2011 NISSAN LATIO brake fluid

A/T CONTROL SYSTEMAT-33
< SERVICE INFORMATION >
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The line pressure is temporarily reduced corresponding to a change
in engine torque when shifting gears (that is, when the shift solenoid
valve is switched for clutch operation) to reduce shifting shock.
AT LOW FLUID TEMPERATURE
• A/T fluid viscosity and frictional characteristics of t he clutch facing change with A/T fluid temperature. Clutch
engaging or band-contacting pressure is compensated for, according to A/T fluid temperature, to stabilize
shifting quality.
• The line pressure is reduced below 60 °C (140° F) to prevent shift-
ing shock due to high viscosity of A/T fluid when temperature is
low.
• Line pressure is increased to a maximum irrespective of the throt- tle opening when A/T fluid temperature drops to −10° C (14° F). This
pressure rise is adopted to prevent a delay in clutch and brake
operation due to extreme drop of A/T fluid viscosity at low temper-
ature.
Shift ControlINFOID:0000000005928079
The shift is regulated entirely by electronic cont rol to accommodate vehicle speed and varying engine opera-
tions. This is accomplished by electrical signals trans mitted by the output speed sensor and the ECM (acceler-
ator pedal position sensor). This results in improved acceleration performance and fuel economy.
CONTROL OF SHIFT SOLENOID VALVES A AND B
The TCM activates shift solenoid valves A and B according to sig-
nals from the accelerator pedal position sensor and output speed
sensor to select the optimum gear position on the basis of the shift
schedule memorized in the TCM.
The shift solenoid valve performs simple ON-OFF operation. When
set to “ON”, the drain circuit closes and pilot pressure is applied to
the shift valve.
RELATION BETWEEN SHIFT SOLENOID VALVES A AND B AND GEAR POSITIONS
SCIA4828E
SCIA4829E
SCIA4830E
SAT008J
Revision: May 2010 2011 Versa

AT-46
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Diagnostic Worksheet Chart
Customer name MR./MS Model & YearVIN
Trans. model EngineMileage
Incident Date Manuf. DateIn Service Date
Frequency † Continuous † Intermittent ( times a day)
Symptoms † Vehicle does not move. ( † Any position † Particular position)
† No up-shift ( † 1st → 2nd † 2nd → 3rd † 3rd → 4th)
† No down-shift ( † 4th → 3rd † 3rd → 2nd† 2nd → 1st)
† Lock-up malfunction
† Shift point too high or too low.
† Shift shock or slip ( † N → D † Lock-up † Any drive position)
† Noise or vibration
† No kick down
† No pattern select
† Others
()
Malfunction indicator lamp (MIL) † Continuously lit † Not lit
1. † Read the Fail-safe and listen to customer complaints. AT- 4 2,
"Information
from
customer"
2. † Check A/T fluid AT- 1 7
† Leakage (Follow specified procedure)
† Fluid condition
† Fluid level
3. † Perform “STALL TEST” and “LINE PRESSURE TEST”. AT- 5 1
†“STALL TEST”— Mark possible damaged components/others.
† Torque converter one-way clutch
† Reverse clutch
† Forward clutch
† Overrun clutch
† Forward one-way clutch †
Low & reverse brake
† Low one-way clutch
† Engine
† Line pressure is low
† Clutches and brakes except high clutch and
brake band are OK
† “LINE PRESSURE TEST”— Suspected parts:
Revision: May 2010 2011 Versa

