dead pedal

[wwilson1900]

My truck (2000 2500 automatic w/103K) has a bad case of dead pedal.I went by Autozone and had them read the codes and the only one was overboost.I cleared it and none have returned.It also has a fairly new fass ddrp lift pump on it.Once in a while it wil take off like normal for 2 or 3 presses of the accelerator; then just return to the same old dead pedal.Can the APPS be checked with a digital volt meter?Any other ideas? probably VP44?thanks in advance.joek

[Mopar1973Man]

Check for error codes.P0121, P0122 or P0123 is a APPS failure...P0216, P0251, P1688, P1689 is a VP44 failure...

[cummins2k]

Well sorry to cross link forums but here is a good write up on the APPS that will take you deep into the guts of it. http://www.cumminsforum.com/forum/98-5-02-powertrain/54322-anatomy-apps-last-post.html

[Dave3500]

Cummins2KDid you make one?Dave

[Dave3500]

I forgot to thank you for posting that link, I did bookmark.Michael, doesn't someone on your site or that you know make an APPS replacement? Are you running one? :confused: Thanks again,Dave

[Mopar1973Man]

Here you go... http://mopar.mopar1973man.com/cummins/2ndgen24v/apps/apps-replacement.html

[wwilson1900]

thanks for APPS article.I'm not getting any error codes.

[Mopar1973Man]

Well APPS sensor when it fails it will ALWAYS throw a P0121, P0122, or P0123 error code... Since no error codes are present then it most likely going to be you VP44... 8| http://www.bluechipdiesel.com/vp44diagnostichelp.html

[cummins2k]

Cummins2K Did you make one? Dave

No I didn't but it looks simple enough I am sure it wouldn't be much to tackle in an afternoon.

[wwilson1900]

YIKES, that's what i'm leaning toward though.thanks for your help.

[Mopar1973Man]

Sad but true... APPS sensor ALWAYS throws a code if it fails even only for a split second.

But a failing VP44 might and might not trip a code at all but throw a dead pedal at you...

[wwilson1900]

It turned out to be MAP sensor and cam position sensor.Both were not reading according to the mechanic I took it to.Thanks for your help.