TPS not reading.

For discussing how to choose sensors and create a wiring harness for all Bowling and Grippo versions of the MegaSquirt® EFI controller.
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corso
MegaSquirt Newbie
Posts: 8
Joined: Sun Jul 06, 2008 11:39 am

TPS not reading.

Post by corso »

I have a V2.2 board I upgraded with the MS2 daughter card and now the TPS sensor won't register. When I have the stim pluged in and turn the CLT knob back and forth, both the coolant gauge and throttle position gauge move. I have tried reloading the code and it still does the same thing. Any input would be great
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Matt Cramer
Super Squirter
Posts: 2951
Joined: Sat Jul 03, 2004 11:35 am

Re: TPS not reading.

Post by Matt Cramer »

Check the voltage at the ADC input pins at the daughter card and see if they both move in response to one knob. Could be you have a stray bit of flux or solder blob shorting something together.
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corso
MegaSquirt Newbie
Posts: 8
Joined: Sun Jul 06, 2008 11:39 am

Re: TPS not reading.

Post by corso »

Which two pins? just want to make sure. And the board is clean.
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Matt Cramer
Super Squirter
Posts: 2951
Joined: Sat Jul 03, 2004 11:35 am

Re: TPS not reading.

Post by Matt Cramer »

The pins on the U1 daughter card. TPS is pin 26, AD3-1. CLT is pin 25, AD2-1.
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corso
MegaSquirt Newbie
Posts: 8
Joined: Sun Jul 06, 2008 11:39 am

Re: TPS not reading.

Post by corso »

CLT moves by itself, TPS dosen't move at all
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corso
MegaSquirt Newbie
Posts: 8
Joined: Sun Jul 06, 2008 11:39 am

Re: TPS not reading.

Post by corso »

so what should I do next?
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Matt Cramer
Super Squirter
Posts: 2951
Joined: Sat Jul 03, 2004 11:35 am

Re: TPS not reading.

Post by Matt Cramer »

Make sure it's getting a TPS voltage from the Stim.
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corso
MegaSquirt Newbie
Posts: 8
Joined: Sun Jul 06, 2008 11:39 am

Re: TPS not reading.

Post by corso »

yes, I get a reading off the stim
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Matt Cramer
Super Squirter
Posts: 2951
Joined: Sat Jul 03, 2004 11:35 am

Re: TPS not reading.

Post by Matt Cramer »

Check the circuit and see where the voltage is disappearing.
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corso
MegaSquirt Newbie
Posts: 8
Joined: Sun Jul 06, 2008 11:39 am

Re: TPS not reading.

Post by corso »

when I touch the top of the daughter card with my finger,the TPS gauge bounces around
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corso
MegaSquirt Newbie
Posts: 8
Joined: Sun Jul 06, 2008 11:39 am

Re: TPS not reading.

Post by corso »

also, how do I go about checking the circuit?
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Matt Cramer
Super Squirter
Posts: 2951
Joined: Sat Jul 03, 2004 11:35 am

Re: TPS not reading.

Post by Matt Cramer »

Use a multimeter. Follow the voltage in from the DB37 connector, through the circuit here:

Image

Find where it disappears.
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corso
MegaSquirt Newbie
Posts: 8
Joined: Sun Jul 06, 2008 11:39 am

Re: TPS not reading.

Post by corso »

So I check at the R9 R5 and R2 and they all move on the multimeter.
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