TPS Setting/Testing

[FireKracker50]

I have seen how to test your TPS voltage using the TPS test leads. Is there a way to test it without having to buy the leads? I have a Fluke meter with standard leads. Cant i just tap into a couple of the wires and get a reading?

[chad202]

Get two strands of copper for the inside of #12 (or whatever) wire you have laying around. Around 3" long. Unplug your three wire tpi and place the strands of copper in the female holes in the plug and bend them to the side, now plug the plug back together. Turn your meter to DC voltage, disconnect your tan temp wires and turn your key on. Read the voltage. Have someone press the hotfoot smoothly and make sure the volts climb smoothly with no sudden jumps.

[rchevelle71]

Which color wires should we be testing, cuz when I id it your way I was getting some funky readings, just bought the test harness, should be here today, why disconnect the tan temp wires, manual doesnt say to do this?

[FireKracker50]

everyone has told me to disconect them...
I will try this test today... thanks for the info

[gfinch]

In testing a TPS most of the time the glitch or drop out will occur at the point where the throttle is most of the time. On a car it is at or just above idle (tip in) or at the point of freeway cruise speed.
A Graphing multi meter will catch drop outs and glitches where it is difficult to see the extremely rapid changes you are looking for with a Digital Volt Ohm Meter. Refresh rate is TOO SLOW. You might catch it if you use the Min Max setting.
Having a secure trusted connection is very important, other wise you will question the results.

[pyro]

Testing and calibrating procedure is not the same for all motors. Check your OEM service manual. The manual can be trusted.

[rchevelle71]

Having a secure trusted connection is very important, other wise you will question the results.

I agree, and that is why I broke down and bought the harness.

[rchevelle71]

Testing and calibrating procedure is not the same for all motors. Check your OEM service manual. The manual can be trusted.


I agree, my manual states nothing about the temp sensor, and it is a Merc manual, not a knockoff. I dont see where it can hurt though, so I will try both ways, and see if it makes a difference.

[FireKracker50]

the wire trick worked... i'll have to try compaing results with temp connected and disconnected.

[fastskeeter]

what i did was cut the wire and soilder on a protected barrel connector to each wire and made some leads for my tester. i like to use a two decimal meter for readings when checking for flatspots. it seem more accurate.

my .02 cents

casey

[pyro]

If the meter has a "bargraph" readout below the digits, set the meter to a suitable fixed range (not auto-range) so it doesn't auto-switch display range while you're trying to read the TPS. The graphs seem to refresh faster than the numeric display, and gives a better visual of the voltage through its range.

[rchevelle71]

Diconnecting the temp sensor did nothing on my motor, same reading either way. That Merc test harness is nice, pricey but nice.