Disconnect control relay connector. Using an ohmmeter, check continuity between relay terminals No. 1 and 4. See Fig 1 . If no continuity is present, go to next step. If continuity is present, control relay is defective. Replace control relay.
Check resistance between terminals No. 3 and 8, and terminals No. 2 and 8. Approximately 95 ohms resistance should be present. If resistance is not within specification, replace control relay.
Check resistance between terminals No. 6 and 7. Approximately 35 ohms resistance should be present.
Check continuity between terminals No. 5 and 7, then reverse leads. Continuity should exist in one direction only. If continuity exists in both or neither direction, control relay is defective.
Apply battery voltage across terminals No. 6 (positive) and No. 7 (negative), while checking continuity between terminals No. 1 and 4. If continuity is present, control relay is okay. If continuity does not exist, replace control relay.
Apply battery voltage across terminals No. 5 (positive) and No. 7 (negative), while checking continuity between terminals No. 1 and 2. If continuity is present, relay is okay. If continuity is not present, replace control relay.

Fig 1: Identifying Control Relay Terminals (1.5L & 2.4L)

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

Control Relay (1.5L & 2.4L)