Mazda 5. Manual - part 22

05–17–8

AUTOMATIC TRANSAXLE 

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TORQUE CONVERTER STRUCTURE

B3E051719100A02

• The torque converter with the TCC control consists of the turbine runner, pump impeller, stator, and the TCC 

piston as shown in the figure. The TCC piston engages with the turbine runner and slides on the turbine hub to 
be pushed and contacts with the torque converter cover during the TCC control operation. In the TCC piston, a 

B3E0517A014

AUTOMATIC TRANSAXLE 

05–17–9

05

spring for torsion damper is installed to absorb the engine torque fluctuation during TCC control.

.

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POWER FLOW OUTLINE

B3E051701030A06

• 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.

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POWER FLOW STRUCTURE

B3E051701030A07

• 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.

9

8

7

5

4

3

6

1

2

8

4

3

1

2

3

2

10

B3E0517T014

1

TCC piston

2

Pump impeller

3

Turbine runner

4

Stator

5

Turbine hub

6

One-way clutch

7

Oil cooler

8

Converter cover

9

TCC operation

10

TCC non-operation

05–17–10

AUTOMATIC TRANSAXLE 

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8

7

5

4

3

6

1

2

B3E0517T004

8

7

5

4

3

6

1

2

B3E0517T055

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 

05–17–11

05

POWER FLOW OPERATION

B3E051701030A08

Component description

Note

• All directions of rotation are viewed from the torque converter.

Component

Function

Forward clutch

• Transmits the input torque from the turbine shaft to the front sun gear.

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

3-4 clutch

• Transmits the input torque from the turbine shaft to the rear planetary 

carrier.

• Operates in the forward range of the third or fourth gear position.

Reverse clutch

• Transmits the input torque from the turbine shaft to the rear sun gear.

• Operates when the vehicle is backing up.

2-4 brake band

• Locks rotation of the reverse drum and fixes the rear sun gear.

• Operates in the second or fourth gear position.

Low and reverse brake

• Fixes the rotation of the front internal gear.

• Operates when the vehicle is backing up or in the first gear position (L range 

HOLD and M range).

One-way clutch

• Locks the counterclockwise rotation of the front internal gear in the 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.