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Old 12-28-2009, 09:04 PM
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Default How to build your own TPS setting tool







+5V to "Vc"
-5V to "E2" and to the (-) into your digital voltmeter
"Vta" is the output to the (+) on your voltmeter

Also, Remember this is not a TESTER....it is a tool for setting the TPS... you could have a "Bad spot" in the TPS and not have it show up on the meter..

To "TEST" the TPS, you need a good old fashioned analog volt/ohm meter, the kind with a needle and scale.

You hook the probes up to the Vc and Vta terminals and slowly squeeze the throttle lever... look for smooth movement of the needle on the meter without any jumping or dropping off the scale.

I had one TPS that "set well" but it had a dead-spot in it.

Also, The 5 volt regulators from Radioshack come as bad as well... Test for 4.99 to 5.01 volts, with a fresh 9 volt battery before you solder it together... I had 3 out of 5 test low for voltage from the ones I bought at radio shack.

Quote:
TPS TESTER

These are Radio Shack Parts numbers to assemble a homebuilt Polaris TPS tester.

2761770 - $1.49 +5VDC voltage regulator 1amp
2700324 - $1.99 9 volt battery connectors (they only come in a pkg. of 5)
2701545 - $2.99 Insulated Alligator Clips(come in a pkg. of 6 pairs)
2701802 - $2.29 Project Box
2300875 - $2.69 9 volt Battery

Total price for regulator, 1 battery connector, 1 pair alligator clips,
project box and battery was $7.36.


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Old 02-07-2012, 09:25 PM
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Default Tool

To make this tool easier to build yourself I suggest using a cell phone charger from any android phone cheap and easy to get , and is 5 volt dc, and you will never have to worry about battery low, it works great . Can post pics if anyone is interested.
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Old 02-08-2012, 04:52 AM
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that you can do...but hook the charger up to a oscilloscope first, if it isn't stabilized and filtered to give a flat dc then i think that battery will be more accurate(don't know how sensitive it is but phone chargers are switched so they wont give 5v, they give 5v +-something so your multimeter will measure a effective value and not a actual value)
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Old 02-08-2012, 11:23 AM
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There's a ±-tolerance on all instruments... some are just a lot more accurate/repeatable than others.

I use a lab power supply with a dedicated 5V output. On my 50k-count meter it's 5.0003V.

USB spec is 5.0±.25V. Measure it with a meter unloaded (off the TPS) and again with it on the TPS, make sure it's about 5 both places. If you've got a charger that's "close enough", by all means go for it! 5V is 5V regardless of where it comes from.

You could do a tolerance stackup analysis and know for certain the error in your measurement system. Realistically, the ECU's sensor source output and ADC are probably a lot less accurate than the source and DMM you're using. The 40mV TPS tolerance on my 900 is pretty huge; on a 12-bit A/D that's a 32-count error.

Bottom line is you don't need Josephson-junction precision/accuracy to set your TPS.
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Old 02-08-2012, 02:26 PM
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ok good to know, learned something new then
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Old 02-08-2012, 02:54 PM
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Just don't do what my neighbor did and remove the TPS to remove the carbs (throttle bodies). Makes it hard to start after you get them on wrong. Did the 9v with the regulator deal and got it set.
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