Throttle Position Sensor Voltage

[Ol Blue 2018]

1987 V10 TBI 350

Using my trusty "paperclip", I see I have a code 22: Throttle Position Sensor (signal voltage low)

Using a multimeter I see that I have .54 volts at closed throttle and 3.4 volts at wide open throttle. My service manual says I should have about .5 volts at closed throttle and about 5 volts at wide open throttle.

I am thinking this means replace the TPS. Is this correct?
Thank you and let me know if this sounds right.

 

[Camar068]

not knowing what it looks like, is it possible to clean it?

 

[1987 GMC Jimmy]

Your low voltage is perfect. I can’t even get mine to read that low after boring the mounting holes in order to pivot the sensor. The high one is a problem. It should be 4.5-5V. Did you notice any dead spots? If your throttle linkage is moving like it’s supposed to all the way to WOT, I’m thinking replace it.

 

[yevgenievich]

Verify 5v exists on one of the wires. If reference is good, then sensor likely at fault

 

[Ol Blue 2018]

not knowing what it looks like, is it possible to clean it?

Yes, maybe but frankly if I take it off, it's getting replaced.

Your low voltage is perfect. I can’t even get mine to read that low after boring the mounting holes in order to pivot the sensor. The high one is a problem. It should be 4.5-5V. Did you notice any dead spots? If your throttle linkage is moving like it’s supposed to all the way to WOT, I’m thinking replace it.

I did not notice any dead spots at all. I assume that yes, my throttle linkage is functioning properly.

Verify 5v exists on one of the wires. If reference is good, then sensor likely at fault

OK great. I got 5 volts on one of the other wires constantly. Does it matter which one? There is a light color, a dark color and a blue one. The blue one is the one that changes with throttle position.

Thanks for the responses!