In this tutorial I'll show you how to test the throttle position sensor (TPS) on your 4.9L L6 equipped Ford with a simple multimeter.
You'll be surprised just how easy it is to find out if the throttle position sensor (TPS) is bad or not.
And the best part is that you don't have to remove it to test it... since the test I'm gonna' show you is done with the throttle position sensor (TPS) in place on the throttle body.
Here are the contents of this tutorial at a glance:
You can find this tutorial in Spanish here: Cómo Probar el Sensor TPS (1988-1995 Ford 4.9L) (at: autotecnico-online.com).
The throttle position sensor (TPS) is one of those sensors that the fuel injection injection can't live without. When this TP sensor fails... the fuel injection computer won't be able to effectively control the amount of fuel injection or timing advance and you're gonna' feel it as you drive your vehicle down the road.
Here a other symptoms of a bad throttle position sensor your Ford vehicle may experience:
As you're already aware, the throttle position sensor (TPS) on your 4.9L equipped Ford has 3 wires coming out of its connector.
Each wire starts and ends at the fuel injection computer (known in today's tech lingo as the Powertrain Control Module = PCM).
Each one carries a specific type of signal and in this section I'll briefly go over each one.
NOTE: I didn't include the color of the wires because they'll be different for each Ford covered by this tutorial. But don't worry... the circuits are the same regardless of the color of the wires or your specific model (as long as they're covered by this tutorial -see the ‘Applies To:’ box on the right).
TPS circuit descriptions:
Here's a brief description of the test I'll be showing you in this tutorial.
All of them are very simple and easy but you do need to keep in mind the following safety precautions:
The tests in this tutorial are:
“For instance, on the planet Earth, man had always assumed that he was more
intelligent than dolphins because he had achieved so much —the wheel,
New York, wars and so on —whilst all the dolphins had ever done was
muck about in the water having a good time. But conversely,
the dolphins had always believed that they were far more
intelligent than man —for precisely the same reasons!”
The Hitchhiker's Guide to the Galaxy