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 Post subject: coolant temp sensor and TPS voltages.
PostPosted: Thu Nov 01, 2012 5:14 pm 
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Joined: Fri Jun 27, 2008 10:24 am
Posts: 81
Location: Newcastle NSW
Hey guys,

Is anyone able to advise me of the following voltages for a MK1 GTI??

- TPS output voltage at 100% (wot).
- TPS output voltage at 0% (closed throttle).

- Coolant temp sensor output voltage at mid temp (approx 50 C).
- Coolant temp sensor output voltage at running temp (approx 75 C).

I have some custom work being undertaken to interface to my adaptronic, but I'm working away for a month and unable to take the measurements myself!

Case of beer in it for best info!

Cheers,

-Mark.

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LWB Sierra: 1.6 Twin-cam, Twin-charged, Twin-scroll, Twin-locked.
Pauter rods, ported head, 200/335i 210/340e cams, sr20tb, ID1000's, Adaptronic e420, Garrett GTX3076r, Ogura SC14, 2x Tial MV-s, Turbosmart Dualport.


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 Post subject: Re: coolant temp sensor and TPS voltages.
PostPosted: Thu Nov 01, 2012 9:01 pm 
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Joined: Thu Oct 27, 2011 8:36 pm
Posts: 789
Location: Parramatta NSW
TPS:
Quote:
.4v @ idle, 3.7v @ WOT (with car off.)


Pulled that one off Teamswift via google. If i find my workshop manual i'll post up the voltage readings.

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 Post subject: Re: coolant temp sensor and TPS voltages.
PostPosted: Fri Nov 02, 2012 6:34 pm 
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Joined: Fri Jun 27, 2008 10:24 am
Posts: 81
Location: Newcastle NSW
Cheers, thats a good start. Now to find the values for coolant temp. Dig those up also and I'll get you a box of beer!

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LWB Sierra: 1.6 Twin-cam, Twin-charged, Twin-scroll, Twin-locked.
Pauter rods, ported head, 200/335i 210/340e cams, sr20tb, ID1000's, Adaptronic e420, Garrett GTX3076r, Ogura SC14, 2x Tial MV-s, Turbosmart Dualport.


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 Post subject: Re: coolant temp sensor and TPS voltages.
PostPosted: Fri Nov 02, 2012 7:17 pm 
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Joined: Sat Mar 08, 2008 1:07 pm
Posts: 1065
Location: Western Australia
Hi,

Fyrestorm's found readings seem about right! :D

Both sensors are resistive devices, but have entirely different characterisitics. Their basis is a 1-5V output that is received by the ECU.

Here are the factory workshop manual specs.

TPS signal:

0-1V with ingnition switch ON and throttle at idle position.
3.0-5.0V with ignition switch ON and throttle at full open position. (WOT)

The TPS is basically a sliding potentiometer so the output voltage signal to the ECU is linear and is rather easy to plot.

Then it gets a little interesting...

WTS signal:

1.0V-3.0V Ignition switch ON with engine cooling temp at 80 degrees C.

With the water temp sensor, the resistance curve of the sender is NOT linear- it is a logarithmic curve! Meaning that to get a linear result a square root factor needs to be applied by the ECU.
Attachment:
GTI WTS sensor.JPG
GTI WTS sensor.JPG [ 191.78 KiB | Viewed 59 times ]
You can use Ohm's law to figure it out from the above table, but the best way to get a midway point reading is to actually go out to the car with a thermoter and voltmeter! Just remember that the reading isn't linear!

Apologies for the vague reply, but I hope it helps in some way...

Cheers,

Drew

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