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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Odd shifting, uncoordinated trans

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Old Sep 6, 2024 | 11:47 AM
  #16  
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Originally Posted by 96 4x4
Is there a wiring diagram for either VSS? In the event I need to do some re-wiring.
Edit
Whoops. I posted the fuel system by mistake.
 
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Old Sep 6, 2024 | 11:51 AM
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VSS Diagram for a 1996 F-Series truck:
 
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Old Sep 6, 2024 | 04:17 PM
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Originally Posted by rla2005
VSS Diagram for a 1996 F-Series truck:
thank you very much
 
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Old Sep 9, 2024 | 02:51 PM
  #19  
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Originally Posted by rla2005
Highly suggest a good ELM327 adapter and FORscan free version.
got my reader, about to hook it up. The check engine light finally came on lol.

when you setup FORscan, did it let you put model truck in? For me it only came up as a 1999 Ford Escape or something.
 
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Old Sep 9, 2024 | 03:09 PM
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I have used FORScan on several vehicles. That information comes fro the PCM programming I believe. I do not recall having to select anything.
 
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Old Sep 9, 2024 | 03:25 PM
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Originally Posted by rla2005
I have used FORScan on several vehicles. That information comes fro the PCM programming I believe. I do not recall having to select anything.
I got it to work. It found my truck. 1996 F150 5.0L etc,

I have a P0122, P1000 (it says it couldn’t test it), and a P1125. Says it’s the Throttle position sensor (P0122), and the PowerTrain control module (P1125).
 
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Old Sep 9, 2024 | 05:10 PM
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Both P0122 and 1125 are related to a faulty TPS. Test it with a meter or o'scope if you have one. P1000 just means all the Monitors are not set to Ready.
 
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Old Sep 9, 2024 | 11:00 PM
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Originally Posted by rla2005
Both P0122 and 1125 are related to a faulty TPS. Test it with a meter or o'scope if you have one. P1000 just means all the Monitors are not set to Ready.
could a TPS really cause odd trans shifting though? I feel like that’s too easy haha.
 
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Old Sep 10, 2024 | 05:17 AM
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Yes it can.
 
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Old Sep 15, 2024 | 02:20 PM
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Originally Posted by rla2005
Yes it can.
replaced the TPS today, it’s shifting better, but it’s still throwing PCM codes. I may have to check the wires to the pcm from the TPS, is that a super sucky wire trace?

I got the duralast TPS from autozone.

here’s the codes btw:

 
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Old Sep 15, 2024 | 03:45 PM
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That Duralast TPS will cause you more headaches sooner than later. Use a meter to verify the output voltage key on, engine off. Should be between 0.6 to 1.0 VDC. Perhaps a bit higher for your model year.

Pretty straight forward to trace the wiring in my opinion. Not likely to be your issue given the code.
 
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Old Sep 15, 2024 | 03:47 PM
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Tracing the wiring by looking at it is a waste of time. Check the circuit from the PCM to the sensor for continuity, short to power, and short to ground.
 
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Old Sep 15, 2024 | 04:16 PM
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Originally Posted by rla2005
That Duralast TPS will cause you more headaches sooner than later. Use a meter to verify the output voltage key on, engine off. Should be between 0.6 to 1.0 VDC. Perhaps a bit higher for your model year.
why are the duralasts bad? Pretty much all the others I could find were in the ball park of $20 and didn’t have good ratings.

also, I’m not savvy with the codes, but it said it was all pcm codes. It’s the original pcm, so it could be on its way out.
is there a certain TPS you recommend?
 
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Old Sep 15, 2024 | 05:25 PM
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Originally Posted by 96 4x4
why are the duralasts bad? Pretty much all the others I could find were in the ball park of $20 and didn’t have good ratings.

also, I’m not savvy with the codes, but it said it was all pcm codes. It’s the original pcm, so it could be on its way out.
is there a certain TPS you recommend?
Duralast is Autozones house brand. They are notoriously bad quality, whether it is TPS, fuel pumps, alternators, or rubber seals. I learned a decade ago to avoid duralast after their Chinese rubber timing chain cover seal cracked and leaked after 2 years and 100 miles. Their alternators cause pulsing headlights. Their fuel pumps are dead out of the box, their water pumps leak.
Go to rock auto and buy the most expensive TPS you can find. Brand names like Delphi, Delco, Motorcraft, or Carter are the way to go.
 
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Old Sep 15, 2024 | 07:20 PM
  #30  
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Originally Posted by Prototypemech
Go to rock auto and buy the most expensive TPS you can find. Brand names like Delphi, Delco, Motorcraft, or Carter are the way to go.
got an NTK on rock auto on the way, it’s not only cheaper than the Duralast, but was the highest rated and most expensive on rock auto.

will update once I get it and install it.
 
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