Nissan Tiida C11. Manual - part 1244

A/T CONTROL SYSTEM

TM-27

< FUNCTION DIAGNOSIS >

[TYPE 1 (4AT: RE4F03B)]

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OVERRUN CLUTCH OPERATING CONDITIONS

OVERRUN CLUTCH SOLENOID VALVE CONTROL

The overrun clutch solenoid valve is operated by an ON-OFF signal
transmitted by the TCM to provide overrun clutch control (engine
brake control).
When this solenoid valve is “ON”, the pilot pressure drain port
closes. When it is “OFF”, the drain port opens.
During the solenoid valve “ON” pilot pressure is applied to the end
face of the overrun clutch control valve.

OVERRUN CLUTCH CONTROL VALVE OPERATION

When the solenoid valve is “ON”, pilot pressure is applied to the
overrun clutch control valve. This pushes up the overrun clutch con-
trol valve. The line pressure is then shut off so that the clutch does
not engage. Only in “1” position, however, 1 range pressure is
applied to overrun clutch control valve, resulting in valve moving
downward and clutch engaged.
When the solenoid valve is “OFF”, pilot pressure is not generated. At
this point, the overrun clutch control valve moves downward by
spring force. As a result, overrun clutch operation pressure is pro-
vided by the overrun clutch reducing valve. At overrun clutch reduc-
ing valve in “D” position, the hydraulic pressure is reduced to a level
that balances the spring force. This is sent to overrun clutch control
valve and becomes the operating pressure of overrun clutch which is
engaged at all times. In “2” position and “1” position, overrun clutch
reducing valve is pushed down by 2 range pressure. Line pressure is
directly sent to overrun clutch control valve and becomes the operat-
ing pressure of overrun clutch which is engaged at all times.

SCIA7186E

SAT015J

SCIA7172E

TM-28

< FUNCTION DIAGNOSIS >

[TYPE 1 (4AT: RE4F03B)]

A/T CONTROL SYSTEM

Control Valve

INFOID:0000000001694429

FUNCTION OF CONTROL VALVES

Centrifugal Cancel Mechanism

INFOID:0000000001694419

FUNCTION

The centrifugal cancel mechanism is a mechanism to cancel the centrifugal hydraulic pressure instead of the
conventional check balls. It cancels the centrifugal hydraulic pressure which is generated as high clutch drum
rotates, and it allows for preventing high clutch from dragging and for providing stable high clutch piston press-
ing force in all revolution speeds.

STRUCTURE/OPERATION

Valve name

Function

Pressure regulator valve, plug and sleeve 
plug

Regulates oil discharged from the oil pump to provide optimum line pressure for all driving 
conditions.

Pressure modifier valve and sleeve

Used as a signal supplementary valve to the pressure regulator valve. Regulates pres-
sure-modifier pressure (signal pressure) which controls optimum line pressure for all driv-
ing conditions.

Pilot valve

Regulates line pressure to maintain a constant pilot pressure level which controls lock-up 
mechanism, overrun clutch, shift timing.

Accumulator control valve

Regulates accumulator back-pressure to pressure suited to driving conditions.

Manual valve 

Directs line pressure to oil circuits corresponding to select positions.
Hydraulic pressure drains when the shift lever is in Neutral.

Shift valve A

Simultaneously switches three oil circuits using output pressure of shift solenoid valve A 
to meet driving conditions (vehicle speed, throttle opening, etc.).
Provides automatic downshifting and upshifting (1st 

→

 2nd 

→

 3rd 

→

 4th gears/4th 

→

 3rd 

→

 2nd 

→

 1st gears) in combination with shift valve B.

Shift valve B

Simultaneously switches two oil circuits using output pressure of shift solenoid valve B in 
relation to driving conditions (vehicle speed, throttle opening, etc.).
Provides automatic downshifting and upshifting (1st 

→

 2nd 

→

 3rd 

→

 4th gears/4th 

→

 3rd 

→

 2nd 

→

 1st gears) in combination with shift valve A.

Overrun clutch control valve

Switches hydraulic circuits to prevent engagement of the overrun clutch simultaneously 
with application of the brake band in D

4

. (Interlocking occurs if the overrun clutch engages 

during D

4

.)

1st reducing valve

Reduces low & reverse brake pressure to dampen engine-brake shock when downshift-
ing from the 1st position 1

2

 to 1

1

.

Overrun clutch reducing valve 

Reduces oil pressure directed to the overrun clutch and prevents engine-brake shock.
In the 1st and 2nd positions, line pressure acts on the overrun clutch reducing valve to 
increase the pressure-regulating point, with resultant engine brake capability.

Torque converter relief valve

Prevents an excessive rise in torque converter pressure.

Torque converter clutch control valve, plug 
and sleeve

Activates or inactivates the lock-up function.
Also provides smooth lock-up through transient application and release of the lock-up 
system.

1-2 accumulator valve and piston

Lessens the shock find when the 2nd gear band servo contracts, and provides smooth 
shifting.

3-2 timing valve

Switches the pace that oil pressure is released depending on vehicle speed; maximizes 
the high clutch release timing, and allows for soft downshifting.

Shuttle valve

Determines if the overrun clutch solenoid valve should control the 3-2 timing valve or the 
overrun clutch control valve and switches between the two.

Cooler check valve

At low speeds and with a small load when a little heat is generated, saves the volume of 
cooler flow, and stores the oil pressure for lock-up.

A/T CONTROL SYSTEM

TM-29

< FUNCTION DIAGNOSIS >

[TYPE 1 (4AT: RE4F03B)]

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A centrifugal cancel housing is provided to cancel the clutch housing pressure. The centrifugal cancel housing
is always filled with ATF from the dedicated fluid passage of oil pump.

When Clutch Pressure Is Not Applied

As high clutch drum rotates, a centrifugal force applies to the remaining ATF in clutch housing to push high
clutch piston. However, on the other hand, the centrifugal force also applies to ATF filled in centrifugal cancel
housing, resulting in a force that pushes high clutch piston back. Consequently the high clutch piston does not
move because both forces cancel each other, and thus high clutch is prevented from dragging.

When Clutch Pressure Is Applied

Clutch pressure that applies to clutch housing overcomes the fluid pressure and spring force of the opposing
centrifugal housing to push high clutch piston, and high clutch is engaged. At this time, the centrifugal force
caused by the revolution speed of high clutch drum has no impact any more since the centrifugal force that
applies to the clutch pressure of clutch housing is canceled by the centrifugal force that applies to centrifugal
cancel housing. As a result, high clutch piston pressing force is always stable in all revolution speeds, and
thus smooth shifting characteristics are achieved.

SCIA6832E

SCIA6833E

TM-30

< FUNCTION DIAGNOSIS >

[TYPE 1 (4AT: RE4F03B)]

A/T CONTROL SYSTEM

Component Parts Location

INFOID:0000000001694446

1.

OD OFF indicator lamp

2.

Shift position indicator

3.

Accelerator pedal position (APP)

4.

Turbine revolution sensor (Power 
train revolution sensor)

5.

PNP switch

6.

Terminal body (Terminal cord assem-
bly connector)

7.

Revolution sensor 

8.

Dropping resistor

9.

TCM (LHD)

10.

TCM (RHD) 

11.

Overdrive control switch

AWDIA0072ZZ