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Underlying hardware and signaling standard is same. For example, using wire that conducts electricity. Digital TTL triggers using 0-12v pulses. Initiate communications with 70ms low, then 120ms high signal. All standardised because OBD2 uses same signals as ISO-9141-2. Since OBD2 is newer standard, it incorporates backwards hardware compatibility with earlier K-line and includes it in connector.

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Problem is app for those devices are not compatible with ECM because they use OBD2 language.
Simple.
Only Honda app will talk to ECM using K-line language.
 

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Honda: INNOVA125i(2010); CBR250R(2013)
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Discussion Starter · #22 · (Edited)
Yes. Like this:
Circuit component Hardware programmer Font Audio equipment Electronic component
 
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