Note: When the ignition coil lock (1) is pressed, the electrical harness connector is disconnected.
Press the ignition coil lock (1) (in area "a") (as shown by the arrow).
Disconnect the electrical harness connector (in area "b") (as shown by the arrow).
Remove the ignition coils (up).
Remove the spark plugs.
Install spark plugs (tightening torque 23 Nm).
Install the electrical harness connector and lower the ignition coil retainer to connect the electrical harness connector.