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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Users browsing this forum: Thanks for the replies. You would integrate the flow, then just before the time an injector is going to fire, read the integrator then reset it.

Air Mass Sensor 0281002447 Bosch Flow Meter 2816427000 Hfm5 Quality Replacement

Thanks for the information! I will see in a week or so when I install it on my engine. I do not expect to need the negative flow output range volt. See also MS3 manuals.

America needs more lerts. I’m curious what other’s have done with the reverse flow output of this sensor, if anything. The way the MS firmware works if it hfj5 an input value below the lowest entry in the table, it’ll just use the number corresponding to the lowest entry.


The integrator value would then be used to calculate the amount of fuel to inject. 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. It would be a fundamentally different way of calculating fueling. This is a pretty old late 80’s – early 90’s MAF sensor that returns a V signal and has no reverse flow detection.

Megasquirt Support Forum (MSEXTRA)

Return to MS3 General Support. Google [Bot] and 3 guests. Or in this case, in less gibberish terms, the Megasquirt will see 0 flow for all voltages of 1. 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.

It also outputs a V signal but the difference is that no flow produces 1V output. Is anyone else using jfm5 of these sensors?

Megasquirt Support Forum (MSEXTRA) • Bosch HFM5 MAF sensor with return flow detection (View topic)

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


I was curious if anyone had found a practical use for the “negative” flow reading below 1 volt. I’m considering upgrading to the Bosch HFM5 sensor that does have reverse flow detection.

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? Board index All times are UTC. I do not believe that V1. I’m hoping the HFM5 will do a better job. Nfm5 can supply, repair or upgrade Megasquirts in UK.