Acura CSX. Manual — part 240
03
Shift Control - Grade Logic Control
14-41
Transmission Range
Switch Signal
PCM
Brake Pedal Position
Switch Signal
Engine RPM
Control
Engine RPM Signal
Output Shaft
(Countershaft)
Speed Sensor Signal
Input Shaft
(Mainshaft)
Speed Sensor Signal
Engine Coolant
Temperature
Sensor Signal
Shift Position
Control
Fail-safe Control
Actual Driving
Shift Position
Read of ATF
Temperature
Master Target of
Shifting Position
Correction of Data
Selection of
Shifting Mode
Grade Logic Control
Calculation of
Gradient
Correction of Engine
Coolant Temperature
Sensor Signal Data
Shift Solenoid
Valve A
ATF Temperature
Sensor Signal
Comparison
with Signals
Accelerator Pedal
Position Sensor Signal
Throttle Position
Sensor Signal
Barometric Pressure
Sensor Signal
Shift Solenoid
Valve B
Shift Solenoid
Valve C
Shift Solenoid
Valve D
Shift Solenoid
Valve E
A grade logic control system has been adopted to control shifting in D, and in S with automatic shift mode. The PCM
compares actual driving conditions with programmed driving conditions, based on the input from the accelerator
pedal position sensor, the throttle position sensor, the engine coolant temperature sensor, the barometric pressure
sensor, the brake pedal position switch signal, the output shaft (countershaft) speed sensor signal, and the shift lever
position signal, to control shifting while the vehicle is ascending or descending a slope.
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02
03
Grade Logic Control: Ascending Control
Grade Logic Control: Descending Control
14-42
Automatic Transmission
100 %
50
0
Vehicle speed
ASCENDING MODE: Upshift Schedule
: FLAT ROAD MODE
: GRADUAL ASCENDING MODE
: MEDIUM ASCENDING MODE
: STEEP ASCENDING MODE
: HEAVY STEEP ASCENDING MODE
T
h
ro
tt
le
openin
g
50
0
DESCENDING MODE: Downshift Schedule
: FLAT ROAD MODE
: GRADUAL DESCENDING MODE
: MEDIUM DESCENDING MODE
: STEEP DESCENDING MODE
Vehicle speed
100 %
T
h
ro
tt
le
openin
g
3RD
4TH
4TH
2ND
1ST
5TH
2ND
3RD
3RD
4TH
2ND
1ST
5TH
2ND
3RD
4TH
When the PCM determines that the vehicle is climbing a hill in D, and S with automatic shift mode, the system extends
the engagement area of 2nd, 3rd, and 4th gears to prevent the transmission from frequently shifting between 2nd and
3rd gears, between 3rd and 4th gears, and between 4th and 5th gears. Then PCM does this so the vehicle can run
smoothly and have more power when needed.
NOTE: Shift commands stored in the PCM between 2nd and 3rd gears, between 3rd and 4th gears, and between 4th
and 5th gears, enable it to automatically select the most suitable gear according to the magnitude of a gradient.
When the PCM determines that the vehicle is going down a hill in D, and S with automatic shift mode, the upshift
speed from 4th to 5th gear, from the 3rd to 4th gear, and from 2nd to 3rd gear (when the throttle is closed) becomes
higher than the set speed for flat road driving to extend 4th gear, 3rd gear, and 2nd gear driving area. This, in
combination with engine braking from the deceleration lock-up, achieves smooth driving when the vehicle is
descending. There are three descending modes with different 4th gear driving areas, 3rd gear driving areas, and 2nd
gear driving areas according to the magnitude of a gradient stored in the PCM. When the vehicle is in 5th gear or 4th
gear, and you are decelerating when you are applying the brakes on a steep hill, the transmission will downshift to
lower gear. When you accelerate, the transmission will then return to a higher gear.
