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Discussion Starter #1
Would really appreciate some input.

My Ducati Multistrada 1200s 2010 has been jerking and cutting out, especially as I roll off the throttle. I suspected the TPS.

TPS secondary signal starts at 0.5V and climbs steadily to 4.8V (as it should) as I twist the throttle.

But TPS primary signal voltage starts at 2.44V ? and jumps around to 4.8V as I twist the throttle. How can that be such a high starting voltage? Short to voltage or a short to ground or bad earth somewhere?

I changed the throttle body (I have 4) and exactly the same situation.

Changed the ECU (2 spares) and no change.

Went through the manual and checked all the ECU pins and anything that is a ground and added an extra wire to ground them. = no change.

The primary and secondary TPS share the same power circuit and reads 4.99V.

Tried with the rapid bike EVO connected and disconnected. No change.

Tested APS and both primary and secondary sensors work fine and gives a clear pyramid signal on my Pico Auto scope as I open and close the throttle. TPS waveform is rather noisier (even with the lead properly grounded).

Checked the wiring harness both visually (by removing all the wrapping) as well as ohm testing the wires and grounds (disconnected from ECU). Some of the sensor earths don’t ground without the ECU plugged in.

I’m fresh out of ideas. Some more experienced input would be most welcome.

MTS1200s 2010 with Rapid bike EVO.
 

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Discussion Starter #5
That’s a shot from my picoscope. Maybe the voltage is meant to start at 2.5V on the secondary sensor???
 
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