October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.
Engine Control Module (ECM)
 Courtesy of HYUNDAI MOTOR AMERICA
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Engine Control Module (ECM) malfunctions are detected by using a checksum technique for verifying data. The digital data is composed of zero and ones. A checksum is the total of all ones in a string of data. By comparing the checksum value with a stored value, a malfunction can be detected.