Acura RL (1996-2004 year). Manual — part 416
Circuit Diagram and Terminal Locations
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Description
The hydraulic control system is controlled by the ATF pump, valves and accumulators in the valve bodies. The ATF pump
is driven by splines on the end of the torque converter which is attached to the engine.
Fluid from the ATF pump flows through the regulator valve to maintain specified pressure through the main valve body to
the manual valve, directing pressure to each of the clutches.
The valve body includes the main valve body, the secondary valve body, the ATF pump body, the regulator valve body,
the throttle valve body, and the accumulator body. The throttle valve body is joined with the A/T clutch pressure control
solenoid valve.
The shift solenoid valves A and B are bolted on the secondary valve body. The torque converter clutch (lock-up control)
solenoid valves A and B are bolted on the outside of the torque converter housing.
ATF PUMP BODY
ACCUMULATOR BODY
SHIFT SOLENOID
VALVE B
SHIFT SOLENOID
VALVE A
REAR COVER
REGULATOR VALVE
BODY
THROTTLE VALVE BODY
SECONDARY VALVE BODY
ATF PASSAGE
MAIN VALVE BODY
Hydraulic Control
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Lower Valve Body Assembly
The lower valve body assembly is located on the bottom of the transmission housing. The lower valve body assembly
consists of the main valve body, the secondary valve body and the ATF passage.
Main Valve Body
The main valve body houses the manual valve, the 1-2 shift valve, the 2-3 shift valve, the 3-4 shift valve, the 4-3 kick-down
valve and the main orifice control valve. The primary functions of the main valve body are to switch fluid pressure on and
off and to control the hydraulic pressure going to the hydraulic control system.
Secondary Valve Body
The secondary valve body is located on the main valve body. The secondary valve body houses the line pressure control
valve, the modulator valve, the 3-4 orifice control valve, the 4-3 shift timing valve, the 1st accumulator piston and the 2nd
accumulator piston. The shift solenoid valves A and B are assembled on the secondary valve body.
Throttle Valve Body/A/T Clutch Pressure Control Solenoid Valve
The throttle valve body is joined with the A/T clutch pressure control solenoid valve which is controlled by the PCM. The
throttle valve body/A/T clutch pressure control solenoid valve is located on the secondary valve body. The throttle valve
body houses the throttle valve.
LINE PRESSURE
CONTROL VALVE
A/T CLUTCH PRESSURE CONTROL
SOLENOID VALVE
SHIFT SOLENOID
VALVE B
SHIFT SOLENOID
VALVE A
MODULATOR VALVE
1ST ACCUMULATOR
PISTON
SECONDARY VALVE
BODY
MAIN VALVE BODY
MANUAL VALVE
MAIN ORIFICE CONTROL VALVE
THROTTLE VALVE BODY
THROTTLE VALVE
2ND ACCUMULATOR
PISTON
3-4 ORIFICE CONTROL
VALVE
4-3
SHIFT TIMING VALVE
4-3 KICK-DOWN
VALVE
3-4 SHIFT VALVE
2-3 SHIFT VALVE
1-2 SHIFT VALVE
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Hydraulic Control (cont'd)
ATF Pump Body
The ATF pump body is located on the torque converter housing. The ATF pump body consists of the ATF pump gears, the
relief valve, the lock-up control valve, the lock-up timing valve and the torque converter check valve. The torque converter
check valve is located between the ATF pump body and the torque converter housing.
Accumulator Body
The accumulator body is located on the torque converter housing next to the ATF pump body. The accumulator body
houses the 3rd accumulator piston and the 4th accumulator piston.
Regulator Valve Body
The regulator valve body is located on the ATF pump body. The regulator valve body consists of the regulator valve, the
cooler relief valve and the lock-up shift valve.
REGULATOR VALVE
BODY
REGULATOR VALVE
4TH ACCUMULATOR
3RD ACCUMULATOR
ATF PUMP BODY
RELIEF VALVE
LOCK-UP CONTROL
VALVE
LOCK-UP TIMING
VALVE
TORQUE CONVERTER
CHECK VALVE
COOLER RELIEF
VALVE
ACCUMULATOR BODY
LOCK-UP SHIFT
VALVE
Description
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