Mechanics

THROTTLE POSITION SENSOR OUTPUT VOLTAGE

1993 Pontiac Sunbird • 4 cylinder 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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Bmxwayne
November 26, 2011.




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.

Rasmataz
Nov 26, 2011.
Ok so the tp sensor is bad then that is what I thought but just wanted to double check info

Tiny
Bmxwayne
Nov 26, 2011.
I would guess you may be doing something wrong. Even a bad sensor won't act that way.

Wrenchtech
Nov 26, 2011.
I checked exactly how the chilton manual said to

Tiny
Bmxwayne
Nov 26, 2011.
It could be installed incorrectly.

Wrenchtech
Nov 26, 2011.
How could it be installed incorrectly

Tiny
Bmxwayne
Nov 27, 2011.
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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Tiny
Bmxwayne
Nov 30, 2011.
What color probe are you putting on what color wire?

Wrenchtech
Nov 30, 2011.
Try reversing the DVOM leads and read again

Rasmataz
Nov 30, 2011.
Red test lead to white black test lead to blue or as described by my chilton manual red to bottom and black to middle

Tiny
Bmxwayne
Nov 30, 2011.

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