. Now the way to tune my OFF BUY A WHOLE VOLT... . circuit is you loosen the 2 #20 torx screws holding the APPS in plase and give it a slight turn clock wise and snug the 2 screws, then check the voltage again back at the orange/blue stripe wire. It took me about a dozen trys turning the APPS before I got the wire value up to the . 53 stated on the APPS. The surge isnt as bad as it was before this voltage matching but now I noticed that a very breif 4 second, 31psi, WOT put the pyro at 1200. Thats MUCH hoter now than Iv ever seen it just by a fast punch on the juice! As per Marco's post here, Im hoping the new IAT sens. will kill some of that heat and maybe the rest of the surge. Ill post the results once I get the IAT in the horn. Could it be the heater grid cycling up and down leed to premature IAT death?

 

[R-N-R]

I had the 500/501 codes in addittion to the ABS and Brake light on. ProTurbo99 found a bad connector/sensor in the drives side front wheel.

 

[Walt-L]

Started the truck up this morning and its realy running like crap. Missing and lotsa smoke. So much for the APPS recalibration. Guess I gota sit tight till I get the new IAT in.

9/30/05, As a update, I installed the new IAT sens. today and WOW what a differance. Now the truck runs just fine, altho there is still a noticable surge it seems to be not as a violent rush of power as before. The DTT recalibration of the APPS appears NOW to be a good thing afterall. Amazing how a out of sink APPS calibration to the PCM masked the bad IAT sensor! Useing a extension wire on my multi meter I will test the APPS voltage signal VIA the DTT method from in the cab. This should tell me if the APPS isnt the rascal giving the spikeing voltage value when you let off the throttle.

 

[RAJohnson]

OK Guys after reading all your comments on this thread concerning the IAT sensor and how it might affect the MPG as well as your Catchers, I had to go pull mine for the first time at 78K miles and see if it was in spec. I guess it is OK unless one of you see something different then what I see in these numbers. By the way mine came out looking very clean



32*-30K

70*-10. 5K

72*-9. 4K

79*-8. 4K

102*-5. 5K

110*-4. 1K

115*-3. 8K

120*-3. 6K

128*-2. 9K

155*-1. 9K

160*-1. 5K



Just some #'s to compare yours to. By the way I have never had a code pop up.

 

[fox]

RA, Your numbers look good , as compared to a new one, above 80*.

Below that they are too low. Not as bad as my bad one but I'd suspect it to be causing some issues. Did you notice any difference with the replacement?

 

[RAJohnson]

No not yet, I have to source one today. Could not come up with one over the weekend. I will let you know later after I replace it.

 

[fox]

If you have an O'Reilly's auto parts in town, they have the best $.

 

[RAJohnson]

Wish we had one around here. But we don't I have called every parts supplier around here and no one has one, not even NAPA So I am stuck with the local Lithia Dodge Dealer. They will have one here 10-4-05 for $32. 00 Wish we had better parts stores like you. I will test it before install and post readings.

 

[fox]

I had some time today to install the DTT trans filter box and found the DTT instructions to reset the APPS rather interesting. They claim the only right way to reset the APPS is pull the APPS plug off the PCM behind the air box, find the orange/blue stripe wire in the plug (which happens to be the second pin in from the top right side corner #23 pin). turn the key to on and see what you have for voltage there. I had . 43 v. Then pull the APPS houseing off the upright bracket, exposing the APPS and the white sticker on it with the OEM set voltage printed there. It was . 537 v. Now the way to tune my OFF BUY A WHOLE VOLT... . circuit is you loosen the 2 #20 torx screws holding the APPS in plase and give it a slight turn clock wise and snug the 2 screws, then check the voltage again back at the orange/blue stripe wire. It took me about a dozen trys turning the APPS before I got the wire value up to the . 53 stated on the APPS. The surge isnt as bad as it was before this voltage matching but now I noticed that a very breif 4 second, 31psi, WOT put the pyro at 1200. Thats MUCH hoter now than Iv ever seen it just by a fast punch on the juice! As per Marco's post here, Im hoping the new IAT sens. will kill some of that heat and maybe the rest of the surge. Ill post the results once I get the IAT in the horn. Could it be the heater grid cycling up and down leed to premature IAT death?

While servicing my truck last night, I checked my APPS.

It reads on the decal . 629, then read . 630 on a DVOM. Looks close enough for me!! Again, it runs great, with no surge.

