senordos Posted January 11, 2022 Report Share Posted January 11, 2022 Hello, Is there a way to check that there is a signal exiting the ECU on the CAN wires? Using a Link G4+ Fury - I have wired into the CAN 2 H & L outputs and have setup the CAN 2 settings in the ECU config, but I'm not getting expected results (any results) on my external dash. I'd like to just check that the wiring is "ok", but being a data line I assume it's not as simple as checking if I get 5V or something on the line! For info: I'm setting up a Race Technology DASH2 (not PRO) so using a serial converter. The converter appears to be working, but isn't showing anything on the input side... I am just trying to rule out ECU setup / wiring issues. Thanks for any help, Christian Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 11, 2022 Report Share Posted January 11, 2022 Yes you can measure voltage to ground. When there is no data both CAN H & L will sit at about 2.5V. When there is data you will see higher voltage on CAN H and lower voltage on CAN L. It varies with how much data is being sent but typically you will see about 3.5V on CANH and 1.5V on CAN L if there is data. Quote Link to comment Share on other sites More sharing options...
senordos Posted January 11, 2022 Author Report Share Posted January 11, 2022 Thanks Adam... I'll check that. Much appreciated. Quote Link to comment Share on other sites More sharing options...
senordos Posted January 15, 2022 Author Report Share Posted January 15, 2022 Thanks again Adam. Checked this and appears to be working. With multimeter earthed to block CAN H - 3.2V CAN L - 1.9 V If I turn CAN2 off in the ECU, I get 2.2 V on both. Cheers for your help. Christian Quote Link to comment Share on other sites More sharing options...
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