sensor ACURA CSX 2006 Service Repair Manual

SymptomProbable cause(s) Notes
14-18Automatic Transmission
Symptom Troubleshooting Index (cont’d)













Late shift after
shifting from N to
D and S, or
excessive shock
when shifted into
DandS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15. Shift solenoid valve E
defective
A/T clutch pressure control
solenoid valve A defective
A/T clutch pressure control
solenoid valve B defective
A/T clutch pressure control
solenoid valve C defective
Shift cable broken or out of
adjustment
Connection between the shift
cable and transmission or
body is worn
Input shaft (mainshaft) speed
sensor defective
Output shaft (countershaft)
speed sensor defective
ATF temperature sensor
defective
Foreign material in separator
plate orifice
Servo control valve defective
1st accumulator defective
1st check ball stuck
Lock-up shift valve defective
1st clutch defective Check for a stored DTC, and check for loose
connectors.
Inspect shift solenoid valve E for seizure, and the
O-rings for wear and damage.
Inspect the A/T clutch pressure control solenoid
valve filter/gasket and the O-rings for wear and
damage, and inspect the solenoid valves for
seizure.
Check the input shaft (mainshaft) speed sensor and
the output shaft (countershaft) speed sensor
installation.
Check for a loose shift cable at the shift lever and
the selector control lever.
Check the 1st clutch pressure.
Inspect the clutch piston, the clutch piston check
valve, and the O-rings. Check the spring retainer
and the retainer seal for wear, damage, and peeling.
Inspect the clearance between the clutch end-plate
and the top disc. If the clearance is out of tolerance,
inspect the clutch discs and the plates for wear and
damage. If the discs are worn or damaged, replace
them as a set. Inspect the clutch wave-plate height.
If the height is out of tolerance, replace the wave-
plate. If the discs and the plates are OK, adjust the
clearance with the clutch end-plate.
Check for a clogged orifice in the separator plate. If
the orifice is clogged, remove it and clean the
separator plate orifice.
Check the servo control valve in the main valve
body for free movement, and check the servo
control valve spring for wear and damage.
Inspect the 1st clutch feed pipe. If the 1st clutch
feed pipe is scored, replace the end cover.
Replace the secondary shaft if the bushing for the
1st clutch feed pipe is loose or damaged.
Check the 1st accumulator piston, the O-ring, and
the springs in the regulator valve body for wear
and damage.
Check the lock-up shift valve in the regulator valve
body for free movement, and check the lock-up
shift valve spring for wear and damage.
08/08/21 14:37:09 61SNR030_140_0020
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SymptomProbable cause(s) Notes
14-19














Late shift after
shifting from N to
R, or excessive
shock when shifted
into R
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13. Shift solenoid valve E
defective
A/T clutch pressure control
solenoid valve A defective
Shift cable broken or out of
adjustment
Connection between the shift
cable and transmission or
body is worn
Input shaft (mainshaft) speed
sensor defective
Output shaft (countershaft)
speed sensor defective
ATF temperature sensor
defective
Shift fork shaft stuck
Foreign material in separator
plate orifice
Shift valve E defective
4th/reverse accumulator
defective
Lock-up shift valve defective
4th clutch defective Check for a stored DTC, and check for loose
connectors.
Inspect shift solenoid valve E for seizure, and the
O-rings for wear and damage.
Inspect the A/T clutch pressure control solenoid
valve filter/gasket and the O-rings for wear and
damage, and inspect the solenoid valves for
seizure.
Check the input shaft (mainshaft) speed sensor and
the output shaft (countershaft) speed sensor
installation.
Check for a loose shift cable at the shift lever and
the selector control lever.
Inspect the clutch piston, the clutch piston check
valve, and the O-rings. Check the spring retainer for
wear and damage. Inspect the clearance between
the clutch end-plate and the top disc. If the
clearance is out of tolerance, inspect the clutch
discs and the plates for wear and damage. If the
discs are worn or damaged, replace them as a set.
Inspect the clutch wave-plate height. If the height is
out of tolerance, replace the wave-plate. If the discs
and the plates are OK, adjust the clearance with the
clutch end-plate.
Check for a missing shift fork bolt on the shift fork
shaft.
Check for a clogged orifice in the separator plate. If
the orifice is clogged, remove it and clean the
separator plate orifice.
Check the 4th clutch pressure.
Inspect the servo valve and the O-ring for wear and
damage.
Check shift valve E in the main valve body for free
movement, and check the shift valve E spring for
wear and damage.
Check the lock-up shift valve in the regulator valve
body for free movement, and check the lock-up
shift valve spring for wear and damage.
Transmission does
not shift 1.
2.Input shaft (mainshaft) speed
sensor defective
Output shaft (countershaft)
speed sensor defective Check for a stored DTC, and check for loose
connectors.
Check the input shaft (mainshaft) speed sensor and
the output shaft (countershaft) speed sensor
installation.
(cont’d)
08/08/21 14:37:09 61SNR030_140_0021
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SymptomProbable cause(s) Notes
14-20Automatic Transmission
Symptom Troubleshooting Index (cont’d)















Excessive shock or
flares on all
upshifts and
downshifts
1.
2.
3.
4.
5.
6.A/T clutch pressure control
solenoid valve B defective
A/T clutch pressure control
solenoid valve C defective
Input shaft (mainshaft) speed
sensor defective
Output shaft (countershaft)
speed sensor defective
ATF temperature sensor
defective
Foreign material in separator
plate orifice Check for a stored DTC, and check for loose
connectors.
Inspect the A/T clutch pressure control solenoid
valve filter/gasket and the O-rings for wear and
damage, and inspect the solenoid valves for
seizure.
Check the input shaft (mainshaft) speed sensor
and the output shaft (countershaft) speed sensor
installation.
Check for a clogged orifice in the separator plate.
If the orifice is clogged, remove it and clean the
separator plate orifice.
Excessive shock or
flares on 1-2
upshift or 2-1
downshift 1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13. Shift solenoid valve E defective
A/T clutch pressure control
solenoid valve A defective
A/T clutch pressure control
solenoid valve B defective
A/T clutch pressure control
solenoid valve C defective
2nd clutch transmission fluid
pressure switch defective
Foreign material in separator
plate orifice
1st accumulator defective
2nd accumulator defective
1st check ball stuck
2nd check ball stuck
Lock-up shift valve defective
1st clutch defective
2nd clutch defective Check for a stored DTC, and check for loose
connectors.
Inspect shift solenoid valve E for seizure, and the
O-rings for wear and damage.
Inspect the A/T clutch pressure control solenoid
valve filter/gasket and the O-rings for wear and
damage, and inspect the solenoid valves for
seizure.
Check the 1st and the 2nd clutch pressures.
Check for a clogged orifice in the separator plate.
If the orifice is clogged, remove it and clean the
separator plate orifice.
Inspect the clutch piston, the clutch piston check
valve, and the O-rings. Check the spring retainer
and the retainer seal for wear, damage, and
peeling. Inspect the clearance between the clutch
end-plate and the top disc. If the clearance is out
of tolerance, inspect the clutch discs and the
plates for wear and damage. If the discs are worn
or damaged, replace them as a set. Inspect the
clutch wave-plate height. If the height is out of
tolerance, replace the wave-plate. If the discs and
the plates are OK, adjust the clearance with the
clutch end-plate.
Check the lock-up shift valve in the regulator
valve body for free movement, and check the
lock-up shift valve spring for wear and damage.
Inspect the 1st clutch feed pipe. If the 1st clutch
feed pipe is scored, replace the end cover.
Replace the secondary shaft if the bushing for the
1st clutch feed pipe is loose or damaged.
Check the 1st accumulator piston, the O-ring, and
the springs in the regulator valve body for wear
and damage.
Check the 2nd accumulator piston, the O-ring,
and the springs in the servo valve body for wear
and damage.
08/08/21 14:37:10 61SNR030_140_0022
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SymptomProbable cause(s) Notes
14-25
















Torque converter
clutch does not
operate smoothly
1.
2.
3.
4.
5.
6.Shift solenoid valve E defective
A/T clutch pressure control
solenoid valve A defective
Torque converter clutch piston
defective
Torque converter check valve
defective
Lock-up shift valve defective
Lock-up control valve defective Check for a stored DTC, and check for loose
connectors.
Inspect shift solenoid valve E for seizure, and the
O-rings for wear and damage.
