Mazda Automatic Transaxle JA5A-EL. Manual - part 19

AUTOMATIC TRANSAXLE 

K–57

K

AMU0517A562

K–58

AUTOMATIC TRANSAXLE 

Second Gear (D, S, L range)

Outline

• Since only shift solenoid C turns OFF when shifting from first gear, the hydraulic circuit for the 2-4 brake opens 

to engage the low clutch and 2-4 brake.

• In second gear, as in first, the rear sun gear is the input of driving force transmission and the rear carrier is the 

output.

• The difference between first and second gear is that the rear internal gear, fixed in first gear, starts to rotate 

counterclockwise as the front sun gear rotating freely and clockwise in first gear is fixed by engagement of the 

2-4 brake.

AMU0517A563

AUTOMATIC TRANSAXLE 

K–59

K

Operation

• When in first gear, the front internal gear integrated with rear planetary carrier rotates counterclockwise, and 

the front planetary carrier is fixed by the force of the low one-way clutch via low clutch drum.

• In this condition, the front sun gear was rotates clockwise with no load. When the 2-4 brake is engaged in 

second gear, the front sun gear is fixed and the front pinion starts to revolve counterclockwise while rotating 

counterclockwise due to the movement of the front internal gear.

• Therefore, the front planetary carrier starts to rotate counterclockwise. At this time, the low and one-way clutch 

(low clutch drum) is unlocked to rotate counterclockwise.

• The rear internal gear, integrated with the front planetary carrier, also starts to rotate counterclockwise. Due to 

this, the counterclockwise revolving speed of the rear pinion increases and the force is transmitted to the rear 

planetary carrier.

• The increased speed amount of the rear planetary carrier is the amount of gear ratio change between the first 

and second gear.

• The driving force transmission to the reduction gear is the same as that in first gear. As the operation of the 

reduction gear during deceleration is also the same as that in first gear and engine braking is not applied, the 

description is omitted.

K–60

AUTOMATIC TRANSAXLE 

AMU0517A564