Acura RL. Manual - part 220

Fig. 22: Power Flow Diagram - Deceleration In 1st Gear In M (Sequential Sportshift Mode)
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

R Position 



Hydraulic pressure is applied to the servo valve to engage the reverse selector with the countershaft 
reverse gear when the shift lever is in R.  



Hydraulic pressure is also applied to the 5th clutch, then the 5th clutch engages the mainshaft reverse gear 
with the mainshaft.  



The mainshaft reverse gear drives the countershaft reverse gear via the reverse idler gear.  



The countershaft reverse gear drives the countershaft via the reverse selector which drives the reverse 
selector hub.  



The rotation direction of the countershaft reverse gear is changed via the reverse idler gear.  



Power is transmitted to the final drive gear, which in turn drives the final driven gear and the transfer 
drive gear.  



The transfer output shaft drives the transfer hypoid drive gear/shaft and the transfer output shaft (hypoid 
gear). 

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

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Fig. 23: Power Flow Diagram (R Position) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Electronic Control System 

Electronic Control 

The electronic control system consists of the powertrain control module (PCM), sensors, and seven solenoid 
valves. Shifting and lock-up are electronically controlled for comfortable driving under all conditions. 

Functional Diagram 

The PCM receives input signals from the sensors, switches, and other control units, processes data, and outputs 
signals for the engine control system and A/T control system. The A/T control system includes shift control, 

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

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clutch pressure control, and lock-up control. The PCM switches the shift solenoid valves and the A/T clutch 
pressure control solenoid valves to control shifting transmission gears and lock-up torque converter clutch. 

Fig. 24: Electronic Control System Functional Diagram 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Shift Control 

The PCM instantly determines which gear should be selected by various signals sent from sensors and switches, 
and it actuates shift solenoid valves A, B, C, and D to control gear selection. 

There are two types of shift solenoid valves: 



Shift solenoid valves A and D use the ON-OPEN/OFF-CLOSE type; the shift solenoid valve opens the 
port of shift solenoid valve pressure while the shift solenoid valve is turned ON by the PCM, and closes 
the port when shift solenoid valve is OFF.  



Shift solenoid valves B and C use the ON-CLOSE/OFF-OPEN type; the shift solenoid valve closes the 

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

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© 2005 Mitchell Repair Information Company, LLC. 

port of shift solenoid valve pressure while the shift solenoid valve is turned ON by the PCM, and opens 
the port when shift solenoid valve is OFF.  

The combination of driving signals to shift solenoid valves A, B, C, and D are shown in the table. 

SHIFT SOLENOID VALVES REFERENCE 

Shift Control - Grade Logic Control 

The grade logic control system is used to control shifting in D and D3. The PCM compares actual driving 
conditions with programmed driving conditions, based on the input from the throttle position sensor, the engine 
coolant temperature sensor, the barometric pressure sensor, the brake pedal position switch signal, and the shift 

Position

Gear position

Shift solenoid valves

A

B

C

D

D and D3

Shifting from N

OFF

ON

OFF

OFF

Stays in 1st

OFF

ON

ON

OFF

Shifting gears 
between 1st and 
2nd

ON

ON

ON

OFF or ON

Stays in 2nd

ON

ON

OFF

OFF or ON

Shifting gears 
between 2nd and 
3rd

ON

ON

ON

OFF or ON

Stays in 3rd

ON

OFF

ON

OFF or ON

D

Shifting gears 
between 3rd and 
4th

ON

OFF

OFF

OFF or ON

Stays in 4th

OFF

OFF

OFF

OFF or ON

Shifting gears 
between 4th and 
5th

OFF

OFF

ON

OFF or ON

Stays in 5th

OFF

ON

ON

OFF or ON

M

1st

OFF

ON

ON

OFF or ON

2nd

ON

ON

OFF

OFF or ON

3rd

ON

OFF

ON

OFF or ON

4th

OFF

OFF

OFF

OFF or ON

5th

OFF

ON

ON

OFF or ON

N

Neutral

OFF

ON

OFF

OFF

R

Shifting from P 
and N

OFF

ON

OFF

ON

Stays in reverse

ON

ON

OFF

ON

Reverse inhibit 
control

OFF

ON

OFF

OFF

P

Park

OFF

ON

OFF

ON

 

2007 Acura RL 

2005-08 TRANSMISSION Automatic Transmission - RL

  

me 

 

Friday, June 05, 2009 1:18:11 PM

Page 54 

© 2005 Mitchell Repair Information Company, LLC.