Help with Throttle Position Sensor (TPS) Reading
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Help with Throttle Position Sensor (TPS) Reading
According to what I have found online, a multimeter test of the throttle position sensor on my 1994 F250 should read about 1v DC at closed throttle and slowly change when the throttle is opened. After doing a test of the TPS sensor I got 0.034v DC when closed and 0.025v DC when all the way open. I checked the voltage from the PCM which checked out at 5.050v DC. I checked the ground which checked out at 11.30v DC. I went to Autozone to get a replacement TPS and I am getting the same exact reading on the new unit. What am I missing? Both sensors can't be bad, correct?
Below is the url to the website that I used to test the TPS.
https://easyautodiagnostics.com/ford...sensor-tests-1
Below is the url to the website that I used to test the TPS.
https://easyautodiagnostics.com/ford...sensor-tests-1
Tuned
Joined: Apr 2007
Posts: 372
Likes: 14
From: Central Minnesota
This is not a GM unit were the TPS is like a big resistor varying voltage. This uses an FM wave and changes the frequency of the wave, the basis of the speed density system of Fords. It's difficult to measure w/o an ECCIV breakout box. I'll get back to you in a bit, that stuff is box packed out in my shop and I have to dig it out. I'm sure some one else will pop in the the data points and techniques of checking. Larry.
Lead Driver
Joined: Jun 2021
Posts: 5,219
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This is not a GM unit were the TPS is like a big resistor varying voltage. This uses an FM wave and changes the frequency of the wave, the basis of the speed density system of Fords. It's difficult to measure w/o an ECCIV breakout box. I'll get back to you in a bit, that stuff is box packed out in my shop and I have to dig it out. I'm sure some one else will pop in the the data points and techniques of checking. Larry.
New User
Joined: Jan 2022
Posts: 16
Likes: 5
Alright so,
Motorcraft TPS Wire Colors
VREF - Orange
TP SIG - Green
SIG RTN - Black
Measure between Green/Black and make sure that the TPS is not installed backwards on TB. Your reading will be decreasing voltage, if the throttle plate isn't moving the TPS in the right direction.
Motorcraft TPS Wire Colors
VREF - Orange
TP SIG - Green
SIG RTN - Black
Measure between Green/Black and make sure that the TPS is not installed backwards on TB. Your reading will be decreasing voltage, if the throttle plate isn't moving the TPS in the right direction.
Lead Driver
Joined: Jun 2021
Posts: 5,219
Likes: 804
Alright so,
Motorcraft TPS Wire Colors
VREF - Orange
TP SIG - Green
SIG RTN - Black
Measure between Green/Black and make sure that the TPS is not installed backwards on TB. Your reading will be decreasing voltage, if the throttle plate isn't moving the TPS in the right direction.
Motorcraft TPS Wire Colors
VREF - Orange
TP SIG - Green
SIG RTN - Black
Measure between Green/Black and make sure that the TPS is not installed backwards on TB. Your reading will be decreasing voltage, if the throttle plate isn't moving the TPS in the right direction.
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New User
Joined: Sep 2020
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Oh, so if the website is wrong that makes more sense.
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New User
Joined: Sep 2020
Posts: 18
Likes: 0
Alright so,
Motorcraft TPS Wire Colors
VREF - Orange
TP SIG - Green
SIG RTN - Black
Measure between Green/Black and make sure that the TPS is not installed backwards on TB. Your reading will be decreasing voltage, if the throttle plate isn't moving the TPS in the right direction.
Motorcraft TPS Wire Colors
VREF - Orange
TP SIG - Green
SIG RTN - Black
Measure between Green/Black and make sure that the TPS is not installed backwards on TB. Your reading will be decreasing voltage, if the throttle plate isn't moving the TPS in the right direction.
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Fleet Owner
Joined: Oct 2005
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From: Kentucky
Yes it is a big resistor, potentiometer to be exact.
This uses an FM wave and changes the frequency of the wave, the basis of the speed density system of Fords. It's difficult to measure w/o an ECCIV breakout box. I'll get back to you in a bit, that stuff is box packed out in my shop and I have to dig it out. I'm sure some one else will pop in the the data points and techniques of checking. Larry.
New User
Joined: Jan 2022
Posts: 16
Likes: 5
I actually went through exact same "problem" as the OP. Even went to the parts store like WTF u gave me junk.. Turns out I had it on backwards. I figured it out, once I started using the screwdriver to move it, away from the Throttle Body...
Lead Driver
Joined: Jan 2019
Posts: 5,070
Likes: 863
From: N.W. Alabama
And this is a very good write-up-->Throttle Position Sensor Testing, Replacement and Adjustment - Ford Bronco Forum
it tells shows resistance values, and what voltage closed is, and open is.
it tells shows resistance values, and what voltage closed is, and open is.
Hotshot
Joined: Jun 2015
Posts: 12,791
Likes: 2,426
I am not entirely sure what you mean by that. I assume you are saying that you had the tabs on the sensor on the wrong side of the tabs on the throttle body so that moving the throttle didn’t move the sensor.
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