Acura CSX. Manual — part 244
SNR9AA1E10410800000CAAT05
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
08/08/21 14:38:29 61SNR030_140_0059
*01
N Position
14-58
Automatic Transmission
TORQUE
CONVERTER
2ND
ACCUMU-
LATOR
2ND
CLUTCH
3RD
CLUTCH
4TH
CLUTCH
5TH
CLUTCH
4TH
ACCUMULATOR
TORQUE
CONVERTER
CHECK
VALVE
SHIFT
SOLENOID
VALVES
SHIFT
VALVE D
SHIFT
VALVE A
LOCK-UP
SHIFT
VALVE
LOCK-UP
CONTROL
VALVE
RELIEF VALVE
COOLER
CHECK
VALVE
ATF
COOLER
REGULATOR
VALVE
SERVO VALVE
SERVO
CONTROL
VALVE
MANUAL VALVE
ATF PUMP
3RD CLUTCH
TRANSMISSION FLUID
PRESSURE SWITCH
1ST
CLUTCH
A/T CLUTCH
PRESSURE CONTROL
SOLENOID VALVES
3RD
ACCUMULATOR
1ST
ACCUMULATOR
5TH
ACCUMULATOR
2ND CLUTCH
TRANSMISSION FLUID
PRESSURE SWITCH
SHIFT
VALVE
C
SHIFT
VALVE
B
SHIFT
VALVE E
20
30
50
SB
1
SA
5B
5A
SC
5K
5B
5C
4
4
3B
4
5A
5F
SB
55
1
90
94
SE
94
91
96
93
7
55
90
95
90
93
93
99
1
92
1
95
HX
1B
3
3’
4
5G
91
X
X
X
X
X
X
10
97
93
X
95
56
40
50
10
55’
90
96
X
7
AX
AX
HX
4’’
3A
3A
7
1A
3
3’
3C
5N
5E
3C
5L
5J
SA
40
X
5F
5H
10
1
55
1
56
4’’
57
4
95
30
30
95
10
40
20
57
X X
X X
5H
5G
5E
5C
X
X
92
X 5N
55’
50 30
1A
5K
92
4’
X
5J
5L
55’
1
57
SD
X
X
SE
X
X
3
X
57
SE
1
20
X X
1B
20
X
X
3A
X
X
X
X
X
SC
SD
AX
3B
X
4’
X
X
AX
X
X
AX
X
X
IDLER
SHAFT
COUNTER-
SHAFT
SECONDARY
SHAFT
MAINSHAFT
IDLER GEAR
FINAL DRIVE
GEAR
A: OFF
B: ON
C: ON
D: OFF
E: OFF
A
B
C
The PCM controls the shift solenoid valves. The conditions of the shift solenoid valves and positions of the shift valves
are as follows:
• Shift solenoid valve A: OFF, and shift valve A remains on the right side
• Shift solenoid valve B: ON, and shift valve B moves to the left side
• Shift solenoid valve C: ON, and shift valve C moves to the left side
• Shift solenoid valve D: OFF, and shift valve D remains on the left side
• Shift solenoid valve E: OFF, and shift valve E remains on the left side
Line pressure (1) flows to the shift solenoid valves and A/T clutch pressure control solenoid valve A. Under this
condition, hydraulic pressure is not applied to the clutches.
NOTE: When used, ‘‘left’’ or ‘‘right’’ indicates direction on the hydraulic circuit.
08/08/21 14:38:31 61SNR030_140_0060
*02
1st gear shifting from N position
14-59
TORQUE
CONVERTER
2ND
ACCUMU-
LATOR
2ND
CLUTCH
3RD
CLUTCH
4TH
CLUTCH
5TH
CLUTCH
4TH
ACCUMULATOR
TORQUE
CONVERTER
CHECK
VALVE
SHIFT
SOLENOID
VALVES
SHIFT
VALVE D
SHIFT
VALVE A
LOCK-UP
SHIFT
VALVE
LOCK-UP
CONTROL
VALVE
RELIEF VALVE
COOLER
CHECK
VALVE
ATF
COOLER
REGULATOR
VALVE
SERVO VALVE
SERVO
CONTROL
VALVE
MANUAL VALVE
ATF PUMP
3RD CLUTCH
TRANSMISSION FLUID
PRESSURE SWITCH
1ST
CLUTCH
A/T CLUTCH
PRESSURE CONTROL
SOLENOID VALVES
3RD
ACCUMULATOR
1ST
ACCUMULATOR
5TH
ACCUMULATOR
2ND CLUTCH
TRANSMISSION FLUID
PRESSURE SWITCH
SHIFT
VALVE
C
SHIFT
VALVE
B
SHIFT
VALVE E
20
30
50
SB
1
SA
5B
5A
SC
5K
5B
5C
4
4
3B
4
5A
5F
SB
55
1
90
94
SE
94
91
96
93
7
55
90
95
90
93
93
99
1
92
1
95
HX
1B
3
3’
4
5G
91
X
X
X
X
X
X
10
97
93
X
95
56
40
50
10
55’
90
96
X
7
AX
AX
HX
4’’
3A
3A
7
1A
3
3’
3C
5N
5E
3C
5L
5J
SA
40
X
5F
5H
10
1
55
1
56
4’’
57
4
95
30
30
95
10
40
20
57
X X
X X
5H
5G
5E
5C
X
X
92
X 5N
55’
50 30
1A
5K
92
4’
X
5J
5L
55’
1
57
SD
X
X
SE
X
X
3
X
57
SE
1
20
X X
1B
20
X
X
3A
X
X
X
X
X
SC
SD
AX
3B
X
4’
X
X
AX
X
X
AX
X
X
A: OFF
B: ON
C: ON
D: OFF
E: OFF
A
B
C
IDLER
SHAFT
COUNTER-
SHAFT
SECONDARY
SHAFT
MAINSHAFT
IDLER GEAR
FINAL DRIVE
GEAR
The shift solenoid valves remain the same as in N when shifting to D from N. The manual valve is moved to the D
position, and uncovers line pressure port (4) leading to A/T clutch pressure control solenoid valve C. Hydraulic
pressure to the 1st clutch from A/T clutch pressure control solenoid valve A is created as shift solenoid valve A OFF,
and B and C remain ON. A/T clutch pressure control solenoid valve A pressure (55) changes to 1st clutch pressure (10)
at shift valve B, and flows to the 1st clutch. The 1st clutch is engaged gently when shifting to D from N.
