Stranger24 Posted December 20, 2023 Report Share Posted December 20, 2023 How can one find out if he is having ground offset issues on analogue signal to ecu? Quote Link to comment Share on other sites More sharing options...
dx4picco Posted December 20, 2023 Report Share Posted December 20, 2023 when the voltage measured between ECU AnVolt and ECU sensor ground pin, differs to the voltage measured on the sensor pins itself (Signal pin to ground wire) Quote Link to comment Share on other sites More sharing options...
Stranger24 Posted December 20, 2023 Author Report Share Posted December 20, 2023 Would you use multimeter to test and worn this out?? Quote Link to comment Share on other sites More sharing options...
dx4picco Posted December 20, 2023 Report Share Posted December 20, 2023 yes Quote Link to comment Share on other sites More sharing options...
Adamw Posted December 20, 2023 Report Share Posted December 20, 2023 Typically there will be some method to force the analog output to a specific voltage. For example with an AEM wideband when you unplug the sensor the controller will output a constant 2.5V, you can then look at the voltage reported on the ECU AN Volt input to confirm it matches. You can then plug the sensor back in but leave it hanging in free air so the controller then outputs the full lean signal of 5.0V to give 2 calibration points. Then you check the same 2 voltage points with heavy chassis electrical load working (ie head lights on full beam, all fans, ac and demisters on). The problem with many lost cost analog devices is the output references the power supply ground so no matter how good your wiring is, the calibrated value will change as electrical load through the chassis changes. Quote Link to comment Share on other sites More sharing options...
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