Engineers and electrical gurus have a question regarding TPS calibration and ohmmeter

[Redlyne_mr2]

So I'm calibrating my TPS tonight. In the work manual it reads: Gradually turn the sensor clockwise until the ohmmeter deflects and secure it with the two set screws

What do they mean by deflect? Does it mean until I get resistance?

Thanks for the help

Ryan

[dj_honda]

They are talking about using an analog ohmmeter and yes, when there is resistance the needle will move or "deflect".

[gretz]

This site may help
http://www.tpub.com/neets/book3/7l.htm

[Redlyne_mr2]

Gotcha, so pretty straight forward.
1. Feeler gauge (.60mm) between the throttle stop screw and stop lever
2. Connect ohmmeter test probes on appropriate terminals on the tps
3. Turn the TPS clockwise until I see resistance on the ohmmeter.
4. Set the TPS to that position once resistance occurs

Sounds easy enough, thanks

[gretz]

ya - no prob

[dj_honda]

Yea but usually there is a specific resistance or a voltage that you look for. But I don't know the specific instructions for your car.

For example for a B series honda when the throttle is closed there is a specific voltage that a wire should read and same thing when it is fully open. Based on that you adjust the TPS until it is within spec.

[Redlyne_mr2]

Originally posted by dj_honda
Yea but usually there is a specific resistance or a voltage that you look for. But I don't know the specific instructions for your car.

For example for a B series honda when the throttle is closed there is a specific voltage that a wire should read and same thing when it is fully open. Based on that you adjust the TPS until it is within spec.

Ive got the factory manual infront of me here and it looks like specific voltage is not required. Basically as soon as you see any form of resistance you set the TPS where that resistance occurs.

It then asks you to do a final check to ensure the TPS is set properly at .5mm you should have continuity, at .7mm you should have no continuity.

[dj_honda]

sounds good

[Ashers]

Sounds like instead of adjusting for a specific resistance, you're actually adjusting some kind of idle microswitch. So just adjust until the switch trips?

[gretz]

yes, until the ohmeter 'deflects'

[Honda_002]

and unless you have an expensive multimeter with a true rms signal (reads exact numbers at that exact time) your adjustment might be out because regular multimeters will take range from high and low resistance in this case, and show you the average, so when you do your adjustment turn your screw as slow as possible.

unless your multimeter has a quick refresh rate

hope that helps

[Redlyne_mr2]

Originally posted by Honda_002
and unless you have an expensive multimeter with a true rms signal (reads exact numbers at that exact time) your adjustment might be out because regular multimeters will take range from high and low resistance in this case, and show you the average, so when you do your adjustment turn your screw as slow as possible.

unless your multimeter has a quick refresh rate

hope that helps

10-4

thanks guys

[HiSpec]

Originally posted by Redlyne_mr2

10-4

thanks guys

you work at a lexus dealership right?
the shop might have oscilliscope that also measures resistance... might want to check with them... they are pretty accurate

[Phuqu]

Fill this out when you are done.

[Redlyne_mr2]

^^^^ hahaha ass... got it all done thanks guys