Hyundai Coupes/Sedans 1994-1998 Repair Guide

General Information-OBD II

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The Engine Control Module (ECM) monitors both input and output signals (some signals all the time and others under specified conditions). When the ECM detects an irregularity, it sets a Diagnostic Trouble Code (DTC) and outputs the signal to the self-diagnosis output terminal.. DTC's are 5 digit alpha numeric consisting of a "P" and a 4 digit identifier. The trouble codes can only be read out by using a generic scan tool. DTC's stay in the ECM as long as battery power is maintained.

 
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