Acura CSX. Manual — part 243
01
SNR9AA1E10410800000CAAT04
Hydraulic Controls
Valve Bodies
14-53
SHIFT SOLENOID
VALVE D
SHIFT SOLENOID
VALVE E
SHIFT SOLENOID
VALVE C
SHIFT SOLENOID
VALVE A
SHIFT SOLENOID
VALVE B
A/T CLUTCH PRESSURE
CONTROL SOLENOID
VALVE B
A/T CLUTCH PRESSURE
CONTROL SOLENOID
VALVE C
A/T CLUTCH PRESSURE
CONTROL SOLENOID
VALVE A
SERVO BODY
REGULATOR
VALVE BODY
MAIN VALVE BODY
The valve body includes the main valve body, the regulator valve body, and the servo body. The ATF pump is driven
by splines on the end of the torque converter which is attached to the engine. Fluid flows through the regulator valve
to maintain specified pressure through the main valve body to the manual valve, directing pressure to the shift valves
and to each of the clutches via the shift solenoid valves. Shift solenoid valves A, B, C, D, and E are bolted on the servo
body. A/T clutch pressure control solenoid valves A, B, and C are mounted on the outside of the transmission housing.
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*15
*16
Main Valve Body
Regulator Valve Body
14-54
Automatic Transmission
MAIN VALVE BODY
SHIFT VALVE C
COOLER CHECK VALVE
LOCK-UP CONTROL VALVE
SHIFT VALVE E
SERVO CONTROL VALVE
RELIEF VALVE
MANUAL VALVE
SHIFT VALVE B
SHIFT VALVE A
ATF PUMP DRIVEN GEAR
ATF PUMP DRIVE GEAR
TORQUE CONVERTER
CHECK VALVE
LOCK-UP SHIFT VALVE
REGULATOR VALVE BODY
3RD ACCUMULATOR
1ST ACCUMULATOR
REGULATOR VALVE
The main valve body contains the manual valve, shift valves A, B, C, and E, the relief valve, the lock-up control valve,
the cooler check valve, the servo control valve, the ATF pump drive gear, and the ATF pump driven gear. The primary
function of the main valve body is to switch fluid pressure on and off and to control hydraulic pressure going to the
hydraulic control system.
The regulator valve body contains the regulator valve, the torque converter check valve, the lock-up shift valve, and
the 1st and 3rd accumulators.
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01
*17
Regulator Valve
14-55
To TORQUE
CONVERTER
From ATF PUMP
To LUBRICATION and
To RELIEF VALVE
C
B
A
REGULATOR VALVE
ORIFICE
VALVE SPRING
STATOR
TORQUE CONVERTER
REGULATOR VALVE
REGULATOR
SPRING CAP
STATOR SHAFT
ARM END
STATOR SHAFT
REGULATOR VALVE BODY
The regulator valve maintains constant hydraulic pressure from the ATF pump to the hydraulic control system, while
also providing fluid to the lubrication system and the torque converter. The fluid from the ATF pump flows through B
and C. Fluid entering from B flows through the valve orifice to the A cavity. This pressure in the A cavity pushes the
regulator valve toward the valve spring side, and this movement of the regulator valve uncovers the fluid port to the
torque converter and the relief valve. The fluid flows out to the torque converter and the relief valve, and the regulator
valve returns under spring force. According to the level of the hydraulic pressure through B, the position of the
regulator valve changes, and the amount of fluid from C through torque converter also changes. This operation is
continuous, maintaining the line pressure.
Increases in hydraulic pressure according to torque are regulated by the regulator valve using stator torque reaction.
The stator shaft is splined with the stator in the torque converter, and the stator shaft arm end contacts the regulator
spring cap. When the vehicle is accelerating or climbing (torque converter range), stator torque reaction acts on the
stator shaft, and the stator shaft arm end pushes the regulator spring cap in the direction of the arrow in proportion to
the reaction. The stator reaction spring compresses, and the regulator valve moves to increase the line pressure which
is regulated by the regulator valve. The line pressure reaches its maximum when the stator torque reaction reaches its
maximum.
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06
07
Servo Body
Accumulator
14-56
Automatic Transmission
SHIFT SOLENOID
VALVE A
SHIFT SOLENOID
VALVE B
SHIFT SOLENOID
VALVE C
SHIFT SOLENOID
VALVE D
SHIFT SOLENOID
VALVE E
SERVO BODY
SERVO VALVE
SHIFT VALVE D
SERVO BODY
REGULATOR
VALVE BODY
5TH ACCUMULATOR
3RD ACCUMULATOR
1ST ACCUMULATOR
2ND ACCUMULATOR
4TH ACCUMULATOR
The servo body contains the servo valve, shift valve D, the accumulators for 2nd, 4th, and 5th, and shift solenoid
valves A, B, C, D, and E.
The accumulators are located in the regulator valve body and the servo body. The regulator valve body contains the
1st and 3rd accumulators, and the servo body contains the 2nd, 4th, and 5th accumulators.
08/08/21 14:38:29 61SNR030_140_0058
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