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.

Fig 1: Identifying MFI Control Relay Component Connectors

Courtesy of HYUNDAI MOTOR CO.

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.

Safety Warning

MFI Control Relay Test