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  1. J

    Looking for simplest ELM327 command to test if ECU is on

    We are developing an ELM327-based device and need to send a command just to test whether the car's ECU is on or not. For all other vehicles I've tested with, simply sending the command "0100" (to query the supported PIDs for Mode 1) is sufficient. If the ECU is ON, it will return a valid...
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