Tremo

Is there any way to test a MAF without actually putting it on a car and seeing if the ecu throws codes?

Tuned Performance

iTrader: (92)

You can watch the gps with tuner pro rt.

GeneralDisorder

iTrader: (1)

Sure - stick it in a flow bench, give it power, and check the voltage output against the MAF scaling table in the ECM.

GD

GeneralDisorder

iTrader: (1)

Well - he did ask about checking it OFF the car..... so I'm thinking that's not an option.

GD

Vader

Agreed. In lieu of a flow-controlled air pump, however, a general indication of whether the MAF is outputting anything relatively normal would be to power the "E" terminal with a +12V supply, ground the "A" and "B" terminals (0V), and monitor the 0-5VDC output at the "C" terminal while pumping air through it using a shop vacuum. Varying the distance from the downstream air connection of the MAF to the vacuum cleaner hose should vary the MAF analog signal level. It won't be calibrated, but it will indicate if the MAF is functioning at all. and with some relative variation.

GeneralDisorder

iTrader: (1)

Incidentally, if you DO check it on the car, the general rule of thumb is 1 gram per second per liter of engine displacement. So you want to see *around* 5 grams per second at a standard 750 RPM idle. To check the MAF at WOT you can then do a volumetric efficiency calculation.

GD

Tremo

Tanks, guys!

I have two MAFs plus the one on the car. I'd like to see if the ones in boxes still work or if I should just toss them. One is a Bosch.

Tremo

I guess I'm trying to see if the wire is broken. Maybe if I could apply power to the burnoff and look inside to see if the wire is glowing. If the fine wire is broken, obviously there would be no glow. If there is glow, the wire is intact. You think this is possible? if so then I could proceed to try to power it and read the signal voltage using a shop vac to get some airflow.I