2nd Gear

Hydraulic pressure is applied to the 2nd clutch, then the 2nd clutch engages the secondary shaft 2nd gear with the secondary shaft.
The mainshaft idler gear drives the secondary shaft via the idler shaft idler gear and the secondary shaft idler gear.
The secondary shaft 2nd gear drives the countershaft 2nd gear and the countershaft.
Power is transmitted to the final drive gear, which in turn drives the final driven gear.

Fig 1: 2nd Gear Power Flow Diagram
Courtesy of AMERICAN HONDA MOTOR CO., INC.