Another APPS Problem

[stvncwby]

2001 ram 3500.. edge comp/smarty ..

So been having a problem with a stutter under throttle .. 3/4 ish throttle.. I re adjusted the factory made no difference and tps% was reading 8% at idle 77% wide open .. I ordered a timbo which I think is a rip off but anyways.. installed it now it want read below 13% throttle at idle .. I removed it from bell crank to make sure and still 13%.. so I installed it and when I did the adjustment procedure.. I had to move the idle screw in all way to the bottom to get it to move and now my throttle is around 1/2 way.. yes its int the range it called for 580-700 its at .666 and I moved till it voltage came up and then turned back to volts went back.. throttle feels good and stutter done seem as bad but not with idle at 13% CANT get my high to kick on because of it .also remove factory from bell crank and throttle read 1.6% but when goes on bell crank was 8%..also I can not get my obd reader pickup anything for the iat sensor just says n/a and checked connections all are good

Edited Wednesday at 02:21 PM by stvncwby

[Tractorman]

Do you have any DTC's set, especially related to the APPS?

 

If you don't, I don't think the APPS is causing the problem.  You might try another scan tool just confirm the same readings.

 

Does the engine idle at the correct rpm?

 

I think I would start by checking all battery connections and grounds to make sure there are no issues there.  I would also completely disconnect the Edge tuner and put the Smarty back to stock while troubleshooting just to eliminate potential issues.

 

- John

 

 

[stvncwby]

no trouble codes what so ever even the factory apps didnt give me none.. just cant figure out why reading so high throttle % and also cant get the IAT to read on the obd2 scanner using a different scanner my other one use to read it waiting for my new one to come in now i know will read it.. yea iam try saturday to go thru all the grounds and do the w-t mod been reading up on it looks like a fairly easy task to do.. just didnt understand once i hooked the factory apps up and no on the bell crank read 1.6% but the timbo read 13% thats a big differnce i drove with the timbo on this morning and seems fine no codes and set properly

 

 

[Tractorman]

Since the ECM is the only component that communicates with the APPS, it would be a good idea to re-check connections for resistance and make sure the ECM has a good positive and negative connections.  You will be addressing the ECM ground with the W-T ground reference modification.

 

- John

 

[stvncwby]

yea i will check them again idk why anything would change though and why the timbo is 12% higher whats got me racking my brain.. on or off the bellcrank but the factory lowest i got it on bell crank was 5% and had it throwing low voltage code when i set it to that

 

12 minutes ago, Tractorman said:

Since the ECM is the only component that communicates with the APPS, it would be a good idea to re-check connections for resistance and make sure the ECM has a good positive and negative connections.  You will be addressing the ECM ground with the W-T ground reference modification.

 

- John

 

check restitance you mean ohm the wires out or check for voltage? do you happen to know what voltage for each of the wires should be with key on not running ?

 

[Tractorman]

I don't know the voltages of each wire, but there are two ground connections that can be checked with an ohmmeter.  Both are grounded through the ECM (pins #11 and #32 on the ECM).

 

I would do the W-T wiring mod first, then start with diagnosing the APPS, if the symptoms aren't corrected.

 

- John

 

[stvncwby]

sounds good looking like about 7-10 inch of snow friday so if i can make it home befor then iam going to try and diagnose this do the wt mod 1st then if still exist will continue forward.. trying to get the 0% trottle to make my high idle kick on it worked last year but now this year want with percenatge to high

[stvncwby]

just for testing purposes i checked the noise on the alternator .. volt meter i keep in truck is not the best but works.. turned to acv only 2 settings was 200 or 500 i set on 500 also had a hv out beside it  and it read 035  had heater on wide open and had the radio on also so iam assuming got quiet a bit of noise coming thru them wires on the front of the motor 

 

Edited Wednesday at 09:03 PM by stvncwby

[Tractorman]

1 minute ago, stvncwby said:

turned to acv only 2 settings was 200 or 500 i set on 500 and it read 035

 

200 or 500 volts, or 200 or 500 millivolts?  Your test results:  35 volts or 35 millivolts (.035 volts)? 

 

Need to be clear on this.

 

- John

[stvncwby]

meter doesn't say if its mv or volts just says 200 or 500

also I didn't disconnect the 140 amp fuse or the field wires so iam have to retest this and get the correct numbers

[stvncwby]

Here's is the test results and pictures.. with truck running field lead and 140 amp disconnected everything off in the truck idling it read 000 nothing didn't get feed back till I plugged up the field lead.. same reading if was on 500 was same just 046 & 027

Edited Wednesday at 10:10 PM by stvncwby

[Mopar1973Man]

All your testing are no good. You need a DVM capable of less than 2 volts AC with multiple frequencies, not just 60 hz. A household DVM will do this, which is why your test data is confusing. 

 

Look for a DVM like a Fluke or SnapOn DVMs which are very capable of multifrequencies and voltages less than 2 volts.

 

Just look your DVM has a 200 VAC setting too large. Needs to be 2 VAC or less.

[stvncwby]

Okie ill look at my other meter at the house when i get home tommorow and see what it reads if not ill get my pops he has a fluke or 3. Also the 140 amp and the field lead need diconnected while running to test ?

Edited yesterday at 01:25 AM by stvncwby

[Tractorman]

2 hours ago, stvncwby said:

Also the 140 amp and the field lead need diconnected while running to test ?

 

Incorrect.

 

The purpose of the test is to see how much AC ripple is present FROM THE ALTERNATOR while the alternator is charging.  Just make sure the grid heaters have finished post cycling and that there are no other heavy electrical loads operating.

 

- John

 

 

[stvncwby]

Oh i was going by the old post by moparman that said to disconnect them 🤷

[Mopar1973Man]

Yeah I need to possibly update my articles. 

[Mopar1973Man]

Could you point out that page for me?