Acura CSX. Manual — part 247
*12
R Position: Shifting to R position from P or N position
14-69
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: OFF
D: OFF
E: ON
A
B
C
IDLER
SHAFT
COUNTER-
SHAFT
SECONDARY
SHAFT
MAINSHAFT
IDLER GEAR
FINAL DRIVE
GEAR
When shifting to R, the PCM turns shift solenoid valves B and E ON, and A, C, and D are turned OFF. Shift solenoid
valve B pressure (SB) is applied to the right side of shift valve B, and shift valve B is moved to the left side. Shift
solenoid valve E pressure (SE) is applied to the left side of shift valve E, and shift valve E is moved to the right side.
Line pressure (1) changes to (3) at the manual valve, and flows to the servo valve via shift valve E. The servo valve is
moved to the reverse range position. Movement of shift valves B and E, and the servo valve creates 4th clutch
pressure line between the 4th clutch and A/T clutch pressure control solenoid valve A. 4th clutch pressure (40) is
applied to the 4th clutch, and the 4th clutch is engaged gently.
NOTE: When used, ‘‘left’’ or ‘‘right’’ indicates direction on the hydraulic circuit.
08/08/21 14:39:38 61SNR030_140_0071
*13
R Position: Driving in reverse gear
Reverse Inhibitor Control
14-70
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: OFF
D: OFF
E: ON
A
B
C
IDLER
SHAFT
COUNTER-
SHAFT
SECONDARY
SHAFT
MAINSHAFT
IDLER GEAR
FINAL DRIVE
GEAR
After starting off in reverse gear, the PCM turns shift solenoid valve A ON, B and E remain ON, and C and D remain
OFF. Shift solenoid valve A pressure (SA) is applied to the right side of shift valve A to cover the A/T clutch pressure
control solenoid valve A pressure port, and to uncover the line pressure port leading to the 4th clutch creating full line
pressure. The 4th clutch is engaged securely with line pressure.
When R is selected while the vehicle is moving forward, the PCM commands shift solenoid valve A to turn OFF, and E
to remain OFF. Shift solenoid valve A pressure (SA) is not applied to shift valve A so that line pressure (3A) is not
applied to the servo valve. Also shift solenoid valve E pressure (SE) is not applied to shift valve E so that line pressure
(3’) is not applied to the servo valve. The servo valve cannot be shifted to the reverse position, and hydraulic pressure
is not applied to the 4th clutch from the servo valve for reverse; as a result, power is not transmitted to the reverse
direction.
NOTE: When used, ‘‘left’’ or ‘‘right’’ indicates direction on the hydraulic circuit.
08/08/21 14:39:39 61SNR030_140_0072
*14
P Position
14-71
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: OFF
D: OFF
E: ON
A
B
C
IDLER
SHAFT
COUNTER-
SHAFT
SECONDARY
SHAFT
MAINSHAFT
IDLER GEAR
FINAL DRIVE
GEAR
The PCM turns shift solenoid valves B and E ON, and A, C, and D OFF. Line pressure (1) flows to the shift solenoid
valves and A/T clutch pressure control solenoid valve A. Line pressure (3) changes to (3’) at shift valve E, and flows to
the servo valve. The servo valve is moved to the reverse/park position. Hydraulic pressure is not applied to the
clutches.
08/08/21 14:39:41 61SNR030_140_0073
01
02
SNR9AA1E10474000000CAAT06
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
Lock-up System
Torque Converter Clutch Lock-up ON (Engaging Torque Converter Clutch)
Torque Converter Clutch Lock-up OFF (Disengaging Torque Converter Clutch)
14-72
Automatic Transmission
Power flow
The power flows by way of:
Engine
Drive plate
Torque converter cover
Torque converter clutch piston
Damper spring
Turbine
Mainshaft
To ATF cooler
INLET
OUTLET
DAMPER SPRING
TURBINE
MAINSHAFT
TORQUE CONVERTER
CLUTCH PISTON
TORQUE
CONVERTER
COVER
To ATF cooler
INLET
TURBINE
PUMP
TORQUE
CONVERTER
COVER
MAINSHAFT
Power flow
The power flows by way of:
Engine
Drive plate
Torque converter cover
Pump
Turbine
Mainshaft
The lock-up mechanism of the torque converter clutch operates in D and S (2nd, 3rd, 4th, and 5th gears). The
pressurized fluid is drained from the back of the torque converter through a fluid passage, causing the torque
converter clutch piston to be held against the torque converter cover. As this takes place, the mainshaft rotates at the
same speed as the engine. Together with the hydraulic control, the PCM optimizes the timing and volume of the lock-
up mechanism. When shift solenoid valve E is turned on by the PCM, shift solenoid valve E pressure switches the lock-
up shift valve on. A/T clutch pressure control solenoid valve A and the lock-up control valve control the degree of lock-
up.
Fluid in the chamber between the torque converter cover and the torque converter clutch piston is drained off, and
fluid entering from the chamber between the pump and the stator exerts pressure through the torque converter clutch
piston against the torque converter cover. The torque converter clutch piston engages with the torque converter cover;
the torque converter clutch lock-up is ON, and the mainshaft rotates at the same speed as the engine.
Fluid entered from the chamber between the torque converter cover and the torque converter clutch piston passes
through the torque converter and goes out through the chambers between the turbine and the stator, and between the
pump and the stator. As a result, the torque converter clutch piston moves away from the torque converter cover, and
the torque converter lock-up clutch is released; the torque converter clutch lock-up is OFF.
08/08/21 14:39:41 61SNR030_140_0074
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