Hello all,

I'm a little confused about the mbox Hitachi MAF.  I'm trying to understand the Linearization table (MLHFM) in an attempt to get a valid voltage/flow graph.

Bosch MAFs have an offset, as the sensor reads negative flow below 1v.  The Bosch stuff makes sense to me.  The offset is defined by MLOFS, and is 2000 decimal, or 200 KG/H, which makes the Bosch MLHFM table sane, causing 1.0v to equal 0kg/h after the offset is applied.  Good stuff.

I thought I understood the Hitachi table, until I read: http://s4wiki.com/wiki/Mass_air_flow#Signal_conditioning

The S4Wiki indicates the Hitachi MAFs also have an offset; with the sensor reading 0 kg/h at 0.5v.  But as the Hitachi MLHFM table starts at zero and works it way up, and MLOFS is set to zero, it would seem the Hitachi MAF does not have an offset, and starts reading positive flow directly above 0v?

I must be missing something?  Any insight appreciated!

Thanks for looking

Contrary to popular opinion, Bosch>Hitachi.

At least in this mans opinion.