Nor Are They Ecu Fault Codes

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

Data Element


lent Recording Interval2 Sampling Rate

Change in forward speed

0 to 250 ms

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