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
1
VSA Modulator-Control
Unit Signal (via F-CAN line)*
2
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
A
B
C
D
E
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
ON
ON
OFF
OFF
Stays in 1st
ON
ON
ON
OFF
OFF
Shifting gears between 1st and
2nd
OFF
ON
ON
OFF
OFF
Stays in 2nd
OFF
ON
OFF
ON
OFF or ON
Shifting gears between 2nd and
3rd
OFF
ON
ON
ON
OFF or ON
Stays in 3rd
OFF
OFF
ON
OFF
OFF or ON
Shifting gears between 3rd and
4th
OFF
OFF
OFF
OFF
OFF or ON
Stays in 4th
ON
OFF
OFF
OFF
OFF or ON
Shifting gears between 4th and
5th
ON
OFF
OFF
ON
OFF or ON
Stays in 5th
ON
OFF
ON
ON
OFF or ON
N
Neutral
OFF
ON
ON
OFF
OFF
R
Shifting from P and N
OFF
ON
OFF
OFF
ON
Stays in reverse
ON
ON
OFF
OFF
ON
Reverse inhibit control
OFF
OFF
ON
OFF
OFF
P
Park
OFF
ON
OFF
OFF
ON
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