2006 ACURA CSX automatic transmission

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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 SignalTransmission
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
ReverseLock-up
ON/OFF
Lock-up
Conditions
Sequential
Sportshift
Control Gauge Control Module
(Tach) A/T Gear
Position Indicator
Engine Coolant
Temperature Sensor Signal
2ndClutchTransmission
Fluid Pressure Switch Signal ABS Modulator-Control
Unit Signal (via F-CAN line)*
Output Shaft (Countershaft)
Speed Sensor Signal
Paddle Shifter /
(Upshift/Downshift Switch) 3rdClutchTransmission
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/TClutchPressure
Control Solenoid Valve C A/TClutchPressure
Control Solenoid Valve B A/TClutchPressure
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.
(cont’d)
08/08/21 14:38:21 61SNR030_140_0041
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Electronic Control System (cont’d)
Shift ControlPosition Gear Position Shift Solenoid Valve
ABCDE
14-40 Automatic Transmission
System Description (cont’d)
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 OFFONONONOFForON
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
08/08/21 14:38:21 61SNR030_140_0042
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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 PositionRead 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 l ever
position signal, to control shifting while the vehicle is ascending or descending a slope.
(cont’d)
08/08/21 14:38:21 61SNR030_140_0043
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Electronic Control System (cont’d)
Grade Logic Control: Ascending Control
Grade Logic Control: Descending Control
14-42Automatic Transmission
System Description (cont’d)
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
Throttle opening
50
0 DESCENDING MODE: Downshift Schedule
: FLAT ROAD MODE
: GRADUAL DESCENDING MODE : MEDIUM DESCENDING MODE
: STEEP DESCENDING MODE
Vehicle speed
100 %
Throttle opening
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.
08/08/21 14:38:22 61SNR030_140_0044
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Î 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.
(cont’d)
08/08/21 14:38:22 61SNR030_140_0045
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Electronic Control System (cont’d)
S Position Automatic Shift Mode and Sequential Sportshift Mode
14-44 Automatic Transmission
System Description (cont’d)
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.
08/08/21 14:38:23 61SNR030_140_0046
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Electronic Control System (cont’d)
Lock-up Control
14-46Automatic Transmission
System Description (cont’d)
PCM
Engine RPM Signal Engine Coolant
Temperature
Sensor Signal Barometric
Pressure
Sensor
Signal
Input Shaft
(Mainshaft)
Speed Sensor Signal Output Shaft
(Countershaft)
Speed Sensor Signal
ATF Temperature
Sensor Signal Actual
Driving
Shift
Position
Transmission Range
Switch Signal
Correction
of ATF
Temperature
Sensor DataShifting Position
Control
Current Feedback
Accelerator Pedal
Position Sensor Signal
Throttle Position
Sensor Signal
Driving
Shift
Position
Information
 Engine Coolant
Temperature Control
Lock-up Control
Lock-up ON/OFF
Control
A/T Clutch Pressure
Control Solenoid
Valve A
Gradient Control
by Magnitude
Fail-safe Control
Lock-up Condition
Control
Master Target of
Controlling Current Shift Solenoid
Valve E
Shift solenoid valve E controls the hydraulic pressure to switch the lock-up shift valve and lock-up ON and OFF. When
the PCM actuates shift solenoid valve E and A/T clutch pressure control solenoid valve A to start lock-up. A/T clutch
pressure control solenoid valve A regulates and applies hydraulic pressure to the lock-up control valve to control the
amount of lock-up. The lock-up mechanism operates in D and S (2nd, 3rd, 4th, and 5th gears).
08/08/21 14:38:24 61SNR030_140_0048
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Self-diagnosisOne Drive Cycle Detection Method:
Two Drive Cycle Detection Method:
Fail-safe Function
14-47
If the PCM detects the failure of a signal from a sensor, a switch, a solenoid valve, or from another control unit it stores
a Temporary DTC or a DTC. Depending on the failure, a DTC is stored in either the first or the second drive cycle. When
a DTC is stored, the PCM blinks the D indicator and/or turns on the malfunction indicator lamp (MIL) by a signal sent to
the gauge control module via F-CAN.  When an abnormality occurs in the signal from a sensor, a switch, a solenoid valve, or from another control unit, the
PCM stores a DTC for the failure and blinks the D indicator and/or turns on the MIL immediately.
 When an abnormality occurs in the signal from a sensor, a switch, a solenoid valve, or from another control unit in
the first drive cycle, the PCM stores a Temporary DTC. The D indicator and the MIL do not turns on at this time. If the
failure continues in the second drive cycle, the PCM stores a DTC and blinks the D indicator and/or turns on the MIL.
When an abnormality occurs in the signal from a sensor, a switch, a solenoid valve, or from another control unit, the
PCM ignores that signal and substitutes a pre-programmed value for them that allow the automatic transmission to
continue driving. This causes a DTC to be stored and the D indicator to blink and/or the MIL to come on.
(cont’d)
08/08/21 14:38:24 61SNR030_140_0049
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