Inspect the A/T clutch pressure control solenoid
valve filter/gasket and the O-rings for wear and
damage, and inspect the solenoid valves for
seizure.
Replace the torque converter.
Check the lock-up control valve in the main valve
body for free movement, and check the lock-up
control valve spring for wear and damage.
Check the lock-up shift valve in the regulator
valve body for free movement, and check the
lock-up shift valve spring for wear and damage.
Torque converter
clutch does not
engage 1.
2.
3.
4.
5.
6.
7.
8.Shift solenoid valve E defective
A/T clutch pressure control
solenoid valve A defective
Input shaft (mainshaft) speed
sensor defective
Output shaft (countershaft) speed
sensor defective
Torque converter clutch piston
defective
Torque converter check valve
defective
Lock-up shift valve defective
Lock-up control valve defective Check for a stored DTC, and check for loose
connectors.
Inspect shift solenoid valve E for seizure, and the
O-rings for wear and damage.
Inspect the A/T clutch pressure control solenoid
valve filter/gasket and the O-rings for wear and
damage, and inspect the solenoid valves for
seizure.
Replace the torque converter.
Check the input shaft (mainshaft) speed sensor
and the output shaft (countershaft) speed sensor
installation.
Check the lock-up control valve in the main valve
body for free movement, and check the lock-up
control valve spring for wear and damage.
Check the lock-up shift valve in the regulator
valve body for free movement, and check the
lock-up shift valve spring for wear and damage.
A/T gear position
indicator does not
indicate shift lever
positions 1.
2.
3.Transmission range switch
defective or out of adjustment
Shift cable broken or out of
adjustment
Connection between the shift
cable and transmission or body is
worn Check for a stored DTC, and check for loose
connectors.
Inspect the transmission range switch operation.
Check for a loose shift cable at the shift lever and
the selector control lever.
(cont’d)
08/08/21 14:37:11 61SNR030_140_0027
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SymptomProbable cause(s) Notes
14-26Automatic Transmission
Symptom Troubleshooting Index (cont’d)



Speedometer and
odometer do not
work
Output shaft (countershaft) speed
sensor defective
Check for a stored DTC, and check for loose
connectors.
Inspect the transmission range switch operation.
Check the output shaft (countershaft) speed
sensor installation.
Engine does not
revtohighrpm,
and the
transmission
upshifts at low rpm
(engine at normal
operating
temperature) VTEC rocker arms defective Check the engine rocker arms.
08/08/21 14:37:11 61SNR030_140_0028
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Î
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14-27
Component Location Index
PADDLE SHIFTER
(DOWNSHIFT SWITCH)PADDLE SHIFTER
(UPSHIFT SWITCH)
SHIFT LOCK SOLENOID
DATA LINK CONNECTOR (DLC) PARK PIN SWITCH
OUTPUT SHAFT
(COUNTERSHAFT)
SPEED SENSOR
TRANSMISSION
RANGE SWITCH
INPUTSHAFT(MAINSHAFT)
SPEED SENSOR
A/T CLUTCH PRESSURE
CONTROL SOLENOID VALVE C ATF TEMPERATURE
SENSOR
(Behind shift
solenoid valve cover)
SHIFT SOLENOID VALVE C
(Behind shift
solenoid valve cover) SHIFT SOLENOID
VALVE B
(Behind shift
solenoid valve cover)
SHIFT SOLENOID
VALVE A
(Behind shift
solenoid valve cover)
2ND CLUTCH
TRANSMISSION FLUID
PRESSURE SWITCH POWERTRAIN CONTROL
MODULE (PCM)
A/T CLUTCH PRESSURE
CONTROL SOLENOID VALVE B A/T CLUTCH PRESSURE
CONTROL SOLENOID VALVE A
SHIFT SOLENOID VALVE D
(Behind shift
solenoid valve cover)
SHIFT SOLENOID VALVE E
(Behind shift
solenoid valve cover) 3RD CLUTCH
TRANSMISSION FLUID
PRESSURE SWITCH
Replacement,
page 14-227 Replacement, page 14-227
Test, page 14-224
Replacement, page 14-226
Test/Replacement,page 14-229
Test, page 14-215
Replacement,
page 14-217 Test, page 14-215
Replacement,
page 14-217
Test, page 14-215
Replacement, page 14-217
Replacement, page 14-228
Test, page 14-222
Replacement,page 14-226 Test, page 14-219
Replacement, page 14-221
Test, page 14-215
Replacement, page 14-217
Test, page 14-215
Replacement, page 14-217 Replacement,
page 14-228
08/08/21 14:37:16 61SNR030_140_0029
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General Operation
Torque Converter, Gears, and Clutches
Electronic Control
Hydraulic Control
Shift Control Mechanism
Lock-up Mechanism
14-28Automatic Transmission
System Description
The automatic transmission is a combination of a three-element torque converter and triple-shaft electronically
controlled unit which provides five speeds forward and one in reverse. The entire unit is positioned in line with the
engine.
