Honda Civic. Manual — part 171

Power is transmitted to the final drive gear, which in turn drives the final
driven gear.

Fig. 21: Automatic Transmission - Power Flow Diagram - 3rd Gear
Courtesy of AMERICAN HONDA MOTOR CO., INC.

In 4th Gear

Hydraulic pressure is applied to the 4th clutch, then the 4th clutch engages the
secondary shaft 4th gear with the secondary shaft.

The mainshaft idler gear drives the secondary shaft via the idler gear shaft idler
gear and the secondary shaft idler gear.

The secondary shaft 4th gear drives the countershaft 4th-5th gear.

The countershaft 4th-5th gear drives the countershaft via the reverse selector,

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

which drives the reverse selector hub.

Power is transmitted to the final drive gear, which in turn drives the final
driven gear.

Fig. 22: Automatic Transmission - Power Flow Diagram - 4th Gear
Courtesy of AMERICAN HONDA MOTOR CO., INC.

In 5th Gear

Hydraulic pressure is applied to the servo valve to engage the reverse selector
with the countershaft 4th-5th gear and the reverse selector hub while the shift
lever is in forward range; D, D3, 2, and 1.

Hydraulic pressure is also applied to the 5th clutch, then the 5th clutch engages
the mainshaft 5th gear with the mainshaft.

The mainshaft 5th gear drives the countershaft 4th-5th gear.

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

The countershaft 4th-5th gear drives the countershaft via the reverse selector,
which drives the reverse selector hub.

Power is transmitted to the final drive gear, which in turn drives the final
driven gear.

Fig. 23: Automatic Transmission - Power Flow Diagram - 5th Gear
Courtesy of AMERICAN HONDA MOTOR CO., INC.

R Position

Hydraulic pressure is applied to the servo valve to engage the reverse selector
with the countershaft reverse gear and the reverse selector hub while the shift
lever is in R.

Hydraulic pressure is also applied to the 5th clutch, then the 5th clutch engages

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

the mainshaft reverse gear with the mainshaft.

The mainshaft reverse gear drives the countershaft reverse gear via the reverse
idler gear.

The rotational direction of the countershaft reverse gear is changed by the
reverse idler gear.

The countershaft reverse gear drives the countershaft via the reverse selector,
which drives the reverse selector hub.

Power is transmitted to the final drive gear, which in turn drives the final
driven gear.

Fig. 24: Automatic Transmission - Power Flow Diagram - R Position
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Electronic Control System

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)