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+
−
−
+
+
−
+
*02
Shift Control - Manual Shift Mode
D-Paddle Shift Mode
14-43
SHIFT INDICATOR
The transmission is provided with a D-paddle shift mode in D, and with a sequential sportshift mode in S. Both modes
are entered by pressing the paddle shifter
(upshift switch) or the paddle shifter
(downshift switch) while driving.
When the transmission is switched into the D-paddle shift mode by pressing the paddle shifters while driving in D, the
transmission can shift into a lower gear by pressing the paddle shifter
(downshift switch), and it can shift into a
higher gear by pressing the paddle shifter
(upshift switch). When the transmission shifts into a lower gear or a
higher gear by pressing the paddle shifters, the shift indicator in the gauge control module (tach) displays the number
of current gear selected. This number of the gear goes off when the transmission downshifts automatically, or when
the transmission upshifts automatically while coasting.
The transmission stays in 5th gear if the paddle shifter
(upshift switch) is pressed when driving in 5th gear, and the
shift indicator displays ‘‘5’’ for 2 seconds, then goes off. The transmission stays in 1st gear if the paddle shifter
is
pressed when driving in 1st gear, and the shift indicator displays ‘‘1’’ for 2 seconds, then goes off.
The transmission stays in the current gear and does not upshift to the next higher gear if the paddle shifter
is
pressed while driving below the minimum allowable speed, and the shift indicator blinks the number of the next
higher gear several times, then returns to the number of the current gear.
NOTE: D-paddle shift mode has been added for ’08-09 models.
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−
−
+
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*03
S Position Automatic Shift Mode and Sequential Sportshift Mode
14-44
Automatic Transmission
SHIFT INDICATOR
’’M’’ INDICATOR
The S position has two shifting modes; the automatic shift mode and the sequential sportshift mode. In the S position
automatic shift mode, the transmission upshifts and downshifts automatically from 1st through 4th gear, and the
paddle shifters are ready to be activated to switch to the sequential sportshift mode. In the automatic shift mode, the
shift indicator and the M indicator in the gauge control module (tach) do not come on.
When the paddle shifter
(upshift switch) or the paddle shifter
(downshift switch) is pressed, the automatic shift
mode is canceled and the sequential sportshift mode comes into operation. The shift indicator displays the number of
the selected gear, and the M indicator comes on. In the sequential sportshift mode, the driver can shift up and down
manually from 1st through 5th gear by using the paddle shifters, much like a manual transmission. The paddle shifters
are installed on the back of the steering wheel, and the driver can shift gears by pressing the paddle shifters without
taking either hand off the steering wheel.
In the sequential sportshift mode, the transmission must be shifted up and down by pressing the paddle shifters.
However, the transmission cannot downshift and stays in the current gear if the paddle shifter
is pressed while the
vehicle is coasting at a speed that would cause the engine to over-rev by downshifting the transmission, and the shift
indicator blinks the number of the selected gear several times, then returns to the number of the current gear. If the
vehicle speed reaches an appropriate speed while the shift indicator is blinking the number of the selected gear, the
transmission downshifts and the shift indicator displays the selected gear. The transmission also cannot upshift and
stays in the current gear if the paddle shifter
is pressed while driving below an appropriate upshifting speed, the
shift indicator blinks the number of the selected gear several times, then returns to the number of the current gear. If
the vehicle speed reaches an appropriate upshift speed while the shift indicator is blinking the number of the selected
gear, the transmission upshifts and the shift indicator displays the selected gear.
This mode has automatic downshifting areas so the vehicle can run smoothly with more power to cope with upcoming
acceleration. When coasting in 5th gear or 4th gear, the transmission downshifts to the next lower gear if the vehicle
slows down to the programmed speed, or by pressing the brake pedal.
When the transmission decelerates to a stop, the transmission shifts to 1st gear automatically. The transmission can
be shifted to 2nd gear by pressing the paddle shifter
while the vehicle is stopped, and the vehicle can start off in 2nd
gear.
The sequential sportshift mode is canceled when moving the shift lever to any position other than S.
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