Taking two readings from one sensor

[chris52]

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

 

[Diver300]

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.