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Acura CSX. Manual - part 239

０７

In 5th Gear

14-37

MAINSHAFT
5TH GEAR

COUNTERSHAFT
5TH GEAR

5TH CLUTCH

FINAL DRIVEN GEAR

TORQUE
CONVERTER

COUNTERSHAFT

FINAL
DRIVE GEAR

MAINSHAFT

• Hydraulic pressure is applied to the 5th clutch, then the 5th clutch engages the mainshaft 5th gear with the

mainshaft.

• The mainshaft 5th gear drives the countershaft 5th gear and the countershaft.
• Power is transmitted to the final drive gear, which in turn drives the final driven gear.

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０８

R Position

14-38

Automatic Transmission

MAINSHAFT
REVERSE GEAR

REVERSE IDLER GEAR

COUNTERSHAFT
REVERSE GEAR

4TH CLUTCH

REVERSE SELECTOR

REVERSE SELECTOR HUB

FINAL DRIVEN GEAR

TORQUE
CONVERTER

COUNTERSHAFT

FINAL
DRIVE GEAR

MAINSHAFT

• Hydraulic pressure is applied to the servo valve to engage the reverse selector with the countershaft reverse gear

and the reverse selector hub while the shift lever is in R.

• Hydraulic pressure is also applied to the 4th clutch, then the 4th clutch engages the mainshaft reverse gear with the

mainshaft.

• The mainshaft reverse gear drives the countershaft reverse gear via the reverse idler gear.
• The rotational direction of the countershaft reverse gear is changed by the reverse idler gear.
• The countershaft reverse gear drives the countershaft via the reverse selector, which drives the reverse selector hub.
• Power is transmitted to the final drive gear, which in turn drives the final driven gear.

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＊０１

ＳＮＲ９ＡＡ１Ｅ１０４１０６０００００ＣＡＡＴ０３

＋ −

Electronic Control System

Functional Diagram

14-39

*1: ’06-07 models
*2: ’08-09 models

Engine RPM Signal

Accelerator Pedal
Position Sensor Signal

Barometric Pressure
Sensor Signal

Manifold Absolute
Pressure Sensor Signal

ATF Temperature
Sensor Signal

Service Check Signal

Transmission
Range
Switch
Signal

Brake Pedal Position
Switch Signal

PGM-FI Control
System

PCM

A/T Control System

Shift Control

• Ascending

Control

• Descending

Control

• D-paddle Shift

Control

•

Clutch Pressure
Control

Lock-up Control

Shift Lock Control

Shift Lock Solenoid

Vehicle Speed Signal
Data Link Connector

Shift Solenoid Valve E

Shift Solenoid Valve D

Shift Solenoid Valve C

Shift Solenoid Valve B

Shift Solenoid Valve A

F-CAN Line

Automatic
Five-speed and
Reverse

Lock-up
ON/OFF

Lock-up
Conditions

Sequential
Sportshift
Control

Gauge Control Module
(Tach) A/T Gear
Position Indicator

Engine Coolant
Temperature Sensor Signal

2nd Clutch Transmission
Fluid Pressure Switch Signal

ABS Modulator-Control
Unit Signal (via F-CAN line)*

Output Shaft (Countershaft)
Speed Sensor Signal

Paddle Shifter

(Upshift/Downshift Switch)

3rd Clutch Transmission
Fluid Pressure Switch Signal

VSA Modulator-Control
Unit Signal (via F-CAN line)*

Input Shaft (Mainshaft)
Speed Sensor Signal

Grade Logic Control

Self-diagnosis/
Fail-safe Function
Communication and
Output Function

A/T Clutch Pressure
Control Solenoid Valve C

A/T Clutch Pressure
Control Solenoid Valve B

A/T Clutch Pressure
Control Solenoid Valve A

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

The PCM receives input signals from sensors, switches, and other control units, processes data, and outputs signals
for the engine control system and the A/T control system. The A/T control system includes shift control, grade logic
control, clutch pressure control, and lock-up control.
The PCM switches the shift solenoid valves and the A/T clutch pressure control solenoid valves ON and OFF to control
gear selection and torque converter clutch lock-up.

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Shift Control

Position

Gear Position

Shift Solenoid Valve

14-40

Automatic Transmission

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, D, and E to control gear selection.

Shift solenoid valves are a normally closed type. Shift solenoid valve opens the port of shift solenoid valve pressure
leading to shift valves while shift solenoid valve is turned ON by the PCM, and closes the port when shift solenoid
valve is OFF.

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

D and S

Shifting from N

OFF

Stays in 1st

OFF

Shifting gears between 1st and
2nd

OFF

Stays in 2nd

OFF

OFF or ON

Shifting gears between 2nd and
3rd

OFF

OFF or ON

Stays in 3rd

OFF

OFF or ON

Shifting gears between 3rd and
4th

OFF

OFF or ON

Stays in 4th

OFF

OFF or ON

Shifting gears between 4th and
5th

OFF

OFF or ON

Stays in 5th

OFF

OFF or ON

Neutral

OFF

Shifting from P and N

OFF

Stays in reverse

OFF

Reverse inhibit control

OFF

Park

OFF

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