Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHYUNDAI1999ELANTRA WAGON L4-2.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDESCRIPTION AND OPERATION
1999 Hyundai Elantra Wagon L4-2.0L
Engine Control Module: Description and Operation
1999 Hyundai Elantra Wagon L4-2.0LSECTION Description and Operation
ENGINE CONTROL MODULE (ECM)
The ECM monitors the input/output signals (some signals at all times and the others under specified conditions).
When the ECM detects that an irregularity, it memorizes the diagnostic trouble code, and outputs the signal to the self-diagnosis output terminal.
The diagnostic results can be read out by the Scan Tool (ST). Diagnostic trouble codes (DTC) will remain in the ECM as long as battery power is maintained. The diagnostic trouble code(s) will, however, be erased when the battery terminal or the engine control module (ECM) connector is disconnected, or erased by the Generic Scan Tool.
NOTE:
1. When battery voltage is low, diagnostic trouble codes can not be read. Be sure to check the battery for voltage and other conditions before starting the test.
2. Diagnosis memory is erased if the battery or the ECM connector is disconnected. Do not disconnect the battery before the diagnostic trouble codes are completely read and recorded.
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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.