LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

TPS Sensor

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Old Mar 10, 2011 | 08:24 AM
  #1  
rocknroler69's Avatar
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TPS Sensor

I just put on a 52 mm tb and now am going to check my tps sensor with a dmm. What should I have for a reading, I can't find a spec anywhere
Old Mar 10, 2011 | 11:18 AM
  #2  
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Re: TPS Sensor

i belive its .68 volts
Old Mar 10, 2011 | 04:50 PM
  #3  
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Re: TPS Sensor

Between .23v and .9v at idle (closed). When you open the throttle the voltage should increase smoothly and peak at WOT (with the PEDAL, not your hand) about 4v higher than your idle voltage. For example, if your idle voltage is .6v, then your WOT voltage should be approximately ~4.6v. If the voltage goes past ~5v you'll get an SES light for TPS voltage HIGH.
Old Mar 10, 2011 | 09:06 PM
  #4  
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Re: TPS Sensor

Is there any type of adjustment I could do if its not withing spec?
Old Mar 10, 2011 | 10:00 PM
  #5  
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Re: TPS Sensor

With-in*
Old Mar 10, 2011 | 10:39 PM
  #6  
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Re: TPS Sensor

Slot the mounting holes and rotate it until you get the reading you want.
Old Mar 12, 2011 | 06:37 AM
  #7  
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Re: TPS Sensor

Before you check the TPS voltage:

-verify the idle speed is within spec. The throttle stop screw may not be adjusted correctly, and that would affect the TPS reading.

-verify the IAC counts are between 20-40 counts. That verifies the throttle position. (you need a scanner or scan software to read this value from the PCM).

-now check the TPS voltage.
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