MFI Main Relay (Hyundai Elantra XD)

When the ignition is turned on, the battery voltage is supplied to the engine control unit, fuel injectors, air flow meter, etc., and voltage is also supplied to the winding of the main relay, which, by closing to ground, turns on the elements of the fuel system.

Examination

1. Check the conductivity between contacts 5 () and 1 (–) of the relay.

Relay winding (between contacts 5 and 1)	Conductivity
The winding is on	No
The winding is off	Yes

The original can be read on the resource hyundaibook



2. If the relay is faulty, replace it.

Relay winding (between contacts 5 and 3)	Conductivity
The winding is off	No
The winding is on	Yes