Calibrating the Voltage on the TPS

[beeza]

Ok,so I done this,here's how:

- Get several feet of wire. At least 6ft to make life easy. Cut them into 6 1' pieces and strip the ends. Now twist 2 pieces of wire together. So now you have 3 2' wires with the ends stripped and a stripped spot in the middle.
- There are 3 wires/pins for the tps sensor. 2 outside wires are ground and 5v source. Middle wire is the return voltage on the tps.
- Remove the throttle body, and connect your new spliced wires to the pins on the tps sensor on the throttle body and the pins on the wiring harness.
- Now connect your multimeter to the 2 outside wires (easiest to do this at the stripped points in the middle of the wires). This will also show you which wire is ground and wich is 5v.
- Turn the ignition to on (but do not start the car).
- Verify that you have 5v going to the tps.
- Now connect the multimeter to ground and the middle wire to measure tps voltage.
- TPS sensor is held in place by 2 screws. Open the throttle rotor to WOT and keep rotating the sensor until you get the output shown on the multimeter to 4.5v.
- Tighten tps sensor down & adjust idle setting screw shown in the pic below. Adjust this until the idle reading on the tps is about 0.48-0.49v.
- Now double check that WOT & idle tps readings are correct and put it all back together.

http://www.superhonda.com/forum/f49/tps-voltage-239633/

http://hondaswap.com/~pills/obd1guide.html

I got the 5V reading.
I couldn't get a 4.5V reading though.When I turned the TPS sensor as far as it will go it only read 3.25V.

The car goes much better now! :) but the idle is high at 1500rpm when in park (auto) also the engine check light is on (I reset the ECU but still on).I will need to do a code check.

I left the idle screw screwed right in how it was.If I turned it out it idle's far too high.
Why can't I get a higher reading,to 4.5V on the sensor at WOT?

I just thought,for WOT I got a mate to hold the throttle open in the engine bay instead of putting a foot on the pedal.The throttle was open more than if you had put your foot on the pedal,maybe that affected the reading?

[dsp26]

+rep for j00.. shoulda posted in DIY.

lol at the wire thing.. i just used some really long stitching needles and shoved them into the tps wires

[vinnY]

can't tap into the wires for your throttle position in the wiring harness?
my vafc is hooked up and it reports voltage for the tps :)

and i'd say WOT via holding the cable isn't the best idea
should calibrate it with the pedal only

[beeza]

haha Dsp26 :)

I'll do the needle way next time,pretty dodgy with the wires touching and shorting out.

Thanks Vinny,cheers mate,will do again with the pedal.

Will post results.

[B18cEG]

Just got a couple things to add, did you say that you couldnt get a reading of 4.5 at WOT? is your tps on properly because if its not right i have seen them read about 1v at closed and 3.xx at WOT. Also did you set your tps from WOT??? not the right way if you did but if i misunderstood i apologise, Pretty sure i wrote to you about this before, Set at closed, at as close to .45 volts as possible, dont forget to allow for multi meter inacuracy by seeing if the meter reads 5.00 volts on the 5v feed, for example if the tps 5v feed actually reads 5.12 volts subtract the .12v from the tps signal so .45 would actually read .33 (this is just a guide) best acuraccy test is to put in ohms (resistance) setting and see if it reads 0.0 ohms or is a little out) anyway .45 at closed throttle and WOT voltage will be around the 4.5 area. also always set with the pedal not by hand because it is the pedal that will control at the end of the day not your "i can turn the throttle an extra 1.2mm" hands, lastly the throttle plate adjust screw is NOT for setting TPS!!!

So remove tps.
Adjust correctly onto TB
Reinstall and set.

Thanks

PS, dont you meen Calibrating ? lol

[beeza]

haha yeah Calibrating :)

Thanks for your help!

I'm pretty sure I fitted it properly,will check that again though.

When you say:

So remove tps.
Adjust correctly onto TB
Reinstall and set.

Do you mean just loosen it off to adjust it?

How do you measure the voltage?

I'm pretty sure this and/or the 02 sensor is my problem.I will replace the 02 sensor too.

[beeza]

Inside the tps

http://i99.photobucket.com/albums/l287/beeza2/tps_sensor2.jpg

[B18cEG]

i mean before you set the tps, remove it completley and line it up properly if it is not already then reinstall (but dont tighten screws fully) then set with a multi meter, if u dont have one just get the $10 ones from ur local auto shop, they are pretty accurate, for the first few months anyway. have you done a diagnostics test yet?

[B18cEG]

i mean before you set the tps, remove it completley and line it up properly if it is not already then reinstall (but dont tighten screws fully) then set with a multi meter, if u dont have one just get the $10 ones from ur local auto shop, they are pretty accurate, for the first few months anyway. have you done a diagnostics test yet?

When testing for voltage do not add wires if your not soldering them, an unsoldered join can drop voltage from one wire to the other. just see if you can get someone to help you and test by going to the top wiring loom next to the left shock tower and there should be 2 wires at the top of the plug whick will be -green/white trace and +red/blue trace and that will give you the best reading, just strip the wire about 10mm and insert the black probe into- and red into+ and you should be set.

If any of that is unclear let me know and i will specify further.

Thanks man

[beeza]

Thanks mate,I think that must be my problem,not installing it properly.Because of it's position,you can't see into it to 'line it up properly'...

Thanks mate.

[B18cEG]

Thanks mate,I think that must be my problem,not installing it properly.Because of it's position,you can't see into it to 'line it up properly'...

Thanks mate.

