[Anabolic]

got the p0122, I took the tps off confirmed my voltage tp be .542, calibrated it. got rid of the horrible torx bolts. cleared the code and got dead pedal again...

any way of saving this sensor or do i need to take the plunge in my pocket/

 

[Anabolic]

do you adjust the voltage with the key on engine off or just key off totally? I'm reading different things.. is there anything to confirm the .545v im adjusting it to??? is this the remove negatives, pump pedal thing?

my friend is saying do it this way... exact sequence..

1. remove negatives from batteries with key on
2. pump gas pedal 10x
3. re-connect batteries
4. set/adjust TPS sensor to my .542 volts
5. pump pedal 10x again
6. start truck

is that correct?

 

[Mopar1973Man]

do you adjust the voltage with the key on engine off or just key off totally? I'm reading different things.. is there anything to confirm the .545v im adjusting it to??? is this the remove negatives, pump pedal thing?

my friend is saying do it this way... exact sequence..

1. remove negatives from batteries with key on
2. pump gas pedal 10x
3. re-connect batteries
4. set/adjust TPS sensor to my .542 volts
5. pump pedal 10x again
6. start truck

is that correct?

No voltage Adjustment!
Mopar1973Man's Dodge Cummins Articles - APPS Sensor Voltage Adjustment

The fact is that the stock APPS sensor is a rheostat yes. But APPS sensor is set at a particular voltage for the electronic switches inside that reports to the ECM if it at IDLE or THROTTLING. If the APPS sensor voltage rises above the voltage listed on the tag the switch changes to THROTTLING. Then when the voltage drops BELOW the voltage on the tag then the ECM switches to IDLING. This means the APPS sensor voltage is disregarded and idling software of the ECM takes over control of the Bosch VP44 injection.

NOW... The Timbo APPS sensor... There is no set voltage tag because the switch for ON IDLE and THROTTLING is mechanical this means once the APPS sensor bellcrank gets to a particular angle THROTTLING starts regardless of voltage. So there is no voltage to adjust the APPS sensor to just a matter of taking the slack out of the APPS sensor bellcrank.

So now you know why you DON'T set the APPS sensor for EXACTLY the tag voltage because now the APPS sensor idle validation switches will constantly flip back and forth between IDLING and THROTTLING causing issues with exhaust brakes, high idle software, etc.

It's not about the voltage, it's about the fact of the APPS sensor Idle validation switch state...

Problem #1 - Voltage on label

Everyone is trying to hit APPS sensor voltage dead on what's on the tag... DON'T! This is the voltage that the APPS sensor goes from ON idle start to OFF idle state. You voltage MUST be BELOW this number.

Like on mine the APPS sensor voltage is .519. Don't set the voltage at this set it below this mark say .480 to .490 because as you add in voltage gain or loss during normal operation of the truck it might cross the mark and go off idle and you end up with idle set at 950 to 1000. Then find out your exhaust brake, high idle and a few other things don't work!
WARNING! STOP! Don't set the APPS sensor voltage to the voltage on the label this is WRONG!
Like the Timbo APPS sensor you adjust to to the point you cross the dead zone and back off below this point 1/2 turn. Reason why is to keep the APPS from accidentally going to OFF idle state. As long as the voltage in the APPS sensor is below this state the the ON idle signal is given to the ECM and the APPS signal is basically ignored and idle programming is used.

Now if the alternator or voltage of the system change a little bit you going to have issues of the voltage crossing back and forth over this boundary. Please set your voltage BELOW what on the tag by about 0.2 volts to insure the voltage is low enough to put the APPS sensor in ON Idle state. If this was my truck to set I would set the voltage for .480 volts at the APPS sensor plug.

 

[cummins6sp5.9]

Mike you are talking a out the stock apps or the Timbo apps ??

 

[Anabolic]

mines .542 would .500 flat be advisable? what about this "confirmation" process to reset and learn the new adjustment?

 

[Mopar1973Man]

Mike you are talking a out the stock apps or the Timbo apps ??

Timbos there is no voltage adjustment. Stock there is but you want the voltage to be below the tag number.

mines .542 would .500 flat be advisable? what about this "confirmation" process to reset and learn the new adjustment?

I would even go as low as .400 and not worry. It just gives some slack to the APPS kind of the same way the Timbo's works. But as for your P0122 this might not even fix this problem because of a wore spot in the rheostat.

 

[Anabolic]

is there anyway of fixing this? or well. confirming this new adjustment? or do i not have to confirm anything and worry about it

 

[Mopar1973Man]

I would do the diagnostic.
Mopar1973Man's Dodge Cummins Articles - P0122 APPS Sensor Signal Voltage Too Low

 

[Anabolic]

I will check this, it seems to be an intermittent problem. When i let the truck sit overnight, adusted the voltage I got throttle felt like it was sputtering under light acceleration. then i got to my destination. I got the check engine light again. re-adjusted the sensor.was fine again, i went to go take off instantly lost the pedal again and got the code...

would this sound like a dead spot on the TPS? if there was a break in the line somewhere or some issue electrically I could see it just not working ALL the time?
wouldn't know how to fix it if I did have a grounding issue anyway

edit: remebering the first time after the truck sat all night i adjusted it to the spec i actually got it alittle lower .52 and it idle'd really high like 1200 or so. I ended up actually driving with .33v just to idle where i should to my destination. wasnt .55.. when i got there the truck died i re-adjusted to spec .55 and didnt do anything....
Sounds like a bad sensor right?? is there any way of repairing these? I read you can drill a hole or something? clean it?

Could I just peel the top off and clean the insides or no

 

[bigfish95971]

Sounds like you are trying to do he APPS reset and what your buddy told you is all wrong.
What you want to do is disconnect the batteries and leave the key on for an hour or overnight. Turn key to off. Connect batteries. Turn the key on three times to run/on, not to start, leaving it on the third time. While key is on slowly depress accelerator pedal and release slowly. Turn key off. Start and check throttle. This has also worked by doing everything the same but turning the key on once to on, rather than three times.

That 10 times stuff is nothing elated to these trucks.

 

[Mopar1973Man]

APPS Sensor is dead period there is no amount of adjust that will fix it if it wander all over the map with voltage. There is no way to clean or or repair it. The APPS sensor has to operate within normal range of voltage anytime the voltage rise or falls out of range the ECM drop the APPS sensor signal and ignores it out right "Dead Pedal" then the ECM continues to look for a valid APPS signal again once found it uses it. This why a lot of times people release the throttle and the ECM picks back up again.

Once again voltage adjustment only sets IDLE and THROTTLING validation switches. That's it!

 

[Anabolic]

ok, i'll order the new one.. tried reset and adjust again, was good for 2.5 miles and died again.

 

[bigfish95971]

I agree it is probably bad. How may have you ever seen that were completely dead with no out put at all? But I wonder if the way screwed with it trying to adjust/reset it confused the ecm into thinking idle voltage was also maximum voltage. so it is not recognizing the accelerator voltage change. It can never hurt try resetting the APPS correctly before doing more expensive things.