Acura CSX. Manual — part 237
Gear Selection
Position
Description
Automatic Transmission Gear Position Indicator
Shift Indicator and M Indicator
14-29
The shift lever has five positions; P: PARK, R: REVERSE, N: NEUTRAL, D: DRIVE 1st through 5th gear ranges with
D-position automatic shift mode and D-paddle shift mode, S: DRIVE 1st through 5th gear ranges with S-position
automatic shift mode and sequential sportshift mode.
P: PARK
Front wheels locked; the park pawl engaged with the park gear on the
countershaft. All clutches are released.
R: REVERSE
Reverse; the reverse selector engaged with the countershaft reverse gear
and the 5th clutch engaged.
N: NEUTRAL
All clutches are released.
D: DRIVE
(1st through 5th)
General driving; starts off in 1st, shifts automatically to 2nd, 3rd, 4th, then
5th gear, depending on the vehicle speed and throttle position. Downshifts
through 4th, 3rd, 2nd, and 1st on deceleration to stop. The lock-up
mechanism operates in 2nd, 3rd, 4th, and 5th gears.
S: DRIVE
(1st through 5th)
S-position
automatic shift
mode
For rapid acceleration at highway speeds and general driving; starts off in
1st, shifts automatically to 2nd, 3rd, 4th, then 5th gear, depending on
vehicle speed and throttle position. Downshifts through 4th, 3rd, 2nd, and
1st gear on deceleration to stop. The lock-up mechanism operates in 2nd,
3rd, 4th, and 5th gears.
Sequential
sportshift mode
Manual gear shift driving; vehicle can starts off in 1st and 2nd gears, and
does not upshift automatically.
NOTE: D-paddle shift mode has been added for ’08-09 models.
Starting the engine is possible only in P and N because of a slide-type neutral-safety switch.
The A/T gear position indicator in the gauge control module (tach) shows which shift lever position has been selected
without having to look down at the console.
When the transmission is switched into the sequential sportshift mode, the shift indicator in the gauge control module
(tach) displays the gear selected, and the M indicator next to the shift indicator comes on. The shift indicator also
displays the gear selected in the D-paddle shift mode, but the M indicator does not come on.
NOTE: D-paddle shift mode has been added for ’08-09 models.
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Clutches and Gears
14-30
Automatic Transmission
REVERSE
IDLER GEAR
5TH CLUTCH
3RD
CLUTCH
MAINSHAFT
5TH GEAR
COUNTERSHAFT
REVERSE GEAR
REVERSE SELECTOR
HUB
REVERSE
SELECTOR
COUNTERSHAFT
4TH GEAR
COUNTERSHAFT
2ND GEAR
2ND CLUTCH
SECONDARY SHAFT
1ST GEAR
SECONDARY SHAFT
IDLER GEAR
FINAL DRIVEN GEAR
TORQUE CONVERTER
FINAL
DRIVE GEAR
1ST
CLUTCH
PARK GEAR
SECONDARY
SHAFT
2ND GEAR
DIFFERENTIAL ASSEMBLY
RING GEAR
MAINSHAFT
REVERSE GEAR
IDLER SHAFT
IDLER GEAR
SECONDARY SHAFT
3RD GEAR
COUNTERSHAFT 3RD GEAR
COUNTERSHAFT
1ST GEAR
MAINSHAFT
IDLER GEAR
MAINSHAFT
4TH GEAR
4TH CLUTCH
COUNTERSHAFT
5TH GEAR
The five-speed automatic transmission uses hydraulically-actuated clutches to engage or disengage the transmission
gears. When hydraulic pressure is introduced into the clutch drum, the clutch piston moves. This presses the friction
discs and the steel plates together, locking them so they do not slip. Power is then transmitted through the engaged
clutch pack to its hub-mounted gear. Likewise, when the hydraulic pressure is bled from the clutch pack, the piston
releases the friction discs and the steel plates, and they are free to slide past each other. This allows the gear to spin
independently on its shaft, transmitting no power.