No prob, let us know how u go.

Thanks

[aaronng]

Moved to the DIY section

[beeza]

Thanks Aaron!

I did it again properly and same.

3.25V is the most I can get...

I replaced the tps 4 months ago so I don't think it needs replacing?

The idle is high at 1500rpm and the engine check light is on.The ECU code check brought up a 7,the tps,so no suprise there.

It wasn't like this before...I don't get it.

On a side note,I noticed my fuel pump was whining on and off when the car was switched off and the keys out.Seems strange?

ARRGGHHHH!!!

[B18cEG]

Have you had any electronics fitted to the car recently, also are you able to get 5v on the power feed wire? i know your prob sick of taking the tps off over and over but can you remove it completley and measure the voltage with the multimeter while turning it by hand, dont forget to loosen that throttle plate screw if u havent already.

PM me ur number and i can give u a call to guide u if u need.

Thanks man

[beeza]

I'll try disconnecting the grounding kit,there's no other electrical things that I've added that would have caused it.

I've got the 5V.

I'll do the by hand test (at work atm).Will that show if the tps voltage will get to 4.5Volts?

What's the Throttle body plate?

[B18cEG]

yeah, doing it by hand will let u know if it can go less/more or about 4.5v, the throttle plate is the brass ring inside your throttle body, i think in one of the previous posts you said something about adjusting some screw on your throttle body, if so that will most definatly result in your higher idle rpm.

[beeza]

Ah,that was the idle adjust screw.It's screwed right in.If I screw it out the idle goes up.

I might need to take it to see one of the boys up in Brissy.Hard to do if ya not looking at it.

Thanks heaps mate!

[beeza]

I found http://www.honda-tech.com/zerothread?id=2153910&postid=33768518

Gotta be worth a shot :)

[beeza]

I took the tps off and turned it.I was able to get a 4.5V reading.

[beeza]

I found http://www.honda-tech.com/zerothread?id=2153910&postid=33768518

Gotta be worth a shot :)

I just want to check that my TB has this lol

If so I'm thinking I will do this monday.Then if still no go,I will replace the whole TB

[beeza]

I got a complete Throttle Body coming,only $100.So I'll clean that up and put it in.

FINGERS CROSSED!

[beeza]

I found http://www.honda-tech.com/zerothread?id=2153910&postid=33768518

Gotta be worth a shot :)

Well,I done this.The spring loaded valve is different in my d16y4,it's a exposed spring with a plastic piece on the end.I cleaned it out and put it back.I got my car to idle fine but the TPS voltage max at WOT was 2.95 Volts.I believe this spring being 12 years old hasn't retained it's spring and caused my problem.

I will try again to fix it tomorrow but I will just swap in another TB in 2 weeks.

It seems nobody knows this exists on OZHONDA.I've made numerous threads since new years...not complaining just pointing it out.

[beeza]

Yes!

Finially done it!!

The tps sensor was not in properly...

I took the TB off and cleaned it up and adjusted/fixed the spring on the bottom (FITV),put it back on and I could get a .46V reading at closed throttle.The max reading when my mate foot his foot on the accelerator (WOT) was 4.35V.It should be 4.5V but that's the best it could get.

The car goes great!!! WOOT WOOT!!

The accelertor cable needed to be adjusted too,not too tight,so when you take your foot off the pedal,it should go all the way back on TB,not slightly revving.

Thanks so much Jason for calling me and helping me out mate.Very HAPPY! :)

[beeza]

Jason,would the voltages be the same for a 89 Holden commodore,fuel injected?

[B18cEG]

Jason,would the voltages be the same for a 89 Holden commodore,fuel injected?

Sorry man not 100% sure bout commodores.

[beeza]

Cheers mate!

Car is runnin' much better!

So far...hehe

[beeza]

My problem was the 02 sensor and the Throttle body.Mainly the 02 sensor.

[kraiye]

was reading this thread out of interest and started getting ideas...

for months my car has not been detecting very light throttle. i put my foot down a little and nothing happens, put it down a little more and it lurches forward. that made it an absolute nightmare in a traffic jam! driving under 30kmh was almost impossible. i always took my tuners word for it that my TPS was on it's way out and I'd need a new one.
well... i took to it with a voltmeter tonight and found it was reading 0.43v. i tested my voltmeter on the 5v reference wire and it read 5.05v - so it was .05v out meaning my tps was actually only reporting 0.38v at idle instead of 0.5v.
I undid the 2 screws and turned my tps till it read 0.55v. now runs like a dream!!! i can hold 10kmh now with no jumping, lurching or any other bs behaviour;) (any slower though and the pro1 cams start to object).
Thanks guys. another reason i tell myself "f*k i love Oz:honda:"

by the way, to get the readings from the tps, i pushed a safety pin through the hole in the back of the plug where the middle wire comes out. then i stuck my positive terminal from the voltmeter in the little loopy bit in the safety pin. the terminal wires were long enough to let me rest the voltmeter on the windscreen so i could see it from the drivers seat. i got a photo of the voltmeter and safety pin but XP + bluetooth = frustration!!

[beeza]

Nice one.Sorry about the confusion about how to do it in this thread...

I will do a DIY on it and have this thread deleted.

I taped needles to the ends of the positive and negative probes on the Voltmeter and stuck em into the TPS wires to read it.

[kraiye]

to save a small amount of hassle, just ground anywhere.
i tested grounding to the wire and to the engine... exactly the same readings :thumbsup:

[beeza]

Oh Beautiful Kraiye!!

I was wondering about that.