Im getting a reading of over 7 volts at the pin on the firewall.I reset the sensor it was good for 2 minutes then stiff pedal ,dash light came on and it died again.Only codes up are for tps.Adjusting it under the cover does nothing to change voltage at all either.Is the sensor just beyond fixing?

 

If you are referring to the 01 the supply voltage is only supposed to be 5v.supplied by the ecm.

Bob

 

its suposed to be .5 I read

 

Just adjusted mine this morning and it was reading 1.05V and my sticker said .518 so I set it at .52. Now I'm doing the apps reset to see if any changes will be noticed...I'm hoping my mpg goes up but with my luck, well you know how it goes. Anyway, not meaning to hijack this thread, but what should I expect from this adjustment?

 

So I just threw a P0121 code. I'm assuming now my APPS is going out. Or is there some adjustment for this? I did the APPS reset and I still have the code (waiting for a buddy to come by with a scan tool to clear the codes). I also disconnected it and cleaned the contacts.

But should I just replace the APPS? Or is there something else I can do?

 

You can try doing this, it's in the tech facts and it's what I did this morning.

Many have found that correcting the output voltage from the APPS sent to the PCM has increased the throttle response, and boost. This calibration also adjusts the APPS for wear.

Instructions:

Tools: Digital Volt Meter, T-20 Torx bit, #1 phillips, 10mm socket

With the key on, engine off you need to probe the APPS wire to see where the voltage is currently set at.
The best location to probe the wire is on the PCM (Power Control Module) which is located on the passenger firewall behind the air intake.
You want the C1 connector, this is the connector closest to the engine
You want the orange wire with a dark blue tracer which is pin #23 (Please use a suitable backprobing adapter for your meter lead, do not pierce the insulation as this can lead to water intrustion/corrosion.)
Voltage should be somewhere around 0.5 volts,
At this point the voltage reading does not matter, it just has to be accurately written down for later reference

TURN THE IGNITION OFF ON THE TRUCK

Remove the black plastic cover off of your APPS. There are two plastic screws. One on the top and one on the front facing the radiator. It takes a little prying to pull it off.

Undo the 6-10mm bolts that hold the bracketry in place but DO NOT REMOVE THE CABLES!!

You will notice the APPS is on the back of the bracketry that you just removed, it is held in place by 2-T20 torx bit screws. These screws have a little bit of locktite on them so make sure you have a good socket and gently give a little tap with a hammer before attempting to loosen. Be very careful because these screws strip VERY easily and you only get one shot at them (VERY VERY VERY IMPORTANT; They are VERY tight).

On the APPS you will find a white tag that gives you the information on what the APPS voltage should be.
After loosening the screws (do not remove) you can rotate the APPS clockwise or counter clockwise to get the adjustment (towards the front of the truck increases voltage and towards the rear of the truck decreases voltage)
The reading you took at the beginning of the process on pin #23 should match the white tag on your APPS. If it doesn't the adjust accordingly.