Acura TSX / Honda Accord CL. Manual — part 936

Fig. 60: D Position: Driving In 1st Gear Hydraulic Flow

D Position: Shifting between 1st gear & 2nd gear

As the speed of the vehicle reaches the prescribed value, the PCM turns shift solenoid valve A OFF, and keeps
B and C ON, and D and E OFF. Shift solenoid valve A pressure (SA) in the right side of the shift valve A is
released. Shift valve A is moved to the right side to uncover the ports of A/T clutch pressure control solenoid
valve pressure leading to the 1st and 2nd clutches. The PCM controls the A/T clutch pressure control solenoid
valve to regulate hydraulic pressure. A/T clutch pressure control solenoid valve A pressure (55) changes to 1st
clutch pressure (10) at shift valve B, and A/T clutch pressure control solenoid valve B pressure (56) changes to
2nd clutch pressure (20) at shift valve A. The 1st and 2nd clutches are engaged gently.

NOTE:

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

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 61: D Position: Shifting Between 1st Gear & 2nd Gear Hydraulic Flow

D Position: Driving in 2nd gear

The PCM turns shift solenoid valves C OFF, D ON, and keeps A and E OFF, and B ON. Shift solenoid valve C
pressure (SC) in the right side of the shift valve C is released. Shift valve C is moved to the right side to switch
the ports. This movement covers A/T clutch pressure control solenoid valve pressure ports to stop at the shift
valves C and A, and uncover the line pressure port leading to the 2nd clutch.

Fluid flows to 2nd clutch by way of:

Line pressure (1) --> Manual valve--Line pressure (4) --> Shift valve C--Line pressure (5E) --> Shift valve B--
Line pressure (5F) --> Shift valve A--2nd clutch pressure (20) --> 2nd clutch

The 2nd clutch pressure (20) is applied to the 2nd clutch, and the 2nd clutch is engaged securely.

NOTE:

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

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 62: D Position: Driving In 2nd Gear Hydraulic Flow

D Position: Shifting between 2nd gear & 3rd gear

As the speed of the vehicle reaches the prescribed value, the PCM turns shift solenoid valve C ON, and keeps A
and E OFF, and B and D ON. Shift solenoid valve C pressure (SC) is applied to the right side of shift valve C.
Shift valve C is moved to the left side to uncover the ports of A/T clutch pressure control solenoid valves
leading to the 2nd and 3rd clutches. The PCM controls the A/T clutch pressure control solenoid valves to
regulate hydraulic pressure. A/T clutch pressure control solenoid valve B pressure (56) changes to 2nd clutch
pressure (20) at the shift valve A, and A/T clutch pressure control solenoid valve C pressure (57) changes to 3rd
clutch pressure (30) at the shift valve A. The 2nd and 3rd clutches are engaged gently.

NOTE:

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

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 63: D Position: Shifting Between 2nd Gear & 3rd Gear Hydraulic Flow

D Position: Driving in 3rd gear

The PCM turns shift solenoid valves A, B, D, and E OFF, and C ON. Shift solenoid valve B pressure (SB) in
the right side of shift valve B is moved to the right side. Shift solenoid valve D pressure (SD) in the left side of
the shift valve D is released, and the shift valve D is moved to the left side. This valve movement switches A/T
clutch pressure control solenoid valve C pressure port leading to the 3rd clutch.

A/T clutch pressure control solenoid valve C pressure (57) changes to (5J) at the shift solenoid valve D and to
(5K) at the shift valve B, and becomes 3rd clutch pressure (30) at the shift valve A. The 3rd clutch pressure (30)
is applied to the 3rd clutch, and the 3rd clutch is engaged securely.

NOTE:

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

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed