Acura CSX. Manual — part 241
*04
Clutch Pressure Control
14-45
PCM
Engine RPM Signal
Engine Coolant
Temperature
Sensor Signal
Input Shaft
(Mainshaft)
Speed Sensor Signal
Output Shaft
(Countershaft)
Speed Sensor Signal
ATF Temperature
Sensor Signal
Actual
Driving Shift
Position
Correction of Data
Correction of Engine
Coolant Temperature
Sensor Data
Manifold Absolute
Pressure Sensor Signal
3rd Clutch
Transmission Fluid
Pressure Switch Signal
2nd Clutch
Transmission Fluid
Pressure Switch Signal
Correction of ATF
Temperature Sensor
Signal Data
Correction of
Hydraulic Pressure
Applying Timing
Correction of Engine
Torque Signal Data
Master Target of
Controlling Current
Decision of
Shifting Mode
Ignition Timing
Requirement
PGM-FI
Control
System
Current
Feedback
A/T Clutch Pressure
Control Solenoid
Valves A, B, and C
PGM-FI
Control
System
Throttle Position
Sensor Signal
B
a
ro
me
tr
ic
P
re
s
s
u
re
Sensor
Si
gnal
The PCM actuates A/T clutch pressure control solenoid valves A, B, and C to control the clutch pressure. When shifting
between lower and higher gears, the clutch pressure regulated by A/T clutch pressure control solenoid valves A, B,
and C engages and disengages the clutch smoothly.
The PCM receives input signals from the various sensors and the switches, processes data, and outputs current to A/T
clutch pressure control solenoid valves A, B, and C.
08/08/21 14:38:23 61SNR030_140_0047
07
Lock-up Control
14-46
Automatic Transmission
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 Data
Shifting 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
Self-diagnosis
One 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.
08/08/21 14:38:24 61SNR030_140_0049
*05
□
△
○
+
−
PCM A/T Control System Electrical Connections
14-48
Automatic Transmission
41
23
41
24
23
4
40
29
26
2
27
20 21
10
8
9
35
19
16 17 18
36
39
40
44
43
42
30
29
32
16
18
17
13 14 15
12
11
7
8
9
6
5
4
3
2
1
31
36
37
40
44
42
27 28 29
33 34
24 25
20 21
14 15
6
5
4
31
23
31
1
3
9
8
7
11 12
15
14
13
17 18
16
22
21
20
25
32
35
34
33
30
28
27
42
43
44
36
22
39
10
26
SHE
B24
RIGHT
SUPP
B16
B40
SDNP
LEFT
F-CAN Transceiver
CANL
A37
CANH
A36
Terminal side of female terminals
A
(44P)
B
(44P)
C
(44P)
C44
C40
B1
B36
B15
ATPS
S
Dash-light Brightness Control Circuit
SG1
C14
NC
C43
VCC1
C13
B33
SG2
B17
NM
B18
VCC2
TATF
B27
B11
SHB
SHA
B10
B20
SHC
B26
SHD
LSC
B25
B35
LSB
PG1
B28
ATPFWD
N
BAT
D
PG2
ATPP
B13
DATA LINK CONNECTOR
R
CPU
LG1
ATPR
B14
SCS
IGNITION SWITCH
LG2
GAUGE CONTROL MODULE (TACH)
B9
OP3SW
OP2SW
B8
ATPRVS
B22
ATPD
B12
P
S
R
P
N
D
B21
ATPN
BKSW
A40
BRAKE LIGHTS
A31
A27
SLS
PCM
C36
IG1
B44
LSA
BATTERY
IG1
BRAKE PEDAL
POSITION SWITCH
SHIFT LOCK
SOLENOID
TRANSMISSION
RANGE SWITCH
A/T CLUTCH PRESSURE
CONTROL SOLENOID VALVE A
A/T CLUTCH PRESSURE
CONTROL SOLENOID VALVE B
A/T CLUTCH PRESSURE
CONTROL SOLENOID VALVE C
SHIFT SOLENOID
VALVE A
SHIFT SOLENOID
VALVE B
SHIFT SOLENOID
VALVE C
SHIFT SOLENOID
VALVE D
ATF
TEMPERATURE
SENSOR
OUTPUT SHAFT
(COUNTERSHAFT)
SPEED
SENSOR
INPUT SHAFT
(MAINSHAFT)
SPEED
SENSOR
2ND CLUTCH TRANSMISSION
FLUID PRESSURE SWITCH
3RD CLUTCH TRANSMISSION
FLUID PRESSURE SWITCH
A/T Gear Position Indicator
Driver Circuit
SHIFT
INDICATOR
SHIFT SOLENOID
VALVE E
PADDLE SHIFTER
(UPSHIFT SWITCH)
PADDLE SHIFTER
(DOWNSHIFT SWITCH)
PCM Connector Terminal Locations
08/08/21 14:38:25 61SNR030_140_0050
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