P0221 TPS sensor b issue please help - Ford Powerstroke Diesel Forum
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Old 06-12-2014, 09:01 AM
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P0221 TPS sensor b issue please help

So I am pretty frustrated with the truck. Its a 2001 F250 2wd 7.3 with 218k miles. I have come to know that the 7.3 is a beast of an engine, but all the sensors that are needed to make the truck run are much more fragile and problematic. Anyways, here is what I have got so far.
  • few weeks back the throttle would go dead randomly. I let off the throttle, pump it a few times and it would come back.
  • last Saturday it went dead in a bad way. Took a lot of pumping to come back up and I got a SES light but it did come back
  • Pulled P0221 code, got on this awesome website and found the possible solutions.
  • Pulled throttle pedal assembly, cleaned it real well and reinstalled. Problem still happening, albeit not as bad, but still there.
  • Ford dealer couldn't find a part number for the 2 sensor pedal that I have so had to order aftermarket throttle pedal.
  • Installed new throttle pedal, cleared code and went for test drive
  • very shortly after leaving the driveway the SES light came back on with the same code.
  • Have ordered another throttle assembly to try. Will be here Friday

I have also checked the fuses that I know to check, namely fuse #19 on my truck. I have no fuse #45. Coincidentally, it sure would be nice if Ford would have labeled what the fuses are for. All I have is numbers.

Is there anything else that I can check here? Can a chafed overdrive wire cause the issue but not blow the fuse?

I really hope you guys can help. I want to avoid taking it to the shop to diagnose this. Not to mention that I am so frustrated with this to the point that I am looking online to see how much I can get for the truck.

Thanks,
Chad
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Old 06-13-2014, 10:52 AM
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Update:

Been driving it around for a couple days now waiting on the new part to come in and haven't had any throttle issues, but the code is still there. Really hoping a second pedal assembly will fix the issue.

Thanks,
Chad
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Old 06-17-2014, 11:02 AM
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Update for the record.

Another pedal seems to have solved the problem. If this one goes out I am going to try and find a ford pedal next time as these aftermarket ones seem to be hit or miss. I also looked at the chafed wire issue while I was working on the truck. Its no wonder there is an issue with how Ford Routed the overdrive wire. I added some more electrical tape and rerouted it a little bit to hopefully prevent that issue from ever happening.
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Old 06-17-2014, 12:32 PM
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Quote:
Originally Posted by dante81_98 View Post
Can a chafed overdrive wire cause the issue but not blow the fuse?

Yes, I think so...

When the tiniest bit of wire is exposed I think it Can drawn-down the voltage enough to cause confusion from the TPS without drawing enough to blow the fuse.

But, ultimately, why not just check it anyway? It's Such a common problem that you should want to eliminate it from happening in the future so, I'd have a look!
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Old 06-17-2014, 01:16 PM
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Quote:
Originally Posted by NoRalPh View Post
Yes, I think so...

When the tiniest bit of wire is exposed I think it Can drawn-down the voltage enough to cause confusion from the TPS without drawing enough to blow the fuse.

But, ultimately, why not just check it anyway? It's Such a common problem that you should want to eliminate it from happening in the future so, I'd have a look!
Yeah, I did, it was clean and clear. That said I figured why not do some preventative actions while I was in there and fixed the routing and added some extra electrical tape to protect it. Should be good until the crusher gets the truck some day in the very distant future.
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