Alfa 159 2.2 JTS - Air Quantity vs Mass air flow (throttle closed)

[LeighF]

Good day

I am trying to diagnose a possible faulty MAF sensor. My vehicle is a 159 2.2 JTS.

1. Air temperature seems to be reading fine on the sensor.
2. I get a reading on the Air Quantity parameter. But... on the "Mass air flow (throttle closed)" parameter it remain on a 0 Kg/h reading with no change with REVS.

Can anyone please help me out and tell me the difference between Air quantity vs Mass air flow?

Also would a 0 Kg/h reading indicate a faulty MAS sensor.

Symptoms include rough idle at cold start, hunting at idle, and struggle to start the vehicle when cold.

[abarthmultijet]

Try to disconnect the maf sensor, the vehicle goes into a worst case scenario but still works. If the engine running improves with the maf sensor disconnected than you have a faulty maf sensor.