Mazda 626 Station Wagon, Workshop Manual

Page: 212 / 577

AUTOMATIC TRANSAXLE
OUTLINE OF OPERATION
• The operation of the electronic automatic transaxle is classified into three systems: the electronic control
mechanism, the hydraulic pressure control mechanism, and the powertrain mechanism (includes the torque
converter mechanism). The operation of each system is as follows:
— Electronic control mechanism
• According to the signals from the switches and sensors in the input system, the PCM outputs the
signal which matches the present driving condition to the linear type solenoid, ON/OFF type solenoids
and the duty-cycle type solenoids in the hydraulic pressure control mechanism.
— Hydraulic pressure control mechanism
• According to the signals from the PCM, each solenoid operates to switch the hydraulic passages in the
control valve body and controls the clutch engagement pressure.
• The line pressure is adjusted by the linear type pressure control solenoid. The hydraulic passages are
switched by the ON/OFF type solenoids (shift solenoids D and E.) And the clutch engagement
pressure is controlled by the duty-cycle type solenoids (shift solenoids A, B, and C).
— Powertrain mechanism
• The driving force from the engine is transmitted through the torque converter to the transaxle.
• The transmitted driving force operates each clutch and brake according to the clutch engagement
pressure from the duty-cycle type solenoid, and the planetary gears change the gear ratio to the
optimal driving force. The changed driving force is transmitted through the differential to the axle shaft
and then the tires.
©
© ©
©
©
r ~
© -
■ i
H t © t
r f f l
t
P§r
]
„
© dD <E!>
@>
1
Powertrain mechanism
2
Hydraulic pressure control mechanism
3
Electronic control mechanism
4 Torque converter
5 Clutches, brakes
6
Planetary gear
7 Differential
8
Control valve body
'9 Shift solenoid D, E (ON/OFF type)
f io
Pressure control solenoid (linear type)
11
Shift solenoid A, B, C (duty-cycle type)
12
Oil pump
13 PCM
14 Vehicle speed
15 ATF temperature
16 Forward clutch drum revolution speed
17 Engine revolution speed
18 Clutches, brakes engagement, relase pressure
19 Powerflow
20
Hydraulic pressure control signal
21
Electronic signal
22
Tire
K 2-5