TDV6 MAF sensor bad?

Afternoon all. I'm working on a Landrover Discovery 3, 2008 model with a 2.7 TDV6 engine. It's in a crank no start situation there's a lot of variables I've gone through like fuel pressure timing etc which I believe to be within spec. Autologic live data steam is showing MAF at zero. Can this cause a no start? I wouldn't think so but I scoped the MAF sensor and don't like what I am seeing. KOEO it this weird fluctuation between 0.2 & 4v and nothing changes whilst cranking. KOEO with the MAF disconnected I get a 4.8v smooth flat line ?

Any ideas here?

This was the KOEO scope wave form. I've not seen anything like this before on a MAF sensor. No change in signal during cranking.

Not sure if this is repaired but I also had a bit of a floating ground issue with the cam over crank capture as well.

I do believe your maf is toast. As for the cam crank waveform when you have maf unplugged does the cam crank waveform clear up? I would check all of the sensors that share that 5v ref and ground.

Thanks Hardtop. Cam and crank stay the same with MAF disconnected. I recall seeing in one of Paul's videos that sometimes you will get a floating earth and it's not too much to work about? ECM ground is good.

I'm inclined to agree that MAF could be faulty BUT I'm also thinking that there has to be a circuit inside the ECM that pulls the voltage down to 2v KOEO and possibility malfunctioning and giving me this oscillation?

If you have a 5 volt adjustable voltage regulator you could test that thought or jumper the 5 volt ref to the signal wire with a dial resistor and see if it is steady. But with what i see and what you said maf is bad in my opinion. With steady 5 volt reading (4. in your case unplugged and no noise compared to lots of noise and drastic fluctuation. This can cause a no start because with it going from 0.2 to 4.8 while cranking and not cranking the cpu cannot adjust the fuel correctly fast enough to get it to start since it thinks there is more air getting into engine than there really is.

The voltage signal is controlled by the maf not the ecu. The only things controlled by ecu is injectors, iac, fuel pump on time if part of system design, throttle actuator controler motor if part of system design, pwm for tcc solinoid, etc...

A sensor to have its circuit regulated by ecm i have never seen.