AT-48
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
4. 4-3. “Cruise Test”AT- 5 8
Part 1
†AT- 1 8 7 , "
Vehicle Cannot Be Started from D1" .
† AT- 1 8 9 , "
A/T Does Not Shift: D1→ D2or Does Not Kickdown: D4→ D2" .
† AT- 1 9 0 , "
A/T Does Not Shift: D2→ D3" .
† AT- 1 9 2 , "
A/T Does Not Shift: D3→ D4" .
† AT- 1 9 3 , "
A/T Does Not Perform Lock-up" .
† AT- 1 9 4 , "
A/T Does Not Hold Lock-up Condition" .
† AT- 1 9 5 , "
Lock-up Is Not Released" .
† AT- 1 9 6 , "
Engine Speed Does Not Return to Idle (Light Braking D4→ D3)" .
Part 2 AT- 6 1
†AT- 1 8 7 , "Vehicle Cannot Be Started from D1" .
† AT- 1 8 9 , "
A/T Does Not Shift: D1→ D2or Does Not Kickdown: D4→ D2" .
† AT- 1 9 0 , "
A/T Does Not Shift: D2→ D3" .
† AT- 1 9 2 , "
A/T Does Not Shift: D3→ D4" .
Part 3 AT- 6 2
†AT- 1 9 7 , "A/T Does Not Shift: D4→ D3, When OD OFF" .
† AT- 1 9 8 , "
A/T Does Not Shift: D3→ 22, When Selector Lever "D" → "2" Position" .
† AT- 1 9 9 , "
A/T Does Not Shift: 22→ 11, When Selector Lever "2" → "1" Position" .
† AT- 2 0 1 , "
Vehicle Does Not Decelerate by Engine Brake" .
† Perform self-diagnosis. Enter checks for detected items. AT- 7 7
, AT- 8 2 .
† CAN COMM CIRCUIT AT- 8 7
.
† TRANSMISSION RANGE SWITCH A AT- 9 0
.
† TRANSMISSION FLUID TEMPERATURE SENSOR A AT- 9 5
.
† OUTPUT SPEED SENSOR AT- 1 0 0
.
† ENGINE SPEED AT- 1 0 5
.
† 1GR INCORRECT RATIO AT- 1 0 9
† 2GR INCORRECT RATIO AT- 11 2 .
† 3GR INCORRECT RATIO AT- 11 5
.
† 4GR INCORRECT RATIO AT- 11 8
.
† TORQUE CONVERTER AT-123
.
† TORQUE CONVERTER AT-128
.
† PRESSURE CONTROL SOLENOID A AT- 1 3 3
.
† SHIFT SOLENOID A AT- 1 3 8
.
† SHIFT SOLENOID B AT- 1 4 3
.
† OVERRUN CLUTCH SOLENOID AT- 1 4 8
.
† VEHICLE SPEED SIGNAL AT- 1 5 3
.
† BATT/FLUID TEMP SEN AT-156
.
† INPUT SPEED SENSOR A AT- 1 6 2
.
† CONTROL UNIT (RAM), CONTROL UNIT (ROM) AT-167
.
† MAIN POWER SUPPLY AND GROUND CIRCUIT AT- 1 6 8
.
5. † For self-diagnosis NG items, inspect each component. Repair or replace the damaged parts. AT- 7 7
,
AT- 8 2
6. † Perform “Road Test”. AT- 5 5
7.† Perform the Diagnostic Procedures for all remaining items marked NG. Repair or replace the damaged parts.
Refer to the Symptom Chart when you perform the procedures. (The chart also shows some other possible symp-
toms and the component inspection orders.) AT- 6 5
8.
† Erase DTC from TCM and ECM memories. AT- 3 9,
AT- 8 2
Revision: May 2010 2011 Versa

TROUBLE DIAGNOSISAT-51
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Inspections Before Trouble DiagnosisINFOID:0000000005928094
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
scorchedReplace 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.
SAT638A
ATF operating temperature: 50 - 80
°C (122 - 176 °F)
SAT647B
SAT513G
SAT775B
Revision: May 2010 2011 Versa

TROUBLE DIAGNOSISAT-55
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Line Pressure
Judgement of Line Pressure Test
Road TestINFOID:0000000005928095
DESCRIPTION
• The purpose of the test is to det
ermine overall performance of A/T
and analyze causes of malfunctions.
• The road test consists of the following three parts:
1. Check before engine is started. Refer to AT- 5 6
.
2. Check at idle. Refer to AT- 5 6
.
3. Cruise test • Inspection all the item from Part 1 to Part 3. Refer to AT- 5 8
,
AT- 6 1
and AT- 6 2 .
Engine speed Line pressure [kPa (kg/cm
2 , psi)]
D, 2nd and 1st positions R position
Idle speed AT- 3 7 4 , "
Line Pressure"Sta ll sp ee d
JudgementSuspected parts
At idle Line pressure is low in all positions. • Oil pump wear
• Control piston damage
• Pressure regulator valve or plug sticking
• Spring for pressure regulator valve damaged
• Fluid pressure leakage between oil strainer and pressure regulator valve
• Clogged strainer
Line pressure is low in particular posi-
tion. • Fluid pressure leakage between manual valve and particular clutch
• For example, line pressure is:
− Low in “R” and “1 ” positions, but
− Normal in “D”, and “2” positions.
Therefore, fluid leakage exists at or around low and reverse brake circuit.
Refer to AT- 2 2 , "
Shift Mechanism".
Line pressure is high. • Accelerator pedal position signal malfunction
• A/T fluid temperature sensor damaged
• Line pressure solenoid valve sticking
• Short circuit of line pressure solenoid valve circuit
• Pressure modifier valve sticking
• Pressure regulator valve or plug sticking
• Open in dropping resistor circuit
At stall
speed Line pressure is low.
• Accelerator pedal position signal malfunction
• Line pressure solenoid valve sticking
• Short circuit of line pressure solenoid valve circuit
• Pressure regulator valve or plug sticking
• Pressure modifier valve sticking
• Pilot valve sticking
SAT786A
Revision: May 2010 2011 Versa

