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

EVENT DATA RECORDER INFORMATION1

lent Recording Interval2 Sampling Rate

Change in forward speed

0 to 250 ms

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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