Forgot to update this used 4 10w bulbs to take the EGR out of it. So when I bi-directionally control say 100 steps (first activity) it, it's a mess with the ECU not pulling the load to ground. 2022-12-06_22-00.png But when it then reverts back after a few seconds, its perfect. As these are just resi...

Whist waiting for the feature you might find the cross platform opensource program Flameshot useful. Screenshot and annotations in one, very quick and simple. https://flameshot.org/
Example :

One of my favourite garage customers stripped of some parts and pulled the cam sensor which was a complete nightmare. Despite what the new owner had been told it was the original sensor! It also seemed to be very loose in it's holder and a bit far out. Replaced with a new sensor that the garage had ...

Thanks!

Hi Vasek Thanks again for your input, I had been trying to find a reference WF so that's really helpful - though the CMP i have is inverted from that sample. I'm no stranger to problems being the "new" parts, however the pattern does not seem to be chaotic, with one exception in 5 mins of running th...

2011 Citroen Dispatch 1.6HDi Intermittent Hard start, had at least 3 cam sensors, just had the engine out to drill out the cam sensor bolt and re-fit a new sensor. Still setting intermittent sensor codes. I get to it and scope the CMP sensor wire at the ECU as it's impossible to get to. This is what...

Thanks again Vasek. An emulator is a great idea (10W bulbs should be pretty close) - as is scoping the MAF, as my ears were telling me that despite asking for 100 steps on the scan tool I had no change in engine note. I'll get back on it next week. If I need to, can I re-code a used ECU with Techstr...

I saved the red trace as a reference then aligned it with the blue. Looking at the odd section and comparing them I think the ECU may be struggling to pull it to ground. The vertical drop is vertical as if it is being switched. 2022-11-16_23-50.png Also looking a the current it seems to reverse at t...

That's brilliant, thanks for your time to extract that and post it. Makes more sense now. I would suspect the MAF sensor but when they replace the EGR valves it gets better and the code goes for months. The waveform they show appears to have the wrong scale on it but mine still has that drop out on ...

Got back on this today Pic and waveform attached. According to scan tool control I asked for steps to 50 (out of 125) it then seems to revert to 0 or 2 in this case however there was no change in engine note at all. The car however on sporadically sets a code. really need a known good to call it ano...