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1st Clutch
2nd Clutch
3rd Clutch
4th Clutch
5th Clutch
Gear operation
14-31
The 1st clutch engages/disengages 1st gear, and is located at the middle of the secondary shaft. The 1st clutch is
joined back-to-back to the 3rd clutch. The 1st clutch is supplied hydraulic pressure by its ATF feed pipe within the
secondary shaft.
The 2nd clutch engages/disengages 2nd gear, and is located at the end of the secondary shaft, opposite the end cover.
The 2nd clutch is supplied hydraulic pressure by a circuit connected to the internal hydraulic circuit.
The 3rd clutch engages/disengages 3rd gear, and is located at the middle of the secondary shaft. The 3rd clutch is
joined back-to-back to the 1st clutch. The 3rd clutch is supplied hydraulic pressure by its ATF feed pipe within the
secondary shaft.
The 4th clutch engages/disengages 4th gear, as well as reverse gear, and is located at the middle of the mainshaft. The
4th clutch is joined back-to-back to the 5th clutch. The 4th clutch is supplied hydraulic pressure by its ATF feed pipe
within the mainshaft.
The 5th clutch engages/disengages 5th gear, and is located at the middle of the mainshaft. The 5th clutch is joined
back-to-back to the 4th clutch. The 5th clutch is supplied hydraulic pressure by its ATF feed pipe within the mainshaft.
Gears on the mainshaft:
• 4th gear engages/disengages with the mainshaft by the 4th clutch.
• 5th gear engages/disengages with the mainshaft by the 5th clutch.
• Reverse gear engages/disengages with the mainshaft by the 4th clutch.
• Idler gear is splined with the mainshaft, and rotates with the mainshaft.
Gears on the countershaft:
• Final drive gear is integral with the countershaft.
• 1st, 2nd, 3rd, 5th, and park gears are splined with the countershaft, and rotate with the countershaft.
• 4th gear and reverse gear rotate freely from the countershaft. The reverse selector engages 4th gear and reverse
gear with the reverse selector hub. The reverse selector hub is splined to the countershaft so that 4th gear and the
reverse gear engage with the countershaft.
Gears on the secondary shaft:
• 1st gear engages/disengages with the secondary shaft by the 1st clutch.
• 2nd gear engages/disengages with the secondary shaft by the 2nd clutch.
• 3rd gear engages/disengages with the secondary shaft by the 3rd clutch.
• Idler gear is splined with the secondary shaft, and rotates with the secondary shaft.
The idler gear on the idler shaft transmits power between the mainshaft and the secondary shaft.
The reverse idler gear transmits power from the mainshaft reverse gear to the countershaft reverse gear, and changes
rotational direction of the countershaft to reverse.
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Power Flow
P Position
N Position
14-32
Automatic Transmission
TORQUE
CONVERTER
COUNTERSHAFT
MAINSHAFT
MAINSHAFT
IDLER GEAR
SECONDARY SHAFT
IDLER GEAR
IDLER SHAFT
IDLER GEAR
IDLER SHAFT
SECONDARY SHAFT
COUNTERSHAFT
4TH GEAR
COUNTERSHAFT
REVERSE GEAR
PARK GEAR
REVERSE
SELECTOR HUB
REVERSE
SELECTOR
Hydraulic pressure is not applied to the clutches. Power is not transmitted to the countershaft. The countershaft is
locked by the park pawl interlocking the park gear.
Engine power transmitted from the torque converter drives the mainshaft idler gear, the idler shaft idler gear, and the
secondary shaft idler gear, but hydraulic pressure is not applied to the clutches. Power is not transmitted to the
countershaft.
In this position, the position of the reverse selector differs according to whether the shift lever shifted from D or R:
• When shifted from D, the reverse selector engages with the countershaft 4th gear and the reverse selector hub, and
4th gear engages with the countershaft.
• When shifted from R, the reverse selector engages with the countershaft reverse gear and the reverse selector hub,
and reverse gear engages with the countershaft.
08/08/21 14:38:17 61SNR030_140_0034
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