oil level NISSAN LATIO 2009 Service Repair Manual

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Control Valve
INFOID:0000000004305307
FUNCTION OF CONTROL VALVES
Centrifugal Cancel Mechanism INFOID:0000000004305308
FUNCTION The centrifugal cancel mechanism is a mechanism to c ancel the centrifugal hydraulic pressure instead of the
conventional check balls. It cancels the centrifugal hy draulic 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 D4. (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 12 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.

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Inspections Before Trouble Diagnosis
INFOID:0000000004305319
A/T FLUID CHECK
Fluid Leakage and Fluid Level Check Check fluid leakage and check the fluid level. Refer to AT-17, " Checking A/T Fluid " .
Fluid Condition Check Check the A/T fluid condition.
STALL TEST
Stall Test Procedure 1. Check ATF and engine oil levels. If necessary, add ATF and engine oil.
2. Drive vehicle for approximately 10 minutes or until ATF and engine oil reach operating temperature.
3. Set parking brake and block wheels.
4. Install a tachometer where it can be seen by driver during test. •It is good practice to mark the point of specified engine
rpm on indicator.
5. Start engine, apply foot brake, and place selector lever in “D” position.Fluid status Conceivable Cause Required Operation
Varnished (viscous
varnish state) Clutch, brake
scorched Replace the ATF and check the A/T
main unit and the vehicle for mal-
functions (wire harnesses, cooler
pipes, etc.)
Milky white or
cloudy Water in the ATFReplace the ATF and check for plac-
es where water is getting in.
Large amount of
metal powder mixed
in Unusual wear of
sliding parts within
A/T Replace the ATF and check for im-
proper operation of the A/T. SAT775B

AT-54< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Location of line pressure test ports are shown in the figure.
• Always replace pressure plugs as they are self-sealing bolts.
Line Pressure Test Procedure
1. Check ATF and engine oil levels. If necessary, add ATF or engine oil.
2. Drive vehicle for approx. 10 minutes or until engine oil and ATF reach operating temperature.
3. Install oil pressure gauge to corresponding line pressure test port.
4. Set parking brake and block wheels.
5. Start engine and measure line pressure at idle and stall speed. CAUTION:
• Keep the brake pedal pressed all the way down during
measurement.
• When measuring the line pressure at the stall speed, refer to "STALL TEST". SCIA7187E
ATF operating temperature: 50 - 80
°C (122 -176 °F) SAT647B
SCIA6528J
SAT513G
SAT493G

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Slips/Will Not Engage
Vehicle will not run in
“R” position (but runs
in “D”, “2” and “1” po-
sitions). Clutch slips.
Very poor accelera-
tion. ON vehicle
1. Control cable adjustment
AT-216 2. Stall test
AT-51 3. Line pressure test
AT-51 4. Line pressure solenoid valve
AT-134 5. Control valve assembly
AT-221 OFF vehicle
6. Reverse clutch
AT-296 7. High clutch
AT-301 8. Forward clutch
AT-306 9. Overrun clutch
AT-306 10. Low & reverse brake
AT-313Vehicle will not run in
“D” and “2” positions
(but runs in “1” and
“R” positions). ON vehicle 1. Control cable adjustment
AT-216OFF vehicle 2. Low one-way clutch
AT-256Vehicle will not run in
“D”, “1”, “2” positions
(but runs in R posi-
tion). Clutch slips.
Very poor accelera-
tion. ON vehicle
1. A/T fluid level
AT-17 2. Stall test
AT-51 3. Line pressure test
AT-51 4. Line pressure solenoid valve
AT-134 5. Control valve assembly
AT-221 6. Accumulator N-D
AT-221 OFF vehicle
7. Reverse clutch
AT-296 8. High clutch
AT-301 9. Forward clutch
AT-306 10. Forward one-way clutch
AT-317 11. Low one-way clutch
AT-256Clutches or brakes
slip somewhat in start-
ing. ON vehicle1. A/T fluid level
AT-17 2. Control cable adjustment
AT-216 3. Accelerator pedal position sensor
EC-412
(HR16DE), EC- 959 (MR Type 1)
or EC-1481 (MR
Type 2)
4. Line pressure test AT-51 5. Line pressure solenoid valve
AT-134 6. Control valve assembly
AT-221 7. Accumulator N-D
AT-221 OFF vehicle
8. Forward clutch
AT-306 9. Reverse clutch
AT-296 10. Low & reverse brake
AT-313 11. Oil pump
AT-277 12. Torque converter
AT-256Items Symptom Condition Diagnostic item Reference page

