Well according to my book the 4.9 isn't adjustable, and I don't feel like looking at mine right now. I guess to adjust it on a V8 you would have to leave the throttle body off with the TPS plugged in so you could adjust it since it's not accessible.

 

See, that is why I hate the manuals. They assume that the truck is appart and everything is easily accessible. I will check mine out and see where it stands. I can't find what the votage range is supposed to be, the manual says according to the chart, where is it?

 

How much for a new one??

 

About 1 volt at idle and 4 to 5 volts at wide open.

 

I paid 45 for a new one at autozone

 

Ok again, I am getting conflicting information. Do the truck need to be on or off to test? The manual states off and test the terminals and see if the reading is the same in all points. I have three terminals, so they all should be roughly the same, huh?!! Now wide open would mean the truck is ON, right? Now the terminals on the TP sensor won't be connected to the electrical system if it is disconnected, so the voltage will be internal to the TPS device, right? Therefore over time it looses voltage right? Now just to clarify, this is what I did,
I unplugged the TPS sensor and put a voltmeter on it, I didn't get anything. Maybe I don't know how to read one, but I tried every setting and the needle or the digital numbers (I used both) didn't move. Now I really don't understand how a reading would be gotten if disconnected, but obviously I don't know about this stuff. Next I reconnected the Sensor and turned the engine on. I then disconnected the sensor and obviously got the "check engine light". There was a slight reduction in the spinning of some of the pulleys and in the idle speed, but nothing too noticable. I reved the engine and it still gave the delay reaction as I pushed on the throttle. The attached pictures shows what I tested, was this the right connection, I tested the one on the right under the TB, and even the one on the left which is the engine connection. maybe I am doing it wrong. Let me know.

 

On or off, plugged in or not those are two different tests. With the TPS unplugged you can only measure resistance and how smoothly the resistance changes. With it plugged in and turned on you test actual voltage in and the actual signal it gives the computer.

 

You'll want the key on, engine off. Leave the sensor connected, and back probe the wires where they run into the sensor connector.

 

I pushed my probes into the connector (backside) until I touched metal, I am not getting anything. Once again, I am no electrician, but would expect something to register. I am just going to have to buy one, or get somebody who knows what the heck they are doing.

 

You won't get any reading with the truck off or the sensor unplugged. With the sensor unplugged you can measure the resistance. You have to hook the voltmeter to the ground wire and signal wire and set the voltmeter to Ohms. The voltmeter will need to be self powered for this, and the batteries die on them because nobody ever changes them. With the key on and the sensor plugged in you can measure supply voltage by probing the power supply wire and grounding the negative side of the voltmeter (about 5 volts). You can check the signal by probing the ground and signal wire with the key on, .5-1 volt at idle and 4-5 at full throttle. Set the voltmeter to the lowest DC voltage setting for the key on tests.