Mazda Automatic Transaxle JA5A-EL. Manual — part 10

AUTOMATIC TRANSAXLE

K–21

K

OIL PUMP DESCRIPTION

AME561419220A01

Outline

• The light-weight, compact, and quiet trochoid type oil pump reduces pump driving torque.

• The direct drive type oil pump is placed behind the torque converter.

Structure/Operation

• The outer rotor and inner rotor are installed in the oil pump housing.

• The inner rotor in the oil pump housing is driven by the torque converter.

• When the inner rotor in the oil pump rotates, the ATF is drawn to the oil pump. The discharge amount is

proportional to the rotating speed of the torque converter.

AMU0517A518

AMU0517A519

K–22

AUTOMATIC TRANSAXLE

End Of Sie

CONTROL VALVE DESCRIPTION

AME561421100A01

Outline

• 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.

AUTOMATIC TRANSAXLE

K–23

K

Control Valve Component Location

AMU0517A521

K–24

AUTOMATIC TRANSAXLE

Control Valve Component Description

Component

Function

Pressure regulator valve

• Reduces oil pump discharge pressure according to

pressure modifier pressure and adjusts it to line pressure.

Pressure modifier valve

• Reduces pilot pressure according to throttle pressure and

adjusts it to pressure modifier pressure.

Pilot valve

• Reduces line pressure and adjusts to it pilot pressure.

Accumulator control valve A

• Reduces line pressure according to discharge pressure

from pressure control solenoid and adjusts it to

accumulator control pressure.

Accumulator control valve B

• Reduces line pressure according to discharge pressure

from 2-4 brake solenoid and adjusts it to accumulator

control pressure.

Accumulator control valve C

• Reduces line pressure according to discharge pressure

from high clutch solenoid and adjusts it to accumulator

control pressure.

Torque converter pressure regulator valve

• Reduces line pressure and adjusts supply pressure to

torque converter.

Neutral control valve

• Adjusts low clutch operation pressure according to the

output pressure from pressure control solenoid. This

pressure is not supplied to low clutch when neutral shift

valve is not switched.

Reduction reducing valve

• When reduction timing valve is not switched, reduces line

pressure according to discharge pressure from

accumulator control valve B and adjusts it to reduction

reducing pressure.

Line pressure relief valve

• When line pressure exceeds specified level, this valve

opens to reduce the line pressure.

Torque converter clutch control valve

• Locks or releases torque converter clutch according to the

discharge pressure of torque converter clutch solenoid

valve. Reduces shift shock by gradually changing line

pressure during locking and releasing.

Shift valve A

• Switches hydraulic circuits according to the operation of

shift solenoid and enables shifting from first to fifth gear by

arrangement of shift valves A to C.

Shift valve B
Shift valve C
Accumulator switch valve

• Since high clutch accumulator is common to high clutch

and reverse clutch, switches circuits regardless of line

pressure supply from manual valve.

Reverse inhibit valve

• When vehicle is in forward motion and mistakenly shifted

into R, it shifts to N position by switching low and reverse

brake circuits and producing neutral condition.

Neutral shift valve

• Switches hydraulic circuits of low clutch pressure to

pressure adjusted by neutral control valve or line pressure,

according to the operation of neutral shift solenoid.

Manual valve

• Distributes line pressure to each control valve according to

gear selector position.

Fail-safe valve

• A locked valve that only forms hydraulic circuits but has no

function.

Reduction timing valve

• Switches timing of reduction brake operation when shifting

selector lever to force engine braking. Operates by

switching of reduction timing solenoid.

Low clutch accumulator

• Locks or releases low clutch with optimum timing to reduce

shift shock.

High clutch accumulator

• Locks or releases high clutch with optimum timing to

reduce shift shock.

Modifier accumulator

• Reduces pulsation of pressure modifier pressure.

Throttle accumulator A

• Reduces pulsation of throttle pressure.

Throttle accumulator B

• Reduces pulsation of control pressure to accumulator

control valve B.

Throttle accumulator C

• Reduces pulsation of control pressure to accumulator

control valve C.