Main Relay (Computer/Fuel System): Testing and Inspection

MULTIPORT FUEL INJECTION (MFI) RELAY AND FUEL PUMP RELAY CHECK
1. Remove the relay.




2. Check the continuity between the MFI relay terminals.
3. Use the jumper leads to connect relay terminal 4 to the battery (+) terminal and terminal 2 to the battery (-) terminal.




4. Check the continuity between relay terminals 1 - 3 while connecting and disconnecting the jumper lead at the battery (-) terminal.
5. If there is a defect, replace the MFI relay or fuel pump relay.