Acura TSX / Honda Accord CL. Manual — part 934

Fig. 50: Identifying Main Valve Body Components

Regulator Valve Body

The regulator valve body contains the regulator valve, the torque converter check valve, lock-up shift valve, and
the 1st and 3rd accumulators.

Fig. 51: Identifying Regulator Valve Body Components

Regulator Valve

The regulator Valve maintains a constant hydraulic pressure from the ATF pump to the hydraulic control
system, while also furnishing fluid to the lubrication system and torque converter. The fluid from the ATF

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

pump flows through B and C. Fluid entering from B flows through the valve orifice to the A cavity. This
pressure of the A cavity pushes the regulator valve to the right 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 moves to the left side. 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 continued, maintaining the line pressure.

Fig. 52: Identifying Regulator Valve

NOTE:

When used, "left" or "right" indicates direction on the illustration below.

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 53: Regulator Valve Operation

Increases in hydraulic pressure according to torque are performed by the regulator valve using stator torque
reaction. The stator shaft is splined with the stator in the torque converter, and its 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 arm 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.

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 54: Locating Regulator Valve

Servo Body

The servo body contains the servo valve, the shift valve D, accumulators for 2nd, 4th, and 5th, and shift
solenoid valves for A, B, C, D, and E.

Fig. 55: Identifying Servo Body Components

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed