2009 NISSAN LATIO engine

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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

). Per-
form a diagnosis of the NG items after the completion of all the
road tests.
Check Before Engine Is Started INFOID:0000000004305321YES >> 1. Turn ignition switch OFF.
2. Perform self-diagnosis and note NG items.Refer to AT-79, " CONSULT-III Function (TRANS-
MISSION) " ,
AT-83, " Diagnosis Procedure without
CONSULT-III " .
3. Go to AT-56, " Check at Idle " .
NO >> Stop “Road Test”. Go to AT-181, " OD OFF Indicator
Lamp Does Not Come On " .
Check at Idle INFOID:0000000004305322YES >> GO TO 2.
NO >> • Stop “Road Test”. Mark the box on the “Diagnostic
Worksheet Chart”.
• Go to AT-183, " Engine Cannot Be Started in "P" and
"N" Position " . SAT772B
SAT769B

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2. Move selector lever to “R”, “D”, “2” or “1” position.
3. Turn ignition switch to “START” position.
Is engine started? YES >> • Stop “Road Test”. Mark the box on the “Diagnostic
Worksheet Chart”.
• Go to AT-183, " Engine Cannot Be Started in "P" and
"N" Position " .
• Continue “Road Test”.
NO >> GO TO 3. YES >> • Mark the box on the “D
iagnostic Worksheet Chart”.
• Go to AT-184, " In "P" Position, Vehicle Moves Forward
or Backward When Pushed " .
• Continue “Road Test”.
NO >> GO TO 4. YES >> • Mark the box on the “D
iagnostic Worksheet Chart”.
• Go to AT-184, " In "N" Position, Vehicle Moves " .
• Continue “Road Test”.
NO >> GO TO 5. SAT768B
SAT796A
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3. Push overdrive control switch. (OD OFF indicator lamp is off.)
4. Move selector lever to “P” position.
5. Start engine.
6. Move selector lever to “D” position.
7. Accelerate vehicle by constantly depressing accelerator pedal half-way.
Read gear position. Refer to AT-79, " CONSULT-III Func-
tion (TRANSMISSION) " .
Does vehicle start from D YES >> GO TO 2.
NO >> • Mark the box on the “D iagnostic Worksheet Chart”.
• Go to AT-188, " Vehicle Cannot Be Started from D .
• Continue “Road Test”. Vehicle Speed at Which Gear Shifting Occurs " .
Read gear position, throttl e opening and vehicle speed.
Refer to AT-79, " CONSULT-III Function (TRANSMISSION) " .
Does A/T shift from D YES >> GO TO 3.
NO >> • Mark the box on the “D iagnostic Worksheet Chart”.
• Go to AT-190, " A/T Does Not Shift: D
Not Kickdown: D .
• Continue “Road Test”. Vehicle Speed at Which Gear Shifting Occurs " .SAT775B
SAT495G

