TPS Signal - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 07-26-2008, 10:59 PM   #1
Hear me Meow
Thread Starter
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,993
Total Cats: 13
Default TPS Signal

My TPS isn't reading in MS. It reads with the stim just fine.

I checked the pin on the harness and it reads varying resistance depending on where I go with the accelerator, and it reads from the same pin as the stim but I can't seem to make megasquirt show this.

The resistance from the stim is between 7 and 600 ohms. The resistance from the TPS in the car is between 480 and 1690ohms (that's foot off to foot on the floor)

It's just not making sense to me.
skidude is offline   Reply With Quote
Old 07-26-2008, 11:07 PM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,847
Total Cats: 1,788
Default

did you calibrate it?
Braineack is offline   Reply With Quote
Old 07-26-2008, 11:12 PM   #3
Hear me Meow
Thread Starter
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,993
Total Cats: 13
Default

I've tried but when I press "Get Current" it just gets 0 both times.
skidude is offline   Reply With Quote
Old 07-27-2008, 12:36 AM   #4
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,914
Default

First, the TPS is not read by the MS as a variable resistance, it's read as a variable voltage. You put +5 on one side, ground the other, and you now have a voltage divider. As the wiper moves across the TPS resistor, the voltage at the wiper varies from 0 to 5v.

You did hook up +5Vref to pin 2K (light green / white) and you grounded pin 2D (black / blue), yes? Measure with a voltmeter between 2M (red / blue) and GND with the MS powered up and you should see the voltage vary from .5 to 4.5 (or so) as you depress the pedal.
Joe Perez is offline   Reply With Quote
Old 07-27-2008, 12:48 AM   #5
Hear me Meow
Thread Starter
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,993
Total Cats: 13
Default

Quote:
Originally Posted by Joe Perez View Post
You did hook up +5Vref to pin 2K (light green / white) and you grounded pin 2D (black / blue), yes?
Nope. I put it on and now it seems to work flawlessly.

Thanks! Now if I can only figure out this fan thing by myself, I will have accomplished something without running to the forum.
skidude is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1.8 TB/TPS for use with 1.6 wiring Elfering MEGAsquirt 17 12-16-2016 07:44 PM
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
ms2e No Rpm Signal Dobzeh ECUs and Tuning 5 09-17-2015 03:56 PM
BMW TPS / P&P TPS for Megasquirt albumleaf WTB 0 09-10-2015 10:28 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:26 AM.