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 MANUALSHYUNDAI1994EXCEL GL, AUTOMATIC, KM171REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - BASIC TESTINGFUEL SYSTEMMFI CONTROL RELAY TEST
1994 Hyundai Excel GL, Automatic, KM171
MFI Control Relay Test
1994 Hyundai Excel GL, Automatic, KM171SECTION MFI Control Relay Test
CAUTION:
When applying direct battery voltage, ensure voltage is applied to correct terminal; otherwise, relay damage could result.
- Remove control relay, located under left side of dashboard, near instrument panel. Using ohmmeter, check resistance between terminals No. 2 and 8 and terminals No. 3 and 8. See Fig 1 . Resistance should be approximately 95 ohms. Check resistance between terminals No. 6 and 7. Resistance should be approximately 35 ohms. Check continuity between relay terminals No. 5 and 7. There should be continuity in one direction only.
- Connect 12-volt battery across relay terminals No. 6 (positive) and No. 7 (negative). Continuity should exist between terminals No. 1and 4 until voltage is disconnected.
- Connect 12-volt battery across terminals No. 5 and 7, and check continuity between terminals No. 1 and 3. Continuity should exist between terminals No. 1 and 3 until voltage is disconnected. Replace control relay if it fails any test.
RENDER: 1.0x
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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.