oil NISSAN LATIO 2009 Service User Guide

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

AT
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Line Pressure
Judgement of Line Pressure Test
Road Test INFOID:0000000004305320
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-56 .
2. Check at idle. Refer to AT-56 .
3. Cruise test • Inspection all the item from Part 1 to Part 3. Refer to AT-58 ,
AT-61 and
AT-62 .
Engine speed
Line pressure [kPa (kg/cm
2
, psi)]
D, 2nd and 1st positions R position
Idle speed AT-373, " Line Pressure "
Stall speed
Judgement Suspected 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-22, " 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

AT
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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

AT
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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

AT
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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

AT-100< SERVICE INFORMATION >
DTC P0710 A/T FLUID TEMP
ERATURE SENSOR CIRCUIT
OK >> INSPECTION END
NG >> GO TO 8. 8.
CHECK TCM
1. Check TCM input/output signal. Refer to AT-77, " TCM Terminal and Reference Value " .
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG OK >>
INSPECTION END
NG >> Repair or replace damaged parts.
Component Inspection INFOID:0000000004305353
A/T FLUID TEMPERATURE SENSOR
• Remove oil pan. Refer to AT-221, " Control Valve Assembly and
Accumulators " .
• Check resistance between terminal cord assembly harness con-
nector terminals while changing temperature as shown.
Item Connector Terminal Temperature
[° C ( °F)] Resistance
(Approx.)
A/T fluid temperature sensor F30 6 - 7
AT-379, " A/T Fluid Temper-
ature Sensor "
SCIA7831E

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DTC P0734 A/T 4TH GEAR FUNCTION
Description INFOID:0000000004305383
• This malfunction will not be detected while the OD OFF indicator lamp is indicating another self-diagnosis malfunction.
• This malfunction is detected when the A/T does not shif t into fourth gear position or the torque converter
clutch does not lock up as instructed by the TCM. This is not caused by electrical malfunction (circuits open
or shorted) but by mechanical malfunction such as c ontrol valve sticking, improper solenoid valve operation,
malfunctioning oil pump or torque converter clutch, etc.
CONSULT-III Reference Val ue in Data Monitor Mode INFOID:0000000004305384
Remarks: Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004305385
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0734 A/T 4TH GR FNCTN” with CONSULT-III is detected when A/T cannot be
shifted to the 4th gear position even if electrical circuit is good.
• This diagnosis monitors actual gear position by checki ng the torque converter slip ratio calculated by TCM
as follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is much lower than the pos ition (4th) supposed by TCM, the slip ratio will be much
less than normal. In case the ratio does not reach t he specified value, TCM judges this diagnosis malfunc-
tion.
This malfunction will be caused when shift solenoid valve A is stuck open or shift solenoid valve B is stuck
closed.
• Gear positions supposed by TCM are as follows.
In case of gear position with no malfunctions: 1, 2, 3 and 4 positions
In case of gear position with shift solenoid valve A stuck open: 2, 2, 3 and 3* positions
In case of gear position with shift solenoid valve B stuck closed: 1, 2, 2 and 1* positions to each gear position
above
*: “P0734 A/T 4TH GR FNCTN” is detected.
Possible Cause INFOID:0000000004305386
• Shift solenoid valve A
• Shift solenoid valve B
• Line pressure solenoid valve
• Each clutch
• Hydraulic control circuit
DTC Confirmation Procedure INFOID:0000000004305387
CAUTION:
• Always drive vehicle at a safe speed.
• If performing this “DTC Confirmation Procedure” again, always turn ignition switch OFF and wait at
least 10 seconds before continuing.
After the repair, perform the following procedure to confirm the malfunction is eliminated. Gear position 1 2 3 4
Shift solenoid valve A ON (Closed) OFF (Open) OFF (Open) ON (Closed)
Shift solenoid valve B ON (Closed) ON (Closed) OFF (Open) OFF (Open) Item name Condition Display value (Approx.)
LINE PRES DTY Small throttle opening (Low line pressure)
⇔ Large
throttle opening (High line pressure) 0%
⇔ 94%