Bosch HFM 5 Views. 3 years ago. No tags were found READ. Bosch HFM 5 READ. Show more . Robert Bosch GmbH. Automotive Aftermarket. Postfach Karlsruhe . Germany Hot-film air mass meter, type HFM 5. Bosch: – 5 way Female Compact Connector m for Bosch HFM5 Airflowsensor.

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The one I’m using was used in many VWs around – or so.

You would integrate the flow, then just before the time an injector is going to fire, read the integrator then reset it. Board index All times are UTC. As far as I know the MS3 firmware doesn’t support negative flow values, I’m not even sure what one would do with that info?

I do not believe that V1. The way the MS firmware works if it sees an input value below the lowest entry in the table, it’ll just use the number corresponding to the lowest entry.

Thanks for the replies. I noticed that some Bosch data sheets show the negative flow reading and some just show the sensor output starting at 1 volt and don’t publish the volt data at all.


I can supply, repair or upgrade Megasquirts in UK. Return to MS3 General Support. America needs more lerts. The HFM2 is open to both forward and reverse flow equally whereas the HFM5 is open only to forward flow and the data sheet claims that it accounts for reverse flow.

Air Flow Sensor | Autoscope

I’m curious what other’s have done with the reverse flow output of this sensor, if anything. Or in this case, in less gibberish terms, the Megasquirt will see 0 flow for all voltages of 1.

I’m hoping the Bosfh will do a better job.

See also MS3 manuals. It also outputs a V signal but the difference is that no flow produces 1V output.

Air Mass Sensor 0281002447 Bosch Flow Meter 2816427000 Hfm5 Quality Replacement

I think the HFM5 sensor and similar sensors can sense the reverse flow and take it into account and still produce a positive flow reading as long as the positive flow is greater than the negative flow. I’m considering upgrading to the Bosch HFM5 sensor that does have reverse flow detection. I do not expect to need the negative flow output range volt. This is a pretty old late 80’s – early 90’s MAF sensor that returns a V signal and has no reverse flow detection. Thanks for the information!


Google [Bot] and 3 guests. I will see in a week or so when I install it on my engine.

It would be a fundamentally different way of calculating fueling. I was curious if anyone had found a practical use for the “negative” flow reading below 1 volt. Users browsing this forum: Is anyone else using one of these sensors? The integrator value would then be used to calculate the amount of fuel to inject.