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Join Date: Oct 2011
Location: Pasadena, CA
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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.
-'97 Mini Monster
-Bean's: 160/100 (FF Injectors), 2/ 6-POS chips (TW & Beans tunes), Overboost controller, E-Fuel
-BANKs: downpipe, full exhaust, gauges, intercooler
-Irate: T-4 kit, IC pipes, 3" Irate Plenums, BASB Turbo
-Stage II trans.
-Mag-Hytec trans. and pumpkin covers
-6637, CCV, IDM, 6.0 Fan, 49-Federal PCM swap, MAP line Mod
-370 Amp alt., 40k trans cooler, ADRENALINE PUMP
-twin on-board air w/ 10 gal. tank
-'15 F350 6.7L DRW 4x4
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Last edited by BigFuel; 09-06-2013 at 09:32 AM.