AT-66
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Shift ShockSharp shock in shift-
ing from “N” to “D” po-
sition.
ON vehicle1. Engine idling speed
EC-24

(HR16DE), EC-
578 (MR18DE)
2. Accelerator pedal position sensor EC-415

(HR16DE), EC-
982 (MR18DE)
3. Line pressure test AT- 5 1
4. A/T fluid temperature sensorAT- 9 5
5. Engine speed signalAT- 1 0 5
6. Line pressure solenoid valveAT- 1 3 3
7. Control valve assemblyAT- 2 2 2
8. Accumulator N-DAT- 2 2 2
OFF vehicle 9. Forward clutch AT- 3 0 7
Too sharp a shock in
changing from D
1 to
D
2 . ON vehicle1. Accelerator pedal position sensor
EC-415

(HR16DE), EC-
982 (MR18DE)
2. Line pressure test AT- 5 1
3. Accumulator servo releaseAT- 2 2 2
4. Control valve assemblyAT- 2 2 2
5. A/T fluid temperature sensorAT- 9 5
OFF vehicle 6. Brake band AT- 3 3 1
Shift ShockToo sharp a shock in
changing from D
2 to
D
3 . ON vehicle
1. Accelerator pedal position sensor
EC-415

(HR16DE), EC-
982 (MR18DE)
2. Line pressure test AT- 5 1
3. Control valve assemblyAT- 2 2 2
OFF vehicle4. High clutch
AT- 3 0 25. Brake bandAT- 3 3 1
Too sharp a shock in
changing from D
3 to
D
4 . ON vehicle
1. Accelerator pedal position sensor
EC-415

(HR16DE), EC-
982 (MR18DE)
2. Line pressure test AT- 5 1
3. Control valve assemblyAT- 2 2 2
OFF vehicle4. Brake band
AT- 3 3 15. Overrun clutchAT- 3 0 7
6. Forward one-way clutchAT- 3 1 8
Gear change shock
during deceleration by
releasing accelerator
pedal.ON vehicle1. Accelerator pedal position sensor
EC-415

(HR16DE), EC-
982 (MR18E)
2. Line pressure test AT- 5 1
3. Overrun clutch solenoid valveAT- 1 4 8
4. Control valve assemblyAT- 2 2 2
Large shock in chang-
ing from 1
2 to 11 in
“1” position. ON vehicle 1. Control valve assembly
AT- 2 2 2OFF vehicle 2. Low & reverse brakeAT- 3 1 4
ItemsSymptom Condition Diagnostic itemReference page
Revision: May 2010 2011 Versa

TROUBLE DIAGNOSISAT-67
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Improper Shift Timing Too high a gear
change point from D
1
to D
2 , from D2 to D3 ,
from D
3 to D4 . ON vehicle 1. Accelerator pedal position sensor
EC-415

(HR16DE), EC-
982 (MR18DE)
2. Output speed sensor and vehicle speed signal AT- 1 0 0
, AT- 1 5 3
3. Shift solenoid valve AAT- 1 3 8
4. Shift solenoid valve BAT- 1 4 3
Gear change directly
from D
1 to D3 occurs.ON vehicle
1. A/T fluid level
AT- 1 72. Accumulator servo releaseAT- 2 2 2
OFF vehicle 3. Brake band AT- 3 3 1
Too high a change
point from D
4 to D3 ,
from D
3 to D 2 , from
D
2 to D1 . ON vehicle
1. Accelerator pedal position sensor EC-415

