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

I’m hoping the HFM5 will do a better job. Thanks for the replies. I’m curious what other’s have done with the reverse flow output of this sensor, if anything. I’m considering upgrading to the Bosch Htm5 sensor that does have reverse flow detection.

America needs more lerts. 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.

Megasquirt Support Forum (MSEXTRA)

Users browsing this forum: I will see in a week or so when I install it on my engine. 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?


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.

Return to MS3 General Support. I do not believe that V1.

Or in this case, in less gibberish terms, the Megasquirt will see 0 flow for all voltages of 1. Thanks for the information!

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

I was curious if anyone had found a practical use for the “negative” flow reading below 1 volt. Google [Bot] and 3 guests. See also MS3 manuals. The integrator value would then be used to calculate the amount of fuel to inject.

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

Bosch plug – female – Receptacle – DeyTrade

It would be a fundamentally different way of calculating fueling. 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 bksch a positive flow reading as long as the positive flow is greater than the negative flow. The one I’m using was used in many VWs around – or so.


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

You would integrate the flow, then just before the time an injector is going to boech, read the integrator then reset it. I can supply, repair or upgrade Megasquirts in UK.