A/T System Description - Power Flow
P Position
Hydraulic pressure is not applied to the clutches; power is not transmitted to the countershaft. The countershaft is locked by the park pawl interlocking the park gear on the countershaft.
N Position
Engine output transmitted from the mainshaft drives the mainshaft 4th gear, the third shaft 4th gear, the idler gear shaft idler gear, and the secondary shaft idler gear, but since hydraulic pressure is not applied to the clutches, output is not transmitted to the countershaft. In this position, the position of the reverse selector differs according to whether the shift lever shifted from D or R:
When shifted from D, the reverse selector engages with the third shaft 6th gear and the reverse selector hub, and the 6th gear engages with the third shaft.
When shifted from R, the reverse selector engages with the third shaft reverse gear and the reverse selector hub, and the reverse gear engages with the third shaft.
D Position, S Position with Automatic Shift Mode*1, and S Position*2
In D, the optimum gear is automatically selected from 1st, 2nd, 3rd, 4th, 5th, and 6th gears; and 1st, 2nd, 3rd, 4th, and 5th gears in S with automatic shift mode*1, ans S*2 according to conditions between the accelerator pedal command or position (engine loading) and the vehicle speed.

*1: Transmission with the paddle shifters
*2: Transmission without the paddle shifters
In 1st Gear
Hydraulic pressure is applied to the 1st clutch, then the 1st clutch engages the secondary shaft 1st gear with the secondary shaft.
Mainshaft rotation is transmitted to the mainshaft 4th gear splined with the mainshaft.
The mainshaft 4th gear drives the secondary shaft idler gear splined with the secondary shaft and the secondary shaft via the idler gear shaft idler gear.
The secondary shaft and the secondary shaft 1st gear engaged by the 1st clutch, and the secondary shaft 1st gear drives the countershaft 1st gear.
The countershaft 1st gear drives the park gear splined with the countershaft via the one-way clutch.
Power is transmitted from the countershaft to the final drive gear, which in turn drives the final driven gear.
In 2nd Gear
Hydraulic pressure is applied to the 2nd clutch, then the 2nd clutch engages the secondary shaft 2nd gear with the secondary shaft.
Mainshaft rotation is transmitted to the mainshaft 4th gear splined with the mainshaft.
The mainshaft 4th gear drives the secondary shaft idler gear splined to the secondary shaft and the secondary shaft via the idler gear shaft idler gear.
The secondary shaft and the secondary shaft 2nd gear engaged by the 2nd clutch, and the secondary shaft 2nd gear drives the countershaft 2nd gear splined with the countershaft.
Power is transmitted from the countershaft to the final drive gear, which in turn drives the final driven gear.
Hydraulic pressure is also applied to the 1st clutch, but since the rotation speed of the countershaft exceeds that of 1st gear, power output from 1st gear is cut off at the one-way clutch.
In 3rd Gear
Hydraulic pressure is applied to the 3rd clutch, then the 3rd clutch engages the mainshaft 3rd gear with the mainshaft.
Mainshaft rotation is transmitted from the mainshaft 3rd gear engaged with the 3rd clutch to the countershaft 2nd gear splined with the countershaft.
Power is transmitted from the countershaft to the final drive gear, which in turn drives the final driven gear.
Hydraulic pressure is also applied to the 1st clutch, but since the rotation speed of the countershaft exceeds that of 1st gear, power output from 1st gear is cut off at the one-way clutch.
In 4th Gear
Hydraulic pressure is applied to the D inhibitor valve to engage the reverse selector with the third shaft 6th gear while the shift lever is in the forward range (D and S).
Hydraulic pressure is applied to the 4th clutch, then the 4th clutch engages the third shaft 4th gear with the third shaft.
Mainshaft rotation is transmitted to the third shaft 4th gear via the mainshaft 4th gear splined with the mainshaft.
Rotation of the third shaft 4th gear is transmitted to the third shaft 6th gear from the reverse selector hub via the reverse selector.
The third shaft 6th gear drives the countershaft 5th gear splined with the countershaft and the countershaft via the mainshaft 6th gear.
Power is transmitted from the countershaft to the final drive gear, which in turn drives the final driven gear.
Hydraulic pressure is also applied to the 1st clutch, but since the rotation speed of the countershaft exceeds that of 1st gear, power output from 1st gear is cut off at the one-way clutch.
In 5th Gear
Hydraulic pressure is applied to the 5th clutch, then the 5th clutch engages the secondary shaft 5th gear with the secondary shaft.
Mainshaft rotation is transmitted to the mainshaft 4th gear splined with the mainshaft.
The mainshaft 4th gear drives the secondary shaft idler gear splined with the secondary shaft and the secondary shaft via the idler gear shaft idler gear.
The secondary shaft and the secondary shaft 5th gear engaged by the 5th clutch, and the secondary shaft 5th gear drives the countershaft 5th gear splined with the countershaft.
Power is transmitted from the countershaft to the final drive gear, which in turn drives the final driven gear.
Hydraulic pressure is also applied to the 1st clutch, but since the rotation speed of the countershaft exceeds that of 1st gear, power output from 1st gear is cut off at the one-way clutch.
In 6th Gear
Hydraulic pressure is applied to the 6th clutch, then the 6th clutch engages the mainshaft 6th gear with the mainshaft.
Mainshaft rotation is transmitted from the mainshaft 6th gear engaged with the 6th clutch to the countershaft 5th gear splined with the countershaft.
Power is transmitted from the countershaft to the final drive gear, which in turn drives the final driven gear.
Hydraulic pressure is also applied to the 1st clutch, but since the rotation speed of the countershaft exceeds that of 1st gear, power output from 1st gear is cut off at the one-way clutch.
R Position
Hydraulic pressure is applied to the D inhibitor valve to engage the reverse selector with the third shaft reverse gear while the shift lever is in R.
Hydraulic pressure is applied to the 4th clutch, then the 4th clutch engages the third shaft 4th gear with the third shaft.
Mainshaft rotation is transmitted to the third shaft 4th gear via the mainshaft 4th gear splined with the mainshaft.
Rotation of the third shaft 4th gear is transmitted from the reverse selector hub that rotates with the third shaft to the third shaft reverse gear, via the reverse selector.
The third shaft reverse gear drives the mainshaft 3rd gear via the reverse idler gear.
The mainshaft 3rd gear drives the countershaft 2nd gear splined with the countershaft.
The rotation direction of the countershaft is changed by the reverse idler gear.
Power is transmitted from the countershaft to the final drive gear, which in turn drives the final driven gear.