Acura CSX. Manual - part 244
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Hydraulic Flow
Distribution of Hydraulic Pressure
Hydraulic Pressure at the Port for use in the hydraulic circuit
Port
No.
Hydraulic Pressure
Port
No.
Hydraulic Pressure
14-57
As the engine turns, the ATF pump starts to operate. Automatic transmission fluid (ATF) is drawn through the ATF
strainer (filter) and discharged into the hydraulic circuit. Then, ATF flowing from the ATF pump becomes line pressure
that is regulated by the regulator valve. Torque converter pressure from the regulator valve enters the torque
converter through the lock-up shift valve, and it is discharged from the torque converter. The torque converter check
valve prevents torque converter pressure from rising.
The PCM switches shift solenoid valves ON and OFF. The shift solenoid valve intercepts line pressure from the ATF
pump via the manual valve when the shift solenoid valve is OFF. When the shift solenoid valve is turned ON by the
PCM, line pressure changes to shift solenoid valve pressure at the shift solenoid valve, then the shift solenoid valve
pressure flows to the shift valve. Applying shift solenoid pressure to the shift valves moves the position of the shift
valve, and switches the port of the hydraulic circuit. The PCM also controls A/T clutch pressure control solenoid valves
A, B, and C. The A/T clutch pressure control solenoid valves regulate hydraulic pressure, and applies pressure to the
clutches to engage smoothly. The clutches receive optimum clutch pressure which is regulated by the A/T clutch
pressure control solenoid valves for comfortable driving and shifting under all conditions.
1
Line
SB
Shift solenoid valve B
3
Line
SC
Shift solenoid valve C
3’
Line
SD
Shift solenoid valve D
4
Line
SE
Shift solenoid valve E
4’
Line
10
1st clutch
4’’
Line
20
2nd clutch
7
Line
30
3rd clutch
1A
40
4th clutch
1B
50
5th clutch
3A
55
A/T clutch pressure control solenoid valve A
3B
55’
A/T clutch pressure control solenoid valve A
3C
56
A/T clutch pressure control solenoid valve B
5A
57
A/T clutch pressure control solenoid valve C
5B
90
Torque converter
5C
91
Torque converter
5D
92
Torque converter
5E
93
ATF cooler
5F
94
Torque converter
5G
A/T clutch pressure control solenoid valve B
95
Lubrication
5H
A/T clutch pressure control solenoid valve C
96
Torque converter
5J
A/T clutch pressure control solenoid valve C
97
Torque converter
5K
A/T clutch pressure control solenoid valve C
99
Suction
5L
A/T clutch pressure control solenoid valve C
X
Drain
5N
A/T clutch pressure control solenoid valve C
HX
High position drain
SA
Shift solenoid valve A
AX
Air drain
Line or A/T clutch pressure control solenoid valve A
Line or A/T clutch pressure control solenoid valve A
Line or A/T clutch pressure control solenoid valve A
Line or A/T clutch pressure control solenoid valve A
Line or A/T clutch pressure control solenoid valve A
Line or A/T clutch pressure control solenoid valve A
Line or A/T clutch pressure control solenoid valve A
Line or A/T clutch pressure control solenoid valve A
Line or A/T clutch pressure control solenoid valve A
Line or A/T clutch pressure control solenoid valve B
Line or A/T clutch pressure control solenoid valve A or
B
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