,
AT-187 ON vehicle
1. A/T fluid level
AT-17 2. Line pressure test
AT-51 3. Control valve assembly
AT-221 OFF vehicle
4. Forward clutch
AT-306 5. Oil pump
AT-277 6. Torque converter
AT-256Almost no shock or
clutches slipping in
change from D 1 to D 2
. ON vehicle1. A/T fluid level
AT-17 2. Accelerator pedal position sensor
EC-412
(HR16DE), EC- 959 (MR Type 1)
or EC-1481 (MR
Type 2)
3. Line pressure test AT-51 4. Accumulator servo release
AT-221 5. Control valve assembly
AT-221 OFF vehicle 6. Brake band
AT-330Almost no shock or
slipping in changing
from D 2 to D 3 . ON vehicle 1. A/T fluid level
AT-17 2. Accelerator pedal position sensor
EC-412
(HR16DE), EC- 959 (MR Type 1)
or EC-1481 (MR
Type 2)
3. Line pressure test AT-51 4. Control valve assembly
AT-221 OFF vehicle
5. High clutch
AT-301 6. Forward clutch
AT-306Almost no shock or
slipping in changing
from D 3 to D 4 . ON vehicle 1. A/T fluid level
AT-17 2. Accelerator pedal position sensor
EC-412
(HR16DE), EC- 959 (MR Type 1)
or EC-1481 (MR
Type 2)
3. Line pressure test AT-51 4. Control valve assembly
AT-221 OFF vehicle 5. Brake band
AT-330Races extremely fast
or slips in changing
from D 4 to D 3 when
depressing accelera-
tor pedal. ON vehicle1. A/T fluid level
AT-17 2. Accelerator pedal position sensor
EC-412
(HR16DE), EC- 959 (MR Type 1)
or EC-1481 (MR
Type 2)
3. Line pressure test AT-51 4. Line pressure solenoid valve
AT-134 5. Shift solenoid valve A
AT-139 6. Control valve assembly
AT-221 OFF vehicle
7. Brake band
AT-330 8. Forward clutch
AT-306Races extremel y
ON hi l 2. Accelerator pedal position sensor
EC-412
(HR16DE), EC- 959 (MR Type 1)
or EC-1481 (MR
Type 2)
Items Symptom Condition Diagnostic item Reference page

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Slips/Will Not Engage
Races extremely fast
or slips in changing
from D 3 to D 2 when
depressing accelera-
tor pedal. ON vehicle1. A/T fluid level
AT-17 2. Accelerator pedal position sensor
EC-412
(HR16DE), EC- 959 (MR Type 1)
or EC-1481 (MR
Type 2)
3. Line pressure test AT-51 4. Line pressure solenoid valve
AT-134 5. Shift solenoid valve B
AT-144 6. Control valve assembly
AT-221 OFF vehicle
7. Brake band
AT-330 8. High clutch
AT-301Races extremely fast
or slips in changing
from D 4 or D 3 to D 1
when depressing ac-
celerator pedal. ON vehicle1. A/T fluid level
AT-17 2. Accelerator pedal position sensor
EC-412
(HR16DE), EC- 959 (MR Type 1)
or EC-1481 (MR
Type 2)
3. Line pressure test AT-51 4. Line pressure solenoid valve
AT-134 5. Shift solenoid valve A
AT-139 6. Shift solenoid valve B
AT-144 7. Control valve assembly
AT-221 OFF vehicle
8. Forward clutch
AT-306 9. Forward one-way clutch
AT-317 10. Low one-way clutch
AT-256Vehicle will not run in
any position. ON vehicle
1. A/T fluid level
AT-17 2. Control cable adjustment
AT-216 3. Line pressure test
AT-51 4. Line pressure solenoid valve
AT-134 OFF vehicle
5. Oil pump
AT-277 6. High clutch
AT-301 7. Brake band
AT-330 8. Low & reverse brake
AT-313 9. Torque converter
AT-256 10. Parking components
AT-236Items Symptom Condition Diagnostic item Reference page

ON vehicle
1. Ignition switch and starter
PG-3 ,
SC-9 2. Control cable adjustment
AT-216 3. PNP switch adjustment
AT-224Engine starts in posi-
tions other than “P”
and “N”. ON vehicle
1. Control cable adjustment
AT-216 2. PNP switch adjustment
AT-224Transaxle noise in“ P”
and “N” positions. ON vehicle1. A/T fluid level
AT-17 2. Line pressure test
AT-51 3. Accelerator pedal position sensor
EC-412
(HR16DE), EC- 959 (MR Type 1)
or EC-1481 (MR
Type 2)
4. Vehicle speed sensor·A/T (Revolution sensor)
and vehicle speed sensor·MTR AT-101 ,
AT-154 OFF vehicle
5. Oil pump
AT-277 6. Torque converter
AT-256Items Symptom Condition Diagnostic item Reference page

