THROTTLE POSITION SENSOR OUTPUT VOLTAGE

  • Tiny
  • bmxwayne
  • 1993 Pontiac Sunbird
  • 4 CYL
  • FWD
  • manual
  • 248,000 miles

I checked my tps as per instructions in my chilton manual and at idle position it reads 5 volts and decreases to.47 volts as I open the throttle to full my chilton manual says it should be just the opposite so is the manual wrong or is the tps bad

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Saturday, November 26th, 2011 AT 8:51 PM

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  • Tiny
  • rasmataz
  • Member

THROTTLE POSITION (TP) SENSOR
Install jumper wires to enable connection of a DVOM in parallel between TP sensor harness connectors. Connect DVOM positive lead to Dark Blue TP sensor signal wire terminal. Connect negative lead to Black, Black/Orange or Purple sensor ground wire terminal. See Fig. 3. Turn ignition on, with engine off. Signal voltage should gradually change from less than one volt at closed throttle to about 5.0 volts at wide open throttle position. If reading is not as specified, adjust or replace TP sensor. See ADJUSTMENTS article in this section.

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Saturday, November 26th, 2011 AT 8:58 PM
  • Tiny
  • bmxwayne
  • Member

Ok so the tp sensor is bad then that is what I thought but just wanted to double check info

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Saturday, November 26th, 2011 AT 9:00 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,291 posts

I would guess you may be doing something wrong. Even a bad sensor won't act that way.

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Saturday, November 26th, 2011 AT 9:44 PM
  • Tiny
  • bmxwayne
  • Member

I checked exactly how the chilton manual said to

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Saturday, November 26th, 2011 AT 10:52 PM
  • Tiny
  • Wrenchtech
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  • 20,291 posts

It could be installed incorrectly.

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Saturday, November 26th, 2011 AT 10:58 PM
  • Tiny
  • bmxwayne
  • Member

How could it be installed incorrectly

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Sunday, November 27th, 2011 AT 3:50 AM
  • Tiny
  • bmxwayne
  • Member

Ok I installed a new sensor correctly and still get the same reading of 5 volts at idle closed and it decreases as I open the throttle there is no short between wires what the hell else could cause this sorry about the mildly gruff language but I am frustrated to no end with this issue

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Wednesday, November 30th, 2011 AT 12:07 AM
  • Tiny
  • Wrenchtech
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  • 20,291 posts

What color probe are you putting on what color wire?

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Wednesday, November 30th, 2011 AT 12:15 AM
  • Tiny
  • rasmataz
  • Member

Try reversing the DVOM leads and read again

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Wednesday, November 30th, 2011 AT 12:21 AM
  • Tiny
  • bmxwayne
  • Member

Red test lead to white black test lead to blue or as described by my chilton manual red to bottom and black to middle

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Wednesday, November 30th, 2011 AT 12:24 AM

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