Honda Civic. Manual — part 180

Fig. 46: Hydraulic Fuel Pressure Flow Diagram (D Position - Driving In 3rd
Gear)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

D Position: Shifting between 3rd gear and 4th gear

As the speed of the vehicle reaches the programmed value, the PCM turns shift
solenoid valve A ON. Shift solenoid valve B remains OFF, and C remains ON.
Shift solenoid valve A pressure (SA) is applied to the right end of shift valve A and
the left end of cut valve A. Shift valve A is moved to the left side, switching the line
pressure (5L) port to the A/T clutch pressure control solenoid valve C pressure (5K)
port leading to the 3rd clutch. Also shift valve A uncovers the 4th clutch pressure
(40) port leading A/T clutch pressure control solenoid valve B pressure (5H) to the
4th clutch. The 3rd and 4th clutches are engaged by the A/T clutch pressure control
solenoid valve pressure mode.

NOTE:

When used, "left" or "right" indicates direction on the
hydraulic circuit.

2008 Honda Civic LX

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

Fig. 47: Hydraulic Fuel Pressure Flow Diagram (D Position - Shifting Between
3rd Gear And 4th Gear)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

D Position: Driving in 4th gear

The PCM turns shift solenoid valve B ON, and shift solenoid valve A and B remain
ON. Shift solenoid valve B pressure (SB) is applied to the right side of shift valve B
and the left side of the servo control valve. Shift valve B then moves to the left side
releasing the 3rd clutch pressure. The 4th clutch is engaged by the A/T clutch
pressure control solenoid valve B pressure mode.

NOTE:

When used, "left" or "right" indicates direction on the
hydraulic circuit.

NOTE:

When used, "left" or "right" indicates direction on the
hydraulic circuit.

2008 Honda Civic LX

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

Fig. 48: Hydraulic Fuel Pressure Flow Diagram (D Position - Driving In 4th
Gear)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

D Position: Shifting between 4th gear and 5th gear

As the speed of the vehicle reaches the programmed value, the PCM turns shift
solenoid valve A OFF while shift solenoid valve B and C remain ON. As a result,
the pressure in the right end of shift valve A is released. Even though shift solenoid
valve A pressure (SA) is released, cut valve A is kept on the right side by the line
pressure (4). Shift valve A is moved to the right side to uncover A/T clutch pressure
control solenoid valve C pressure (5T) (5J) port leading to the 4th clutch. The 4th
and 5th clutches are engaged by the A/T clutch pressure control solenoid valve
pressure mode.

NOTE:

When used, "left" or "right" indicates direction on the
hydraulic circuit.

2008 Honda Civic LX

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

Fig. 49: Hydraulic Fuel Pressure Flow Diagram (D Position - Shifting Between
4th Gear And 5th Gear)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

D Position: Driving in 5th gear

The PCM turns shift solenoid valve C OFF, shift solenoid valve A remains OFF,
and B remains ON. Shift solenoid valve C pressure (SC) is then released to the right
side of shift valve C. This causes shift valve C to move to the right side, releasing
the 4th clutch pressure. The 5th clutch is engaged by the A/T clutch pressure control
solenoid valve C pressure mode.

NOTE:

When used, "left" or "right" indicates direction on the
hydraulic circuit.

2008 Honda Civic LX

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