2. PNP switch adjustment
AT-224 3. Overdrive control switch
AT-172 4. Accelerator pedal position sensor
EC-412
(HR16DE), EC- 959 (MR Type 1)
or EC-1481 (MR
Type 2)
5. Vehicle speed sensor·A/T (Revolution sensor)
and vehicle speed sensor·MTR AT-101 ,
AT-154 6. Shift solenoid valve A
AT-139 7. Shift solenoid valve B
AT-144 8. Control valve assembly
AT-221 OFF vehicle
9. Reverse clutch
AT-296 10. High clutch
AT-301 11. Brake band
AT-330 12. Low & reverse brake
AT-313 13. Oil pump
AT-277 14. Torque converter
AT-256Transaxle noise in
“D”, “2”, “1” and “R”
positions. ON vehicle 1. A/T fluid level
AT-17OFF vehicle 2. Torque converter
AT-256Engine brake does
not operate in “1” po-
sition. ON vehicle1. PNP switch adjustment
AT-224 2. Control cable adjustment
AT-216 3. Vehicle speed sensor·A/T (Revolution sensor)
and vehicle speed sensor·MTR AT-101 ,
AT-154 4. Control valve assembly
AT-221 5. Overrun clutch solenoid valve
AT-149 OFF vehicle
6. Overrun clutch
AT-306 7. Low & reverse brake
AT-313Transaxle overheats.
ON vehicle1. A/T fluid level
AT-17 2. Engine idling speed
EC-30
(HR16DE), EC- 570 (MR Type 1)
or EC-1082 (MR
Type 2)
3. Accelerator pedal position sensor EC-412
(HR16DE), EC- 959 (MR Type 1)
or EC-1481 (MR
Type 2)
4. Line pressure test AT-51 5. Line pressure solenoid valve
AT-134 6. Control valve assembly
AT-221 OFF vehicle
7. Oil pump
AT-277 8. Reverse clutch
AT-296 9. High clutch
AT-301 10. Brake band
AT-330 11. Forward clutch
AT-306 12. Overrun clutch
AT-306Items Symptom Condition Diagnostic item Reference page

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TCM Terminal and Reference Value
INFOID:0000000004305329
TCM HARNESS CONNECTOR TERMINAL LAYOUT
Terminals and Reference Values for TCM TCM terminal data are reference values, measured between each terminal and ground. Others
ATF shoots out during
operation.
White smoke emitted
from exhaust pipe
during operation. ON vehicle 1. A/T fluid level
AT-17OFF vehicle
2. Reverse clutch
AT-296 3. High clutch
AT-301 4. Brake band
AT-330 5. Forward clutch
AT-306 6. Overrun clutch
AT-306 7. Low & reverse brake
AT-313Unusual smell at A/T
fluid charging pipe. ON vehicle 1. A/T fluid level
AT-17OFF vehicle
2. Torque converter
AT-256 3. Oil pump
AT-277 4. Reverse clutch
AT-296 5. High clutch
AT-301 6. Brake band
AT-330 7. Forward clutch
AT-306 8. Overrun clutch
AT-306 9. Low & reverse brake
AT-313Items Symptom Condition Diagnostic item Reference page

Accumulator " for free length (L
1) and
length (L 2
).
(1): Return spring (Servo release accumulator)
(2): Return spring (N-D accumulator)
CAUTION:
Do not remove spring retainer (3).
Installation
Installation is in the reverse order of removal.
CAUTION:
• Completely remove all moisture, oil and old gasket from the oil pan gasket mounting surface of tran-
saxle case and oil pan.
• Do not reuse O-rings, lip seals, oil pan gasket and oil pan bolts.
• Apply ATF to manual valve, O-rings, li p seals and sliding surfaces of the transaxle case.
NOTE:
• Set manual shaft in “N” position, then align manual plate (1) with
groove in manual valve (2).
• After installing control valve assembly to transaxle case, make sure that selector lever can be moved to all positions.
• After completing installation, check for A/T fluid leakage and A/T fluid level. Refer to AT-17, " Checking A/T Fluid " .
Park/Neutral Position (PNP) Switch INFOID:0000000004305504
COMPONENTS