NOTE: When used, ‘‘left’’ or ‘‘right’’ indicates direction on the hydraulic circuit.
08/08/21 14:39:21 61SNR030_140_0061
→
−
→
−
→
−
→
−
→
−
→
*03
Driving in 1st gear in D and S with automatic shift mode
14-60
Automatic Transmission
TORQUE
CONVERTER
2ND
ACCUMU-
LATOR
2ND
CLUTCH
3RD
CLUTCH
4TH
CLUTCH
5TH
CLUTCH
4TH
ACCUMULATOR
TORQUE
CONVERTER
CHECK
VALVE
SHIFT
SOLENOID
VALVES
SHIFT
VALVE D
SHIFT
VALVE A
LOCK-UP
SHIFT
VALVE
LOCK-UP
CONTROL
VALVE
RELIEF VALVE
COOLER
CHECK
VALVE
ATF
COOLER
REGULATOR
VALVE
SERVO VALVE
SERVO
CONTROL
VALVE
MANUAL VALVE
ATF PUMP
3RD CLUTCH
TRANSMISSION FLUID
PRESSURE SWITCH
1ST
CLUTCH
A/T CLUTCH
PRESSURE CONTROL
SOLENOID VALVES
3RD
ACCUMULATOR
1ST
ACCUMULATOR
5TH
ACCUMULATOR
2ND CLUTCH
TRANSMISSION FLUID
PRESSURE SWITCH
SHIFT
VALVE
C
SHIFT
VALVE
B
SHIFT
VALVE E
20
30
50
SB
1
SA
5B
5A
SC
5K
5B
5C
4
4
3B
4
5A
5F
SB
55
1
90
94
SE
94
91
96
93
7
55
90
95
90
93
93
99
1
92
1
95
HX
1B
3
3’
4
5G
91
X
X
X
X
X
X
10
97
93
X
95
56
40
50
10
55’
90
96
X
7
AX
AX
HX
4’’
3A
3A
7
1A
3
3’
3C
5N
5E
3C
5L
5J
SA
40
X
5F
5H
10
1
55
1
56
4’’
57
4
95
30
30
95
10
40
20
57
X X
X X
5H
5G
5E
5C
X
X
92
X 5N
55’
50 30
1A
5K
92
4’
X
5J
5L
55’
1
57
SD
X
X
SE
X
X
3
X
57
SE
1
20
X X
1B
20
X
X
3A
X
X
X
X
X
SC
SD
AX
3B
X
4’
X
X
AX
X
X
AX
X
X
A: ON
B: ON
C: ON
D: OFF
E: OFF
A
B
C
IDLER
SHAFT
COUNTER-
SHAFT
SECONDARY
SHAFT
MAINSHAFT
IDLER GEAR
FINAL DRIVE
GEAR
The PCM turns shift solenoid valve A ON, B and C remain ON, and D and E remain OFF. Shift solenoid valve A
pressure (SA) is applied to the right side of shift valve A. Shift valve A is moved to the left side to uncover the line
pressure port leading to the 1st clutch, and to cover the A/T clutch pressure control solenoid valve pressure port.
Fluid flows to the 1st clutch by way of:
Line pressure (1)
Shift valve D
Line pressure (1A)
Shift valve A
Line pressure (1B)
Manual valve
Line
pressure (5A)
Shift valve C
Line pressure (5B)
Shift valve B
1st clutch pressure (10)
1st clutch
The 1st clutch pressure (10) is applied to the 1st clutch, and the 1st clutch is engaged securely.
NOTE: When used, ‘‘left’’ or ‘‘right’’ indicates direction on the hydraulic circuit.
08/08/21 14:39:22 61SNR030_140_0062
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