Mazda 6. Manual - part 34

AUTOMATIC TRANSAXLE 

K–7

K

EC-AT OPERATION CHART

A6E561401030T04

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A6E5614T003

K–8

AUTOMATIC TRANSAXLE 

POWERFLOW

A6E561401030T05

Outline

•

In the powertrain mechanism, hydraulic pressure is transported from the control valves or shift solenoid A, B, or 
C (duty cycle type) to operate the clutches and brakes, and the planetary gear changes the gear ratio 
according to the vehicle driving condition.

Structure

•

The powertrain mechanism of the FN4A-EL type consists of three pairs of clutches, brake, band brake, one-
way clutch, and two pairs of single type planetary gears.

.

A6E5614T004

A6E5614T005

1

Forward clutch

2

One-way clutch

3

Low and reverse brake

4

Front planetary gear

5

Rear planetary gear

6

2-4 brake band

7

Reverse clutch

8

3-4  clutch

AUTOMATIC TRANSAXLE, ELECTRONIC CONTROL SYSTEM 

K–9

K

Operation
Component description

Note

•

All directions of rotation are viewed from the torque converter.

End Of Sie

OUTLINE

A6E561501030T01

•

The PCM, which is integrated with the PCM for engine control, is adopted for transaxle control. The PCM 
outputs the control signal to the engine and the transaxle according to the signal from each sensor and/or 
switch.

•

Due to the adoption of the line pressure adjusting control by the linear type pressure control solenoid and the 
clutch engaging pressure control by duty-cycle type shift solenoids A, B, and C, excellent shift quality is 
obtained.

End Of Sie

Component

Function

Forward clutch

•

Transmits input torque from turbine shaft to  front sun gear

•

Operates in forward range of first, second, or third gear position

3-4 clutch

•

Transmits input torque from turbine shaft to rear planetary carrier

•

Operates in forward range of third or fourth gear position

Reverse clutch

•

Transmits input torque from turbine shaft to rear sun gear

•

Operates when vehicle is backing

2-4 brake band

•

Locks rotation of reverse drum, and fixes rear sun gear

•

Operates in second or fourth gear position

Low and reverse brake

•

Fixes rotation of front internal gear

•

Operates when vehicle is backing or in first gear position (L range, HOLD)

One-way clutch

•

Locks counterclockwise rotation of front internal gear in first gear position

Planetary gear

•

The planetary gear functions as a transmission due to the engagement/ 
disengagement of clutches and/or brakes, converts the transmitted driving 
force of the turbine shaft and transmits it to the output gear.

ELECTRONIC CONTROL SYSTEM

K–10

ELECTRONIC CONTROL SYSTEM 

CONSTRUCTION

A6E561501030T02

.

A6E5614T007

1

HOLD indicator light

2

Speedometer

3

Brake switch

4

PCM

5

HOLD switch

6

Throttle position sensor

7

DLC

8

Mass air flow sensor

9

Engine coolant temperature sensor

10

Vehicle speed sensor

11

Input /turbine speed sensor

12

Crankshaft position sensor

13

Control valve (With transaxle fluid temperature 
sensor and solenoid valves)

14

Transaxle range swich

15

Oil pressure switch