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Author Topic: TPS stuck at 100%  (Read 8077 times)

Offline Alex

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TPS stuck at 100%
« on: July 22, 2009, 06:15:40 pm »
Yesterday I installed my VEMS unit in my Citroën Saxo 1.6 16v VTS. I bought an assembled unit from the VEMS webshop (FW 1.0.73) and converted it to the original 3-plug (Magneti Marelli MM48P2 ECU) connector so I could use the original loom. No problems so far...

Calibrating the sensors went fine but when I got to calibrating the TPS things got weird...
 
The original Magneti Marelli ECU uses some sort of contactless TPS. In the first instance I tried to use this contactless TPS on the VEMS. Whatever I tried, calibrating and swapping the TPS pins around, I couldn't get a normal 0-100% TPS reading in Megatune. It was 100% all the time so I decided to use an analog TPS sensor instead and fitted that in place.

Everything went fine but when I got to calibrating the analog TPS sensor MegaTune still says 100% all the time. Even with the TPS connector disconnected. I tried swapping the pins at the TPS connector but had no success.

What could be wrong?

Thanks in advance

Alex
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Offline gunni

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Re: TPS stuck at 100%
« Reply #1 on: July 22, 2009, 09:49:55 pm »
Measure the resistance in your TPS and post that.
also post screenshots of your settings.
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Offline rob@vems.co.uk

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Re: TPS stuck at 100%
« Reply #2 on: July 22, 2009, 09:50:49 pm »
I take it that you have the TPS high and low set to 255 and 0?
What does the voltage read if you probe across the TPS in and ground?
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Offline Guid

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Re: TPS stuck at 100%
« Reply #3 on: July 23, 2009, 12:42:18 am »
Both read 255 after calibration. On screen-gauge is tps 100%. On the display in the car is tps; max
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Offline Guid

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Re: TPS stuck at 100%
« Reply #4 on: July 23, 2009, 12:45:08 am »
Tps-sensor works oke in an other car with vems; sensor is tested
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Offline gunni

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Re: TPS stuck at 100%
« Reply #5 on: July 23, 2009, 01:07:14 am »
It should never say 255 in both

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Offline Alex

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Re: TPS stuck at 100%
« Reply #6 on: July 23, 2009, 01:49:16 am »
I will post the measurements and settings later this evening.

Thanks
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Offline Alex

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Re: TPS stuck at 100%
« Reply #7 on: July 23, 2009, 01:52:43 am »
Quote from: rob@vems.co.uk on July 22, 2009, 09:50:49 pm
I take it that you have the TPS high and low set to 255 and 0?
What does the voltage read if you probe across the TPS in and ground?

I suppose "TPS in" means +5v TPS supply? If so, it reads 4.95 volts against ground.
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Offline gunni

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Re: TPS stuck at 100%
« Reply #8 on: July 23, 2009, 02:29:59 am »
+5 TPS supply is the voltage supply to the TPS.

Measure the voltage on pin 1 where is says TPS IN.

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Offline Alex

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Re: TPS stuck at 100%
« Reply #9 on: July 23, 2009, 06:24:26 am »
HERE are my settings (MS Excel file), HERE my config.txt and HERE are my tables.txt

I will measure the TPS IN value tomorrow when I reinstall the VEMS in the car.
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Offline Guid

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Re: TPS stuck at 100%
« Reply #10 on: July 27, 2009, 09:46:03 pm »
We got the tps working now! We set in megatune 0&255 and then calibrated the tps; succes!
Thanks for the advice.

Now we have ignition issius;
could it be in the h- settings?
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