Hyundai Coupes/Sedans 1994-1998 Repair Guide

General Information-OBD II


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.