TPS testing

[Dugan]

Am I doing this right?

http://www.youtube.com/watch?v=AeMTkZ0Dz6w&feature=plcp

Black wire on ground and red on signal.

Reads .79 initial. and seems to go open once a certain point is reached. I tested the two TPS I have and the new brand new ones sitting on autozones shelf. Did the same thing.

 

[lil_Blue_Ford]

You're supposed to use an analog meter for testing them. Digitals have too much delay, you use an analog, and slowly open the throttle up and watch the needle to see if it swings freely or if there are any dead spots.

 

[Dugan]

You're supposed to use an analog meter for testing them.

Just saw your edit


But the whole open circuit looking thing and the voltage reset is what bugs me

 

[lil_Blue_Ford]

Just saw your edit


But the whole open circuit looking thing and the voltage reset is what bugs me

I'm guessing it has something to do with using a digital meter. I've never tested one with a digital meter before, I just pull out one of my el-cheapo analog. Never seen that sort of fluctuation using one of those on even a defective TPS.

What is it doing that is making you suspect the TPS?

 

[Dugan]

http://www.therangerstation.com/forums/showthread.php?t=129143

Other then the three page list above of all I have replaced,

The truck will begin to bog and make noise out the intake. At low rpm its usually fine and does it around 2500-3k but sometimes you can barely even shift before it will do it.

The truck will hesitate and bog and the rpms at full throttle will bounce between 2500-4k back and forth on full throttle as the motor is making this bogging noise.

Noise: http://www.youtube.com/watch?v=UOR7U_FjWOw&feature=plcp

 

[pjtoledo]

Just saw your edit


But the whole open circuit looking thing and the voltage reset is what bugs me

the meter is not resetting

take a closer look at the decimal point


the display in your meter maxes out at 1.999, if you observe the decimal point it goes from 1.999 to 2.00

FYI TPS sensors are resistors, you are reading resistance in ohms

 

[a31ford]

Dugan, a TPS is nothing more that the volume knob on an older type home stereo (Non-remote control) the ones that you had to get up and crank the knob up and down.

The TPS is a rheostat or potenteometer, with the part in the recess being the knob (connected to the throttle plate) a digital VOM will be spastic, use an old style meter with a needle, and set it for ohms.

Greg

BTW, did you ever get a copy of "the GOD Book" from my website ? it has ALL this stuff about the EEC/IV computer, and sensors...... (search for the thread) or I can go get the link.

Greg

 

[Dugan]

I gotta grab a copy soon. Haha I'm an electrical engineer I know that stuff but this crap meter looked like it was going open then back to .2. Or is it .2k haha dodnt look

 

[Dugan]

Oh wow im dumb its 2.0 haha

 

[97RangerXLT]

Just make sure to include the coverletter on your TPS report.

You did get the memo, right?

AJ

 

[Dugan]

Just make sure to include the coverletter on your TPS report.

You did get the memo, right?

AJ

U got my staaplrr

 

[lil_Blue_Ford]

Just make sure to include the coverletter on your TPS report.

You did get the memo, right?

AJ

U got my staaplrr

To think that I almost watched that movie again last night....