WITHOUT i-ELOOP

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5] .)
Insert a tape-wrapped flathead screwdriver into the service hole in the position shown in the figure.

Fig 1: Identifying Main Fuse Cover Service Hole
Courtesy of MAZDA MOTORS CORP.
Move the flathead screwdriver in the direction of the arrow (1) shown in the figure, and pull up the main fuse cover in the direction of the arrow (2) shown in the figure to detach the main fuse cover tab from the main fuse.

Fig 2: Pulling Out Main Fuse Cover Using Flathead Screwdriver
Courtesy of MAZDA MOTORS CORP.
Remove the main fuse cover.
Remove the nuts.

Fig 3: Identifying Engine And Front Wiring Harness Nuts With Torque Specifications
Courtesy of MAZDA MOTORS CORP.
Remove the main fuse.
Install in the reverse order of removal.