Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Acura 3.5RL 1996-2004 Approved srm RL9604S14038A

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             Main Menu                 Table of Contents

Description

 Lock-up System
 Lock-up Clutch

 1. Operation (clutch on)
   With the lock-up clutch on, the fluid in the chamber between the torque converter cover and the lock-up piston is drained
   off, and the converter fluid exerts pressure through the piston against the torque converter cover. As a result, the converter
   turbine is locked to the converter cover. The effect is to bypass the converter, thereby placing the vehicle in direct drive.



                                                       LOCK-UP PISTON                DAMPER SPRING

                                                                                                     TURBINE
                                      TORQUE CONVERTER
                                      COVER




                                                                                                  MAINSHAFT
2. Operation (clutch off)
  With the lock-up clutch off, the fluid flows in the reverse of CLUTCH ON. As a result, the lock-up piston moves away from
  the converter cover, and the torque converter lock-up is released.




                                TORQUE CONVERTER
                                COVER
            Main Menu                 Table of Contents




In     position in 2nd, 3rd and 4th, and  position in 3rd, pressurized fluid is drained from the back of the torque converter
 through a passage, causing the lock-up piston to be held against the torque converter cover. As this takes place, the main-
 shaft rotates at the same speed as the engine crankshaft. Together with hydraulic control, the PCM optimizes the timing of
the lock-up system. Under certain conditions, the lock-up clutch is applied during deceleration in 3rd and 4th gear.

The lock-up system controls the range of lock-up according to torque converter clutch (lock-up control) solenoid valves A
and B, and the throttle valve. When torque converter clutch solenoid valves A and B activate, modulator pressure
changes. Torque converter clutch solenoid valves A and B are mounted on the torque converter housing, and are con-
trolled by the PCM.

NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.
             Main Menu                 Table of Contents

Description
 Lock-up System (cont'd)
 No Lock-up
 The pressurized fluid regulated by the modulator works on both ends of the lock-up shift valve and on the left side of the
 lock-up control valve. Under this condition, the pressures working on both ends of the lock-up shift valve are equal, and
 the shift valve is moved to the right side by the tension of the valve spring alone. The fluid from the pump will flow
 through the left side of the lock-up clutch to the torque converter; that is, the lock-up clutch is in OFF condition.

 NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.
            Main Menu                  Table of Contents




Partial Lock-up
Torque Converter Clutch (Lock-up Control) Solenoid Valve A: ON Torque Converter Clutch (Lock-up Control) Solenoid
Valve B: OFF
The PCM switches the solenoid valve A on to release the modulator pressure in the left cavity of the lock-up shift valve.
The modulator pressure in the right cavity of the lock-up shift valve overcomes the spring force; thus the lock-up shift
valve is moved to the left side.
The line pressure is then separated into the two passages to the torque converter:
    Torque Converter Inner Pressure: enters into right side to engage lock-up clutch
   Torque Converter Back Pressure: enters into left side to disengage lock-up clutch
The back pressure (F2) is regulated by the lock-up control valve, whereas the position of the lock-up timing valve is deter-
mined by the throttle B pressure, tension of the valve spring, and pressure regulated by the modulator valve. Also the posi-
tion of the lock-up control valve is determined by the back pressure of the lock-up control valve and torque converter pres-
sure regulated by the check valve. With the torque converter clutch solenoid valve B kept off, the modulator pressure is main-
tained in the left side of the lock-up control valve; in other words, the lock-up control valve is moved slightly to the right side.
This slight movement of the lock-up control valve causes the back pressure to be lowered slightly, resulting in partial lock-up.

NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.
            Main Menu                 Table of Contents

Description
 Lock-up System (cont'd)
 Half Lock-up
 Torque Converter Clutch (Lock-up Control) Solenoid Valve A: ON Torque Converter Clutch (Lock-up Control) Solenoid
 Valve B: ON
 The modulator pressure is released by the solenoid valve B, causing the modulator pressure in the left side of the lock-up
 control valve to lower.
 Also the modulator pressure in the left cavity of the lock-up timing valve is low. However, throttle B pressure is still low at
 this time; consequently, the lock-up timing valve is kept on the right side by the spring force.
 With the torque converter clutch solenoid valve B turned on, the lock-up control valve is moved somewhat to the left side,
 causing the back pressure (F2) to lower. This allows a greater amount of the fluid (F1) to work on the lock-up clutch so as
 to engage the clutch. The back pressure (F2) which still exists prevents the clutch from engaging fully.

 NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.
           Main Menu                 Table of Contents




Full Lock-up
Torque Converter Clutch (Lock-up Control) Solenoid Valve A: ON Torque Converter Clutch (Lock-up Control) Solenoid
Valve B: ON
When the vehicle speed further increases, throttle B pressure is increased in accordance with the throttle opening.
Throttle B pressure (55) flows to the right side of the lock-up timing valve and the lock-up control valve, and they are moved
to the left side. The lock-up timing valve covers the port leading torque converter pressure (90) from the torque converter to
the lock-up control valve. The lock-up control valve uncovers the port to leak the torque converter pressure (94) and (96). As
this takes place, torque converter back pressure is released fully, causing the lock-up clutch to be engaged fully.

NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.




                                                                        THROTTLE B PRESSURE
              Main Menu                 Table of Contents

Description

 Lock-up System (cont'd)
 Deceleration Lock-up
 Torque Converter Clutch (Lock-up Control) Solenoid Valve A: ON Torque Converter Clutch (Lock-up Control) Solenoid
 Valve B: Duty Operation
 The PCM switches solenoid valve B on and off rapidly under certain conditions. The slight lock-up and half lock-up regions
 are maintained so as to lock the torque converter properly.

 NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.

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