Quote:
Originally Posted by chibo
What does the OBD2 scanner actually read? Does it get actual RPM numbers or anything? Does it just check that the ECU sends READY for everything?
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the obd2 check is a functional check. it checks to see if the monitors are complete (all but 2 must be complete in all 96 and newer vehicles) it checks to see if a dtc is in the ECU (automatic fail, no exceptions) and for an RPM signal during the smog test. i know someone is going to ask, so no, you cannot just reset the check engine light. the smog machine hooks up into the ecu, and will automatically fail you because the monitors are not complete. so to pass the obd functional, you should be able to read rpm from your diagnostic connector, all but 2 monitors must be set to "ready", and you must not have a check engine light/dtc