TPS stuck at 100%

Alex · July 22, 2009, 06:15:40 PM

Yesterday I installed my VEMS unit in my CitroÃ«n 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

gunni · July 22, 2009, 09:49:55 PM

Measure the resistance in your TPS and post that.
also post screenshots of your settings.

[email protected] · 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?

Guid · 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

Guid · July 23, 2009, 12:45:08 AM

Tps-sensor works oke in an other car with vems; sensor is tested

gunni · July 23, 2009, 01:07:14 AM

It should never say 255 in both

Alex · July 23, 2009, 01:49:16 AM

I will post the measurements and settings later this evening.

Thanks

Alex · July 23, 2009, 01:52:43 AM

Quote from: [email protected] 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.

gunni · 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.

Alex · 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.

Guid · 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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TPS stuck at 100%