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Taking two readings from one sensor

Discussion in 'Automotive Electronics' started by chris52, Jul 21, 2017.

  1. chris52

    chris52 New Member

    Joined:
    Jul 21, 2017
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    Hi Guys new here with a hopefully simple question.
    I am fitting a second ECU to my car that controls ignition. My question is can I use the signal output from the Mass Airflow Meter (which is currently wired to the ECU for the fuel ) for the ignition as well or will this cause problems with one or the other.

    Many thanks indeed for your help
    Chris
     
    chris52, Jul 21, 2017
    #1
  2. Diver300

    Diver300 Well-Known Member

    Joined:
    Oct 19, 2007
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    Location:
    England
    Generally, no.

    Some sensors have an output, such as a voltage, that can be taken to various ECUs. However most sensors are variable resistances so the ECU puts out current to the sensor and measures the voltage. If two ECUs like that are connected to one sensor, both will read the value incorrectly.
     
    Diver300, Jul 27, 2017
    #2

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