2002 MAZDA 6 Workshop Manual Suplement

K2–42
AUTOMATIC TRANSAXLE
CENTRIFUGAL BALANCE CLUTCH DESCRIPTIONA6E571401030208Function
•The centrifugal balance clutch, which replaces the conventional piston check ball, cancels centrifugal oil
pressure generated during clutch drum rotation to prevent the clutch drag-engagement and to stabilize piston
pressure during full rotation.
Construction/Operation
•Centrifugal balance clutch chambers are installed opposite the clutch chambers in the low and high clutches.
The centrifugal balance clutch chambers are constantly filled with ATF from the exclusive hydraulic passage of
the oil pump.
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AUTOMATIC TRANSAXLE
K2–43
K2
When the clutch pressure is not applied
•When the clutch drum rotates, centrifugal force acts on the residual ATF in the clutch chamber to push against
the piston. However, centrifugal force also acts on the ATF filled in the centrifugal balance clutch chamber to
push back the piston. As a result, the two forces are eliminated and the piston remains stationary, thus
preventing clutch engagement.
When the clutch pressure is applied
•When clutch pressure is applied to the clutch chamber, the clutch pressure overcomes the oil pressure and the
spring force in the opposite centrifugal balance clutch chamber, and pushes the piston to engage the clutches.
Because the centrifugal force acting on the clutch pressure in the clutch chamber is canceled by another
centrifugal force acting on the ATF filled in the centrifugal balance clutch chamber, the influence of the
centrifugal force created by the clutch drum revolution speed is eliminated. As a result, stable piston pushing
force is obtained in all rotation ranges, and smoother shifts can be made.
End Of SieCONTROL VALVE BODY DESCRIPTIONA6E571421100201Outline
•The control valve body is composed of four bodies: the sub lower body, lower body, internal body, and the upper
body.
•To minimize the component in the control valve body, clutch engagement is electronically controlled, hydraulic
circuits were simplified and the valve types reduced.
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K2–44
AUTOMATIC TRANSAXLE
End Of Sie
AMU0517S064

AUTOMATIC TRANSAXLE
K2–45
K2
TRANSAXLE FLUID TEMPERATURE (TFT) SENSOR DESCRIPTIONA6E571419010201•The TFT sensor, which is installed in the transaxle case, detects the ATF temperature in the transaxle case,
and sends the control signal to the TCM. The TCM controls the driving pattern and the torque converter clutch
based on the signal from the TFT sensor.
Structure/Operation
•The TFT sensor is a thermistor type and the resistance changes according to the ATF temperature.
•The characteristic of the resistance is as shown in the figure below.
•The TFT sensor is integrated with the connector.
End Of SieINPUT/TURBINE SPEED SENSOR DESCRIPTIONA6E571421550201Function
• A input/turbine speed sensor is located in the transaxle case and detects the rotating speed of the reverse
clutch drum.
Construction/Operation
•The magnetic pickup type of input/turbine speed sensor is mounted in the transaxle case, next to the reverse
clutch drum. It generates a 36-pulse signal for each rotation of the reverse clutch drum, and sends this signal to
the TCM.
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AMU0517S021

K2–46
AUTOMATIC TRANSAXLE
INTERMEDIATE SENSOR DESCRIPTIONA6E571419550201Function
• A intermediate sensor is located in the transaxle case and detects the rotating speed of the output gear.
Construction/Operation
•The magnetic pickup type of intermediate sensor is mounted in the transaxle case, next to the output gear. It
generates a 54-pulse signal for each rotation of the output gear, and sends this signal to the TCM.
End Of SieVEHICLE SPEEDOMETER SENSOR DESCRIPTIONA6E571417400201Function
• A vehicle speedometer sensor is located in the transaxle case and detects the rotating speed of the parking
gear.
Construction/Operation
•The magnetic pickup type of vehicle speedometer sensor is mounted in the transaxle case, next to the parking
gear. It generates a 18-pulse signal for each rotation of the parking gear, and sends this signal to the TCM.
End Of Sie
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AUTOMATIC TRANSAXLE
K2–47
K2
SOLENOID VALVE DESCRIPTIONA6E571421280201Function
AMU0517S024

K2–48
AUTOMATIC TRANSAXLE
Function chart
Construction/Operation
Duty type
Normal high
•De-energized (OFF) or duty 0%
—Because the output port (solenoid pressure) and supply port (pilot pressure) connect in the solenoid, the
solenoid pressure supplied to the output port.
•Energized (ON) or duty 100%
—Because the output port (solenoid pressure) and the drain port connect, solenoid pressure is drained.
Normal low
•De-energized (OFF) or duty 0%
—Because the output port (solenoid pressure) and the drain port connect in the solenoid, the solenoid
pressure is drained.
•Energized (ON) or duty 100%
—Because the output port (solenoid pressure) and the supply port (pilot pressure) connect in the solenoid,
the solenoid pressure supplied to the output port.
Solenoid Type Characteristics Function
Pressure control solenoid
Repeats ON and OFF at 50
Hz (20 ms cycle); duty cycle
type (three-way type)Normal highControls pressure regulator
valve, regulates line pressure
Torque converter clutch
(TCC) solenoid valveNormal lowControls TCC engagement
and disengagement
2-4 brake solenoid valve
Normal highControl 2-4 brake
engagement and
disengagement
High clutch solenoid valveControl high clutch
engagement and
disengagement
Shift solenoid A
ON/OFF (three-way type)
Normal lowControl shift valve A
Shift solenoid BControl shift valve B
Shift solenoid CControl shift valve C
Reduction timing solenoid
valve
ON/OFF (two-way type)Control reduction reducing
valve
Neutral shift solenoidControl neutral shift valve and
reverse inhibitor valve
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AUTOMATIC TRANSAXLE
K2–49
K2
ON/OFF type (two-way)
Normal low
•De-energized (OFF)
—The TCM does not apply an electric current to the solenoid valves. The rod moves upward by hydraulic
pressure and the drain port opens.
•Energized (ON)
—The TCM applies an electric current to the solenoid valves. This excites the coil and forces the rod to move
downward to retain hydraulic pressure.
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