Hello Expeerminter (Can I have your name please? )
I have some waveforms from a differential pressure sensor, that I captured, whilst applying a vacuum & then pressure. I have never bothered capturing the signal from the temperature sensors though. They don't seem to give any problems.
I find it more convenient to study the pressure readings vie serial data. By observing the pressure reading at "key on engine off" & then running the engine at a variety of speeds, it is possible to determine if the sensor is functioning correctly & furthermore, if the DPF is clogged, partially clogged, or even clear. Some back pressure is necessary, otherwise a DTC will be set for "Particulate filter punctured"
Most good diagnostic tools can display "differential pressure sensor" parameters. I use Peugeot Planet, but I have seen the same data on other tools too.
I can't lay my hands on the waveforms at the moment (I have misplaced my USB 500GB portable drive )
From memory the waveforms were fairly unexciting & you shouldn't have any problem in finding a donor car, so that you take some good reference captures from.
I will look out for my captures & post them when I get time.
Due to rather long winded internal funding and requsitioning processes, I will not have a scope
to play around with for about 8 weeks.
I would be most grateful if you could describe the typical DPF signal.
For example, is it 2.5 V downto zero when pressure is applied in one direction, 2.5 upto 5 when applied the other way - in other words differential outputs like would be fed into a single supply op amp?
Or is it simply vehicle ground to 5 V, with a 5V supply to the sensor? Is it two wire only? Is it relative to vehicle ground or a floating situation?