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Old 09-06-2013, 08:16 AM
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tps question

what is the difference between a tps sensor and a app sensor. my truck keeps throwing a p0221 code. will this also cause the trans to shift weird?
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Old 09-06-2013, 08:26 AM
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The TPS/PPS/APS (Throttle Position Switch [not found in diesels, we do not have "throttles"]/ Pedal Position Switch/ Accelerator Position Switch) is a variable resistor (think dimmer switch) that tells the PCM how hard you want to accelerate (PCM calculates against the VSS and tranny currently selected gear). The AP switch works with the IVS or Idle Validation Switch. This is a separate switch on the pedal assembly that tells the PCM to override the TPS and enter "Idle Logic". P0221 is usually a sign that the IVS is starting to malfunction and is either not clicking open quick enough for the TPS as you come off idle or that the IVS is closing while you are driving off idle. If this sets a hard fault to the PCM you will be stuck in idle logic until you replace the IVS.

Test the IVS by hooking a meter to it in OHMs setting (truck off) and push the go pedal in and out. A clean signal from the switch will show OFL->.01->OFL->.01 ONLY! Any wavering/jumping in the signal generally means the switch is faulty.

Last edited by BigFuel; 09-06-2013 at 09:32 AM.
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Old 09-06-2013, 09:21 AM
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if that is the case then how do I go about fixing it?
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Old 09-06-2013, 09:27 AM
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Welp, the **** answer is that you have to go back to Ford and buy a whole new pedal as the switches on the pedal are Ford labeled "non-adjustable/non-repairable". Dorman sells the resistor and switch separately but the the quality is hit or miss. That just leaves going to a pick-and-pull and harvesting one out of a dead diesel.
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Old 09-06-2013, 09:32 AM
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i did the ohms test and when the pedal was pushed in it was readin 0.00 and when left out it was every where
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Old 09-06-2013, 09:34 AM
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k. Your meter reads much lower than mine to show .00 to my .01. IVS is done. Get a new one soon.
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Old 09-06-2013, 11:26 AM
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For us, the TPS/APP/PPS sensors are the same thing. You can always try spraying the IVS with some Electrical Contact Cleaner. I would do it with the connector unplugged and cyle it a bunch. There was a post on one of the forums on the IVS being (somewhat) available. I'll see if I can find it. Cheers!

Thanks to "Desert Rancher" for the following info:
Quote:
This is the Manufacturer and P/N for the Ford IVS. It is the actual part made for Ford.

Look here: http://www.onlinecomponents.com/cutl...tml?p=11071279

Cutler Hammer/Eaton SS22BW32-330Y

Last edited by Patrick Feeley; 09-06-2013 at 11:33 AM. Reason: Added info
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Old 09-06-2013, 11:30 AM
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The stock Eaton number is SS22BW32-330Y but hard pressed to have someone with it in stock.
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Old 09-06-2013, 05:03 PM
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My 95 has the sensor and switch that can be replaced, also check NAPA for the complete petal assembly, Dorman makes them, I sold a couple for the 2000's super duty, cant remember what years though. Or try ebay.
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Old 09-07-2013, 01:09 PM
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Thanks for the help guys. I found a pedal out of a wrecked psd. so hopefully when it shows up and i put it in it fixes the problem. Been having problems with it since the garage changed the app sensor a year ago.
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