Accumulator
The accumulators are located in the regulator valve body and the servo body. The regulator valve body contains
the 1st and 3rd accumulators, and the servo body contains the 2nd, 4th, and 5th accumulators.
Fig. 56: Identifying Accumulators
HYDRAULIC FLOW
Distribution of Hydraulic Pressure
As the engine turns, the ATF pump starts to operate. Automatic transmission fluid (ATF) is drawn through the
ATF strainer (filter) and discharged into the hydraulic circuit. Then, ATF flowing from the ATF pump becomes
line pressure that's regulated by the regulator valve. Torque converter pressure from the regulator valve enters
the torque converter through the lock-up shift valve, and it is discharged from the torque converter. The torque
converter check valve prevents torque converter pressure from rising.
The PCM controls the shift solenoid valves ON and OFF. The shift solenoid valve intercepts line pressure from
the ATF pump via the manual valve when the shift solenoid valve is OFF. When the shift solenoid valve is
turned ON, line pressure changes to shift solenoid valve pressure at the shift solenoid valve, then the solenoid
valve pressure flows to the shift valve. Applying shift solenoid pressure to the shift valves moves the position of
the shift valve, and switches the port of the hydraulic circuit. The PCM also controls A/T clutch pressure
control solenoid valves A, B, and C. The A/T clutch pressure control solenoid valves regulate hydraulic
pressure, and apply the pressure to the clutches to engage smoothly. The clutches receive optimum clutch
pressure which is regulated by the A/T clutch pressure control solenoid valves for comfortable driving and
shifting under all conditions.
2004 Acura TSX
2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed