Acura RL. Manual - part 225

Fig. 36: Identifying Main Valve Body Components (05 Model) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Main Valve Body ('06-08 Models) 

The main valve body contains the manual valve, the modulator valve, the shift valve A, the shift valve B, the 
shift valve E, the CPC valve A, the servo control valve, the lubrication check valve, the lubrication control 
valve, the torque converter check valve, the lock-up timing valve, the relief valve, the lock-up shift valve, and 
the ATF pump gears. The primary function of the main valve body is to switch fluid pressure on and off to 
control hydraulic pressure going to the hydraulic control system. 

Fig. 37: Identifying Main Valve Body Components (06-08 Models) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Regulator Valve Body ('05 Model) 

The regulator valve body is located on the main valve body. The regulator valve body contains the regulator 
valve, the lock-up control valve, the servo valve, and the 3rd accumulator.

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

me 

 

Friday, June 05, 2009 1:18:11 PM

Page 71 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 38: Identifying Regulator Valve Body Components (05 Model) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Regulator Valve Body ('06-08 Models) 

The regulator valve body is located on the main valve body. The regulator valve body contains the regulator 
valve, the cooler check valve, the lock-up control valve, the servo valve, and the 3rd accumulator. 

Fig. 39: Identifying Regulator Valve Body Components (06-08 Models) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Regulator Valve 

The regulator valve maintains constant hydraulic pressure from the ATF pump to the hydraulic control system, 
while also furnishing fluid to the lubricating system and torque converter. Fluid from the ATF pump flows 
through B and B'. Fluid entering from B flows through the valve orifice to the A cavity. This pressure of the A 

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

me 

 

Friday, June 05, 2009 1:18:11 PM

Page 72 

© 2005 Mitchell Repair Information Company, LLC. 

cavity pushes the regulator valve to the 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 B' through the torque converter 
changes. This operation is continued, maintaining the line pressure. 

Fig. 40: Checking Regulator Valve 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Increases in hydraulic pressure according to torque are regulated by the regulator valve using stator torque 
reaction. The stator shaft is splined to 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. 

Fig. 41: Identifying Regulator Spring Cap Pushing Direction 
Courtesy of AMERICAN HONDA MOTOR CO., INC.

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

me 

 

Friday, June 05, 2009 1:18:11 PM

Page 73 

© 2005 Mitchell Repair Information Company, LLC. 

Secondary Valve Body 

The secondary valve body is on the main valve body. The secondary valve body contains the shift valve C, the 
shift valve D, the CPC valve B, the CPC valve C, the reverse control valve, and the reverse CPC valve. 

Fig. 42: Identifying Secondary Valve Body Components 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Accumulator Body 

The accumulator body is on the secondary valve body, and contains the 1st, 1st-hold, 2nd, 4th, and 5th 
accumulators. The 3rd accumulator is in the regulator valve body. 

Fig. 43: Identifying Accumulator Body Components 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Hydraulic Flow 

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

me 

 

Friday, June 05, 2009 1:18:11 PM

Page 74 

© 2005 Mitchell Repair Information Company, LLC.