2009 NISSAN LATIO Service Repair Manual

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Page 985 of 4331

NISSAN LATIO 2009 Service Repair Manual TROUBLE DIAGNOSIS
CVT-41
< SERVICE INFORMATION >
[RE0F08A] D
E
F
G H
I
J
K L
M A
B CVT
N
O P
• Inspect for fluid leakage and check the fluid level. Refer to
CVT-17, " Checking CVT Fluid " .
Fluid

Page 986 of 4331

NISSAN LATIO 2009 Service Repair Manual CVT-42< SERVICE INFORMATION >
[RE0F08A]
TROUBLE DIAGNOSIS
6. While holding down the foot brake, gradually press down the accelerator pedal.
7. Quickly read off the stall speed, and the

Page 987 of 4331

NISSAN LATIO 2009 Service Repair Manual CVT
N
O P
The CVT fluid temperature rises in the range of 50 - 80
°C (122 - 176 °F) during 10 minutes of driving.
3. After warming up CVT, remove the oil pressure detection plug and install the oil

Page 988 of 4331

NISSAN LATIO 2009 Service Repair Manual CVT-44< SERVICE INFORMATION >
[RE0F08A]
TROUBLE DIAGNOSIS
Road Test INFOID:0000000004666886
DESCRIPTION
• The purpose of the test is to determine overall performance of CVT and analyze causes of pro

CVT-44< SERVICE INFORMATION >
[RE0F08A]
TROUBLE DIAGNOSIS
Road Test INFOID:0000000004666886
DESCRIPTION
• The purpose of the test is to determine overall performance of CVT and analyze causes of problems.
• The road test consists of the following three parts:
1. “Check Before Engine Is Started” CVT-45 .
2. “Check at Idle” CVT-45 .
3. “Cruise Test” CVT-47 .
Judgement Possible cause
Idle speed Low for all positions
(“P”, “R”, “N”, “D”, “L”) Possible causes include malfunctions in the pressure supply system and low oil pump output.
For example
• Oil pump wear
• Pressure regulator valve or plug sticking or spring fatigue
• Oil strainer ⇒ oil pump ⇒ pressure regulator valve passage oil leak
• Engine idle speed too low
Only low for a specific
position Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
High Possible causes include a sensor malfunction or malfunction in the line pressure adjustment
function.
For example
• Accelerator pedal position signal malfunction
• CVT fluid temperature sensor malfunction
• Pressure control solenoid A (line pressure solenoid) malfunction (sticking in OFF state, filter
clog, cut line)
• Pressure regulator valve or plug sticking
Stall speed Line pressure does
not rise higher than
the line pressure for
idle. Possible causes include a sensor malfunction or malfunction in the pressure adjustment func-
tion.
For example
• Accelerator pedal position signal malfunction
• TCM malfunction
• Pressure control solenoid A (line pressure solenoid) malfunction (shorting, sticking in ON state)
• Pressure regulator valve or plug sticking
The pressure rises,
but does not enter the
standard position. Possible causes include malfunctions in the pressure supply system and malfunction in the pres-
sure adjustment function.
For example
• Accelerator pedal position signal malfunction
• Pressure control solenoid A (line pressure solenoid) malfunction (sticking, filter clog)
• Pressure regulator valve or plug sticking
Only low for a specific
position Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve. SAT786A

Page 989 of 4331

NISSAN LATIO 2009 Service Repair Manual TROUBLE DIAGNOSIS
CVT-45
< SERVICE INFORMATION >
[RE0F08A] D
E
F
G H
I
J
K L
M A
B CVT
N
O P
• Before road test, familiarize yourself with all test procedures and
items to check.
• Perfor

Page 990 of 4331

NISSAN LATIO 2009 Service Repair Manual How to Perform Trouble Diagnosis for Quick and
Accurate Repair " . Go to
CVT-157, " Engine Cannot Be Started in "P" and "N" Position " .
YES >> Stop “Road Test”. Mark the box on the
CVT-34, "

Page 991 of 4331

NISSAN LATIO 2009 Service Repair Manual CVT
N
O P
Cruise Test
INFOID:0000000004666889" Vehicle Speed When Shifting Gears " .
OK or NG OK >> GO TO 2.
NG >> Mark the box of CVT-161, " Vehicle Speed Does Not
Change in "L" Position

Page 992 of 4331

NISSAN LATIO 2009 Service Repair Manual " Vehicle Speed When Shifting Gears " .
OK or NG OK >> GO TO 5.
NG >> Mark the box of CVT-161, " Vehicle Speed Does Not
Change in "L" Position " on the
CVT-34, " How to Per-
form

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