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I am new in OBD2 programming. I have my device connected through serial port to OBD2. I try request RPM or Speed messages and getting "SEARCHING..." or "NO CONNECT" messages instead of a RPM/Speed values. I tried to send "ATZ" and even "ATSP00" commands before the RPM/Speed request, but it still the same issue.
What am I doing wrong?

Anthon
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Vugar
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1 Answers1

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Chances are you have a faulty OBD2 adapter or you don't have the ignition on or your car speaks a l1/l2 protocol that your adapter does not support.

Make sure to issue ATSP0\r\n before 0100\r\n. If you still don't get any answer and ignition and/or engine is on, then check with another OBD2 adapter.

DrMickeyLauer
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