 

[RAJohnson]

Well finally got the new IAT sensor today. Cummins part # 05014197AA Hear are the readings I got before Installing. This should make a difference Oo. (I Hope for the price) :-laf



32*-34. 4K

76*-12. 8K

96*-6. 6K

112*-4. 8K

122*-4. 8K

128*-3. 0K

140*-2. 4K

150*-2. 1K

160*-1. 9K

165*-1. 7K

190*-870 ohms

212*-625 ohms



Hope some of these # help you others figure things out.

 

[BarryG]

Well I installed a new IAT this past weekend and a new speed sensor. Seems like a no go on fixing my surge issue. I was in a real rush to get it done so I did not take the time to test the new IAT or even the old one which I still have. Maybe I will check the old one to see how it specs out.



The speed sensor I replaced did not do any good for my 501 code, wiring looked good as far as I could trace it. I looked up vss (vehicle speed sensor) in my manual and it states that they are no longer used and have been replaced with the rear wheel speed sensor (the one on top of the rear pumpkin). So I replaced it and no go. Still get the code and my grid heaters still dont shut off over 23mph. They just cycle until the time limit has expired. I just noticed a previous posters post about a speed sensor in the drivers side front wheel area. Anyone know anything about that one? Where is it, what is it called? I looked very hard in the manual for any other speed sensors and the only other one it mentions is the one in the rear of the transmission (my speedo works fine, even against my gps).



TIA for any info.

 

[Chrisw]

before my dodge I had a 99 ford powerstroke that had a very bad half pedal power surge. And a friend of mine PSD is the same way. 2 months ago he changed the compressor on the turbo and that helped his truck, it's still there just not a bad. (both truck making close to 400hp to the tires)



My dodge had a surge of power at half throttle back when I had a much smaller turbo since the larger turbo it's not as bad or even noticable.



My truck had a bad chip in the ecm when i sent it in to marco for the mad flash. My truck had a sever cold weather stumble that almost made the truck undriveable, It would have been sold it not for the ecm flash.



My only complaint it a slight miss when towing very intermittent, more like a stumble then a miss. Dosn't seem to do it if I use the cruse botton. And the severely over touchy throttle pedal when driving off road or in low range. I am sure my DonM 4. 8 injectors don't help



Let me end by saying you can have my ecm back when you pry it from my cold dead fingers :-laf

 

[millrat]

In my 99 5 spd there is a surge @ 2000 rpm ,it seems to only happen at wot. Power doesn't drop off though(up to 2k it kinda pushes you into the seat,after 2k it really pushes you,almost like a little shot of nox,up to 3k+ rpm.

 

[BarryG]

TTT

Marco:

I still have not been able to correct my surge issue. Saw your new info about the SMARTY on your new webpage. I sure like the idea of adjustability. And am very seriously already considering upgrading. Do you have any idea if this has a positive effect for those few of us that get the 1/2 throttle surge? Also would you be willing to go into more detail about the ten different levels on the Smarty. Even if you could PM me if you think that it might violate the site rules.

Thanks in advance

 

[Marco]

For a while let's not talk about Smarty here... Let me get the situation straigthend out first.



That half throttle surge. I've just shipped a beta Smarty unit to a customer / buddy who got the CaTCHER and got what I think is that surge. Let's see what he finds out first, then we'll see forward.



BTW. He has 35" tires on his truck. Could it be that such tall tires have some influence on that surge??? What tires are you running?

I have 33" tires and never got that surge though.



Marco

 

[BarryG]

MArco:

No problem on the Smarty info. I am running the stock size tires 265/75/16.

 

[DirtyDodge]

Hi all,



I have the half throttle surge also. I would also like to know if there is a cure for it? Marco or Bob, is this still being investigated?



I have 285/75-16 wich is right at 33" Tall.



Thanks,

Derek

 

[LFJ]

Power surge

I have a 99-350. I got it with 42000 miles on it. Total my new one out. Anyway. It had done this from day one. I have just learn to live with it. I have it down pat now. Also I have the shift thing now . I had the DTT install when I first got the truck. Had to have the thing reprogramed as soon as a had it installed. Now I have 80000 miles on it and it has started with the in out shifting from 33 to 37,and again from 43 to 47 ,and again 53 to 57. I guess that you have to have it doneevery 40000.

 

[Marco]

Marco or Bob, is this still being investigated?

SURE!

I will keep you updated!