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 MANUALSHYUNDAI1994ELANTRA BASE, 1.8 MREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSRELAYSMFI CONTROL RELAY
1994 Hyundai Elantra Base, 1.8 M
MFI Control Relay
1994 Hyundai Elantra Base, 1.8 MSECTION MFI Control Relay
- Remove control relay, located behind driver's dash panel next to hood release lever. Apply battery voltage across terminals No. 6 (positive) and No. 8 (negative) while checking voltage on terminals No. 1. See Fig 1 . Replace relay if battery voltage does not exist.
- Apply battery voltage across terminals No. 7 (positive) and No. 10 (negative) while checking continuity between terminals No. 3 and 4. Replace relay if continuity does not exist.
- Apply battery voltage across terminals No. 3 (positive) and No. 9 (negative) while checking voltage on terminal No. 4. Replace relay if battery voltage does not exist.
- Disconnect ECM connector. Turn ignition on. Using DVOM, measure voltage between ECM harness connector terminal No. 6 (10-pin connector) (terminal No. 22 on Calif. Elantra - 22-pin connector), and vehicle ground. If voltage is less than battery voltage, inspect and repair circuit as needed.
- Disconnect control relay harness connector. Using DVOM, measure voltage between control relay harness connector terminal No. 6 (White/Blue wire) and vehicle ground. If voltage is less than battery voltage, inspect and repair circuit as needed.
- Turn ignition off. Using ohmmeter, check resistance between control relay harness connector terminal No. 8 (Brown/Red wire) and ECM harness connector terminals No. 12 and 15 (18-pin connector), (terminal No. 1 on Calif. Elantra) See Figure and Figure . If continuity does not exist, inspect and repair circuits as needed.
- Using ohmmeter, check resistance between control relay harness connector terminal No. 1 (Red wire) and ECM harness connector terminals No. 4 and 9 (10-pin connector) (terminals No. 2 and 5 on Calif. Elantra) See Figure and Figure . If continuity does not exist, inspect and repair circuits as needed.
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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.