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 L4-1.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSMAIN RELAY (COMPUTER/FUEL SYSTEM)TESTING AND INSPECTION
1994 Hyundai Elantra L4-1.8L
Main Relay (Computer/Fuel System): Testing and Inspection
1994 Hyundai Elantra L4-1.8LSECTION Testing and Inspection
Circuit Diagram
Using scan Tool
Harness Inspection Procedure
Control Relay Inspection
NOTE: When applying battery voltage directly, make sure that it is applied to correct terminal. Otherwise, the relay could be damaged.
Fig. 1 Control Relay Test:
1. Connect a 12V power supply (+) terminal to the terminal 6 of the MFI control relay and measure the voltages at terminal 1 when the (-) terminal is connected to and disconnected from the terminal 8.
Fig. 2 Control Relay Testing:
2. Connect a 12V power supply (-) terminal to the terminal 10 of the control relay and check the continuity between terminals 3 and 4 when the (+) terminal is connected to and disconnected from the terminal 7.
3. Connect a 12V power supply (+) terminal to the terminal 3 of the MFI control relay and measure the voltages at the terminal 4 when the (-) terminal is connected to and disconnected from the terminal 9.
4. if one of the above is improper, replace the MFI control relay.
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.