The torque converter consists of a pump, turbine, and stator assembly in a single unit. The converter housing (pump)
is connected to the engine crankshaft and turns as the engine turns. Around the outside of the torque converter is a
ring gear which meshes with the starter drive gear when the engine is being started. The entire torque converter
assembly serves as a flywheel while transmitting power to the transmission mainshaft. The transmission has three
parallel shafts; the mainshaft, the countershaft, and the secondary shaft. The mainshaft is in line with the engine
crankshaft, and includes the 4th and 5th clutches, and gears for 5th, 4th, reverse, and idler. The mainshaft reverse gear
is integral with the mainshaft 4th gear. The countershaft includes the gears for 1st, 2nd, 3rd, 4th, 5th, reverse, park,
and the final drive. The final drive gear is integral with the countershaft. The countershaft 4th gear and the
countershaft r
everse gear can be locked to the countershaft providing 4th or r everse gear, depending on which way
the selector is moved. The secondary shaft includes the 1st, 2nd, and 3rd clutches, and gears for 1st, 2nd, 3rd, and
idler. The idler gear shaft is located between the mainshaft and the secondary shaft, and the idler gear transmits
power between the mainshaft and the secondary shaft. The gears on the mainshaft and the secondary shaft are in
constant mesh with those on the countershaft. When certain combinations of gears in the transmission are engaged
by the clutches, power is transmitted through the mainshaft, then to the secondary shaft to the countershaft, or
through the mainshaft to the countershaft to provide drive.
The electronic control system consists of the powertrain control module (PCM), sensors, and shift solenoid valves.
Shifting and lock-up are electronically controlled for comfortable driving under all conditions. The PCM is located in
the engine compartment.
The valve bodies include the main valve body, the regulator valve body, and the servo body. They are bolted to the
torque converter housing. The main valve body contains the manual valve, shift valves A, B, C, and E, the relief valve,
the lock-up control valve, the cooler check valve, the servo control valve, and the ATF pump gears. The regulator valve
body contains the regulator valve, the torque converter check valve, the lock-up shift valve, and the 1st and 3rd
accumulators. The servo body contains the servo valve, shift valve D, the accumulators for 2nd, 4th, and 5th, and shift
solenoid valves A, B, C, D, and E. Fluid from the regulator passes through the manual valve to the various control
valves. The 1st, 3rd, and 5th clutches receive fluid from their respective feed pipes, and the 2nd and 4th clutches
receive fluid from the internal hydraulic circuit.
To shift gears, the PCM controls shift solenoid valves A, B, C, D, and E, and A/T clutch pressure control solenoid valves
A, B, and C, while receiving input signals from various sensors and switches located throughout the vehicle. The shift
solenoid valves shift the positions of the shift valves to switch the port leading hydraulic pressure to the clutch. A/T
clutch pressure control solenoid valves A, B, and C regulate their respective pressure, and pressurize the clutches to
engage them and their corresponding gears. The pressure of the A/T clutch pressure control solenoid valves also
applies to the shift valves to switch the port.
The lock-up mechanism operates in D (2nd, 3rd, 4th, and 5th gears). The pressurized fluid is drained from the back of
the torque converter through a fluid passage, causing the torque converter clutch piston to be held against the torque
converter cover. As this takes place, the mainshaft rotates at the same speed as the engine crankshaft. Together with
the hydraulic control, the PCM optimizes the timing and volume of the lock-up mechanism. When shift solenoid valve
E is turned on by the PCM, shift solenoid valve E pressure switches the lock-up shift valve on and off. A/T clutch
pressure control solenoid valve A and the lock-up control valve control the degree of lock-up.
08/08/21 14:37:16 61SNR030_140_0030
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´µ
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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