Throttle position sensor issues
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5th Wheeling
Joined: Apr 2025
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Throttle position sensor issues
Took my 94 f250 7.3 idi turbo to get the IP replaced, I got it back and it was shifting extremely hard into 2nd gear at low rpm but would shift fine over 1800 or so rpm’s. Took it back to the shop and it’s been there the last 3 weeks with no updates except today when I told him I’d be coming to get it and it just so happens that it’s “all taken apart”. Told him to put it back together and I got it back today. When I put my multimeter to the tps/fipl whatever you’d like to call it, it’s reading .44 volts no matter how far I twist it clockwise and counter clockwise. Would this be a sensor issue or wiring harness issue? It’s showing .01 ohms to the ground and 5 volts to the other wire and from what I’ve read here and other forums that’s what they should be reading. I called today and ordered a new tps sensor but is there anything else I should look into while I have the tools out?
Fleet Owner
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From: Mi'kma'ki
First, try replacing the battery in your meter. Second, be sure you're placing the black, negative lead of your meter, directly on the negative terminal of a battery.
A/T - E40D FIPL (TPS) Sensor Trouble Shooting & Adjustment (Diesel Applications Only)
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5th Wheeling
Joined: Apr 2025
Posts: 26
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First, try replacing the battery in your meter. Second, be sure you're placing the black, negative lead of your meter, directly on the negative terminal of a battery.
A/T - E40D FIPL (TPS) Sensor Trouble Shooting & Adjustment (Diesel Applications Only)
Fleet Owner
Joined: Jul 2006
Posts: 20,375
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From: Mi'kma'ki
Yeah, never assume the battery in your meter is good, when it reads off the wall. It's cheap or free (if you have rechargeables) to swap it/them out. If it's not the battery in your meter giving false readings, then it should be a bad sensor..........but it's odd it's way off like that. Generally they read ok voltage but they will get a dead spot, that's why I'd suspect the battery in the meter before replacing the TPS.
Tuned
Joined: Sep 2024
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From: Ougadougou
FWIW you don't have to hold both probes--just insert the positive probe into the back of the TPS connector and then you're free to use one hand to move the throttle while holding the other probe to battery ground.
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5th Wheeling
Joined: Apr 2025
Posts: 26
Likes: 4
Yeah, never assume the battery in your meter is good, when it reads off the wall. It's cheap or free (if you have rechargeables) to swap it/them out. If it's not the battery in your meter giving false readings, then it should be a bad sensor..........but it's odd it's way off like that. Generally they read ok voltage but they will get a dead spot, that's why I'd suspect the battery in the meter before replacing the TPS.
Tuned
Joined: Sep 2024
Posts: 488
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From: Ougadougou
Try 1.2v at idle. There was a notice from FoMoCo recommending 1.2v. The firmer shifts reduce clutch slippage is what I've read. I also like being able to thoroughly wind out a gear before the trans shifts and the higher idle voltage seems to help.
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5th Wheeling
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I originally had it set to 1.2v but it was winding out to about 2200rpm before it shifted and I wasn’t super comfortable with that…I’ll look into though. The last thing I need is the tranny to start having issues. I just figured as long as it’s not giving me whiplash when it shifts than it’s fine as long as it’s within that .95-1.2v range. I did notice also it kept going in and out of OD when I had it set to 1.2v originally. Than again it is a bit hilly around these parts in north east PA
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Tuned
Joined: Sep 2024
Posts: 488
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From: Ougadougou
I originally had it set to 1.2v but it was winding out to about 2200rpm before it shifted and I wasn’t super comfortable with that…I’ll look into though. The last thing I need is the tranny to start having issues. I just figured as long as it’s not giving me whiplash when it shifts than it’s fine as long as it’s within that .95-1.2v range. I did notice also it kept going in and out of OD when I had it set to 1.2v originally. Than again it is a bit hilly around these parts in north east PA
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