Diy Afm Testing?

[D-limo]

Hi have a Z32 AFM here. Need to check its condition properly before I go try selling it. Last time I looked at getting my RB20 one checked I think I was quoted around the $30-$40 mark!!

Apparently it is possible to test using a multi-meter.. If you know please tell.

Cheers.

[RedDrifter]

Yeah its not to difficult.

All you need is a 12 volt power supply, a fan and a multimetter.

Hook the power supply positive to pin 5 and the negative to pin 3.

Now hook the multimeter positive lead to pin 2 and the ground lead to pin 4.

You should once power is put the the afm see a voltage of around 0.5volts with no air flow.

Now turn on the fan and see if the voltage increases to around 2.5 volts.

This could be more or less depending on how much air the fan will blow.

A variable speed fan is best as it allows you to test the afm at different levels of air flow (more air more voltage).

The pin out of the afm is the same as the RB20 unit so if you get confused have a look at http://rb20det.com/air_flow_meter_pinout.html

Hope this helps

[D-limo]

You are a legend

Cheers heaps.

[Munkyb0y]

Does that work the same for R33 RB25DET standard AFM ?

[RedDrifter]

Yes however I am unsure if the R33 afm pinouts are the same as the z32 or the R20.

[Munkyb0y]

Yes however I am unsure if the R33 afm pinouts are the same as the z32 or the R20.

cool, will have to get the correct pin outs.

nothing actually wrong with my afm, but good to know.

my fuel consumption seems quite high, just changed my O2 sensor, but not too confident it will fix anything.

would afm affect fuel economy? i dont really think it would. by my reasoning (which isnt that great) i would think a dirty afm would show less airflow and therefore adjust to leaner mix rather than richer.

????

[RedDrifter]

I know this is off the topic and I don't wanna ijack the thread but could someone tell me what the inlet diameter of the Rb20/25 turbo is?