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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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This is a pretty old late 80’s – early 90’s MAF sensor that returns a V signal and has no reverse flow detection. Return to MS3 General Hdm5. It would be a fundamentally different way of calculating fueling.

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. As gosch as I know the MS3 firmware doesn’t support negative flow values, I’m not even sure what one would do with that info?

Thanks for the information! Board index All times are UTC.

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I do not believe that V1. America needs more hhfm5. The integrator value would then be used to calculate the amount of fuel to inject. Or in this case, in less gibberish terms, the Megasquirt will see 0 flow for all voltages of 1. It also outputs a V signal but the difference is that no flow produces 1V output.

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

I’m curious what other’s have vosch with the reverse flow output of this sensor, if anything. I will see in a week or so when I install it on my engine. 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.

I’m hoping the HFM5 will do a better job.

Air Flow Sensor | Autoscope

Google [Bot] and 3 guests. 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. 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.


Is anyone else using bossch of these sensors? I was curious if anyone had found a practical use for the “negative” flow bozch below 1 volt.

I can supply, repair or upgrade Megasquirts in UK. See also MS3 manuals.

The one I’m using was used in many VWs around – or so. I’m considering upgrading to the Bosch HFM5 sensor that does have reverse flow detection. Users browsing this forum: Thanks for the replies. I do not expect to need the negative flow output range volt. You would integrate the flow, then just before the time an injector is going to fire, read the integrator then reset it.