Don't confuse an EDR with an Engine Control Unit's feature of storing fault codes.
Fault codes are retained by a car's ECU for purposes of later diagnosis by technicians. Some of these are part of OBD-II emissions control compliance as well. They're the sort of thing illuminating your car's Check Engine Light.
On-Board Diagnostics equipment has been required of all new cars sold in the U.S. since the mid-1990s, SAE J1979 defines a protocol of access as well as a list of operational data that might be included. There's a standardized 2 x 8-pin connector that must be located
EVENT DATA RECORDER INFORMATION1
lent Recording Interval2 Sampling Rate
Change in forward speed
0 to 250 ms
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