tps

February 07, 2006, 09:19:57 PM

how do you test the throttle position sensor? my repair manuals only tell how to replace it.
thanks in advance
jeremy

tps

Reply #1 – February 07, 2006, 10:12:03 PM

Hope this helps
From jcassity's thread General Car and detailed "HOW TO DIY"

tps test throttle position sensor
1 location-- vertical mounted on pass side of CFI with org/blk/grn wires.
Probe the green wire with positive lead of a meter and ground out
the black lead of your meter.

2 turn ign sw on ,, no start

3 the voltage reading on your meter should be around .5-.9 vdc.

4 operate the throttle linkage very very very slowly and note increase in voltage. Your increase should be smooth with no jumping and it should top out at around 4.6 vdc.

notes..
It is best to use an buttstuffog (needle type) meter when doing this step because it will detect flat or open spots on the variable resiseter (tps) better than the digital types.
you can bench test the tps buy hooking up to the green and black then black to org and measuring resistance and the two readings should match. The green wire is the center tap of the variable resistor. The resistance reading will be proportional to what you see in dc volts.

if you find your low end voltage is at or above one volt,, use a chainsaw file to file out the mounting holes so that you can mount and adjust the tps CCw to achieve the "less than a volt" goal.

when installing the tps,, lay it in place but slightly clockwise,, seat the tps then rotate it ccw to line up the mounting screws. There is a little pin up in the likage that will put your tps in a bind if you dont do this correctly. You cant just lay it on and bolt it down any old way.

tps

Reply #2 – February 07, 2006, 10:16:24 PM

thanks ill try that tomorrow because its dark and cold outside tonight.