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Thread: GM MAF Output Signal

  1. #1

    GM MAF Output Signal

    Any one know the output voltage vs frequency for a GM delphi MAF sensor?
    Last edited by Zero4488; 02-15-2014 at 10:45 PM.

  2. #2
    Senior Tuner DSteck's Avatar
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    I'm not sure what you're asking. The MAF outputs a logic level frequency based on airflow.

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  3. #3
    Quote Originally Posted by DSteck View Post
    I'm not sure what you're asking. The MAF outputs a logic level frequency based on airflow.
    The output frequency has to correlate to a voltage, no?

  4. #4
    Senior Tuner DSteck's Avatar
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    It's always on a 5v level. If you want to convert it to a voltage, you either need to program a microchip to do it for you, or make a digital to analog converter with a LM2917.

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  5. #5
    Senior Tuner mowton's Avatar
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    Could measure the rms value...treat it like AC.

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  6. #6
    Tuner in Training
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    The MAF outputs a voltage waveform that swings between 0 and 5V and whose frequency is proportional to the airflow. You can measure the average or the RMS value of the voltage with the appropriate voltmeter, or you can look at the frequency with a scope. Unfortunately with an approximately square wave of 50/50 duty cycle the average and the RMS value will not change with frequency. If the waveform is PWM (pulse width modulated) then you will see different voltages. I believe the MAFs on LS engines are of the former type.

  7. #7
    Senior Tuner DSteck's Avatar
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    It's frequency modulation.

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