1993 Hyundai Elantra GLS, AutomaticFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

NOTE: Trouble codes will be recorded at various operating times. Some codes require operation of sensor or switch for 5 seconds; other components require operation for 5 minutes or longer at normal operating temperature, vehicle speed and load. Therefore, some codes may not set in a service bay operational mode and may require road testing vehicle in order to duplicate condition under which code will set.
  1. Ensure all engine systems other than computerized systems (i.e. compression, ignition, etc.) are operating properly. DO NOT proceed with testing unless all other problems have been repaired. If MIL light is illuminated, see RETRIEVING CODES (NON-SCAN)  or RETRIEVING CODES (SCAN TESTER)  . For diagnosing hard codes, see FAULT CODES  to determine cause of malfunction. See DIAGNOSTIC TESTS  for test procedures corresponding to fault codes.
  2. For diagnosing intermittent codes, proceed to INTERMITTENTS in TESTS W/O CODES article in ENGINE PERFORMANCE section. Inspect condition of system harness by conducting recommended voltage or continuity checks. See WIRING DIAGRAMS article in ENGINE PERFORMANCE section for additional information on specific circuit configuration. Inspect condition of individual component. Repair or replace component as needed.
  3. Recheck system operation after repair is made. If trouble code still is present, substitute ECM with known good unit. Verify that system is repaired. After repairs have been completed, clear trouble codes. See CLEARING CODES  .
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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