(HR16DE), EC-
982 (MR18DE)
2. Output speed sensor and vehicle speed signal AT- 1 0 0
, AT- 1 5 3
Kickdown does not
operate when de-
pressing accelerator
pedal in D
4 within
kickdown vehicle
speed. ON vehicle
1. Accelerator pedal position sensor
EC-415

(HR16DE), EC-
982 (MR18DE)
2. Output speed sensor and vehicle speed signal AT- 1 0 0
, AT- 1 5 3
3. Shift solenoid valve AAT- 1 3 8
4. Shift solenoid valve BAT- 1 4 3
Kickdown operates or
engine overruns when
depressing accelera-
tor pedal in D
4 be-
yond kickdown
vehicle speed limit. ON vehicle1. Output speed sensor and vehicle speed signal
AT- 1 0 0
, AT- 1 5 3
2. Accelerator pedal position sensorEC-415

(HR16DE), EC-
982 (MR18DE)
3. Shift solenoid valve A AT- 1 3 8
4. Shift solenoid valve BAT- 1 4 3
Gear change from 22
to 2
3 in “2” position. ON vehicle1. Transmission range switch adjustment
AT- 2 2 52. Control cable adjustmentAT- 2 1 7
Gear change from 11
to 1
2 in “1” position. ON vehicle1. Transmission range switch adjustment
AT- 2 2 52. Control cable adjustmentAT- 2 1 7
ItemsSymptom Condition Diagnostic itemReference page
Revision: May 2010 2011 Versa

AT-68
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
No Down ShiftFailure to change
gear from D
4 to D3 .
ON vehicle 1. A/T fluid level
AT- 1 7
2. Accelerator pedal position sensorEC-415

(HR16DE), EC-
982 (MR18DE)
3. Overrun clutch solenoid valve AT- 1 4 8
4. Shift solenoid valve A AT- 1 3 8
5. Line pressure solenoid valveAT- 1 3 3
6. Control valve assemblyAT- 2 2 2
OFF vehicle7. Brake band
AT- 3 3 18. Overrun clutchAT- 3 0 7
Failure to change
gear from D
3 to D2 or
from D
4 to D2 . ON vehicle 1. A/T fluid level
AT- 1 7
2. Accelerator pedal position sensorEC-415

(HR16DE), EC-
982 (MR18DE)
3. Shift solenoid valve A AT- 1 3 8
4. Shift solenoid valve BAT- 1 4 3
5. Control valve assemblyAT- 2 2 2
OFF vehicle6. High clutch
AT- 3 0 27. Brake bandAT- 3 3 1
Failure to change
gear from D
2 to D1 or
from D
3 to D1 . ON vehicle 1. A/T fluid level
AT- 1 7
2. Accelerator pedal position sensorEC-415

(HR16DE), EC-
982 (MR18DE)
3. Shift solenoid valve A AT- 1 3 8
4. Shift solenoid valve BAT- 1 4 3
5. Control valve assemblyAT- 2 2 2
OFF vehicle6. Low one-way clutch
AT- 2 5 77. High clutchAT- 3 0 2
8. Brake bandAT- 3 3 1
Failure to change
from D
3 to 22 when
shifting selector lever
into “2” position.
AT- 1 9 8ON vehicle 1. Accelerator pedal position sensor
EC-415

(HR16DE), EC-
982 (MR18DE)
2. Shift solenoid valve B AT- 1 4 3
3. Control valve assembly AT- 2 2 2
4. Control cable adjustmentAT- 2 1 7
OFF vehicle 5. Brake band AT- 3 3 1
Does not change from
1
2 to 11 in 1st posi-
tion. ON vehicle1. Transmission range switch adjustment
AT- 2 2 5
2. Output speed sensor and vehicle speed signalAT- 1 0 0, AT- 1 5 3
3. Shift solenoid valve A AT- 1 3 8
4. Control valve assemblyAT- 2 2 2
5. Overrun clutch solenoid valveAT- 1 4 8
OFF vehicle6. Overrun clutch
AT- 3 0 77. Low & reverse brakeAT- 3 1 4
ItemsSymptom Condition Diagnostic itemReference page
Revision: May 2010 2011 Versa