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.

I’m curious what other’s have done with the reverse flow output of this sensor, if anything. Return to MS3 General Support. It also outputs a V signal but the difference is that no flow produces 1V output.

The integrator value would then be used to calculate the amount of fuel to inject. 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. America needs more lerts.

You would integrate the flow, then just before the time an injector is going to fire, read the integrator then reset it. It would be a fundamentally different way of calculating fueling.


Bosch 1 928 403 836 – 5 way Female Compact Connector 1.1m for Bosch HFM5 Airflowsensor

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. Or in this case, in less gibberish terms, the Megasquirt will see 0 flow for all voltages of 1. Board index All times are UTC.

I do not believe fhm5 V1. Thanks for the information! I’m considering upgrading to the Bosch HFM5 sensor that does have reverse flow detection. I was curious boscn anyone had found a practical use for the “negative” flow reading below 1 volt. 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?

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Is anyone else using one of these sensors? I do not expect to need the negative flow output range volt.


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. See also MS3 bsch.

Bosch 1 928 403 836 – 5 way Female Compact Connector 1.1m for Bosch HFM5 Airflowsensor

The HFM2 is open to both forward and reverse flow equally vosch the HFM5 is open only to forward flow and the data sheet claims that it accounts for reverse flow. Thanks for the replies. I’m hoping the HFM5 will do a better job. I will see in a week or so when I install it on my engine.

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This is a pretty old late 80’s – early 90’s MAF sensor that returns a V signal and has no reverse flow detection.

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