TROUBLE DIAGNOSIS
AT-61
< SERVICE INFORMATION >
D
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F
G H
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M A
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• Continue “Road Test”. 8.
CHECK SHIFT-DOWN (D 4 TO D 3 )
Decelerate vehicle by applying foot brake lightly. Read gear position and engine speed. Refer to AT-79, " CON-
SULT-III Functi
on (TRANSMISSION) " .
Does engine speed return to idle smoothly when A/T is shifted from D 4 to D 3 ?
YES >> 1. Stop vehicle.
2. Go to AT-61, " Cruise Test - Part 2 " .
NO >> • Mark the box on the “D iagnostic Worksheet Chart”.
• Go to AT-197, " Engine Speed Does Not Return to Idle
(Light Braking D 4 → D 3 ) " .
• Continue “Road Test”.
Cruise Test - Part 2 INFOID:00000000043053241.
CHECK STARTING GEAR (D 1 ) POSITION
1. Push overdrive control switch. (OD OFF indicator lamp is off.)
2. Move selector lever to “D” position.
3. Accelerate vehicle by half throttle again.
Read gear position. Refer to AT-79, " CONSULT-III Func-
tion (TRANSMISSION) " .
Does vehicle start from D 1 ?
YES >> GO TO 2.
NO >> • Mark the box on the “D iagnostic Worksheet Chart”.
• Go to AT-188, " Vehicle Cannot Be Started from D 1 " .
• Continue “Road Test”. 2.
CHECK SHIFT-UP AND SHIFT-DOWN (D 3 TO D 4 TO D 2 )
1. Accelerate vehicle to 80 km/h (50 MPH) as shown in the figure.
2. Release accelerator pedal and then quickly depress it fully.
Read gear position and th rottle opening. Refer to AT-79," CONSULT-III Function (TRANSMISSION) " .
Does A/T shift from D 4 to D 2 as soon as accelerator pedal is
depressed fully?
YES >> GO TO 3.
NO >> • Mark the box on the “D iagnostic Worksheet Chart”.
• Go to AT-190, " A/T Does Not Shift: D 1 → D 2 or Does
Not Kickdown: D 4 → D 2 " .
• Continue “Road Test”. 3.
CHECK SHIFT-UP (D 2 TO D 3 )
Check shift-up (D 2 to D 3 )
Specified speed when shifting from D 2 to D 3 . Refer to AT-64, " Vehicle Speed at Which Gear Shifting Occurs " .SAT959I
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5. Push overdrive control switch. (OD OFF indicator lamp is on.)
Read gear position and vehicle speed. Refer to AT-79," CONSULT-III Function (TRANSMISSION) " .
Does A/T shift from D YES >> GO TO 2.
NO >> • Mark the box on the “D iagnostic Worksheet Chart”.
• Go to AT-198, " A/T Does Not Shift: D
OFF " .
• Continue “Road Test”. YES >> GO TO 3.
NO >> • Mark the box on the “D iagnostic Worksheet Chart”.
• Go to AT-202, " Vehicle Does Not Decelerate by
Engine Brake " .
• Continue “Road Test”. CONSULT-III Function
(TRANSMISSION) " .
Does A/T shift from D YES >> GO TO 4.
NO >> • Mark the box on the “D iagnostic Worksheet Chart”.
• Go to AT-199, " A/T Does Not Shift: D
Selector Lever "D" " .
• Continue “Road Test”. YES >> GO TO 5.
NO >> • Mark the box on the “D iagnostic Worksheet Chart”.
• Go to AT-202, " Vehicle Does Not Decelerate by
Engine Brake " .
• Continue “Road Test”. SAT791GA

CONSULT-III Function
(TRANSMISSION) " .
Does A/T shift from 2 YES >> GO TO 6.
NO >> • Mark the box on the “Diagnostic Worksheet Chart”.
• Go to AT-200, " A/T Does Not Shift: 2
Selector Lever "2" " .
• Continue “Road Test”. YES >> 1. Stop vehicle.
2. Perform self-diagnosis. Refer to AT-79, " CONSULT-
III Function (TRANSMISSION) " ,
AT-83, " Diagnosis
Procedure without CONSULT-III " .
NO >> • Mark the box on the “Diagnostic Worksheet Chart”. • Go to AT-202, " Vehicle Does Not Decelerate by
Engine Brake " .
• Stop “Road Test”.
Vehicle Speed at Which Gear Shifting Occurs INFOID:0000000004305326
MR16DE engine models
MR18DE engine models
• At half throttle, the accelerator opening is 4/8 of the full opening.
Vehicle Speed at Which Lock-up Occurs/Releases INFOID:0000000004305327
MR16DE engine models
MR18DE engine models SAT778B
Throttle position Selector lever position
Vehicle speed km/h (MPH)
Lock-up ON Lock-up OFF
2.0/8 “D” position 73 - 81 (46
- 50) 49 - 57 (31 - 35)
“D” position (OD OFF) 86 - 94 (53 - 58) 82 - 90 (51 - 55)
Throttle position Selector lever position Vehicle speed km/h (MPH)
Lock-up ON Lock-up OFF
2.0/8 “D” position 86 - 94 (53
- 58) 59 - 67 (37 - 42)
“D” position (OD OFF) 86 - 94 (53 - 58) 83 - 91 (52 - 57)

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Symptom Chart
INFOID:0000000004305328
Numbers are arranged in order of inspection.
Perform inspections starting with number one and work up.
Items Symptom Condition Diagnostic item Reference page
No Lock-up Engage-
ment/TCC Inoperative Torque converter is
not locked up. ON vehicle1. Accelerator pedal position sensor
EC-412
(HR16DE), EC- 959 (MR Type 1)
or EC-1481 (MR
Type 2)
2. Vehicle speed sensor·A/T (Revolution sensor)
and vehicle speed sensor·MTR AT-101 ,
AT-154 3. Engine speed signal
AT-106 4. A/T fluid temperature sensor
AT-96 5. Line pressure test
AT-51 6. Torque converter clutch solenoid valve
AT-124 7. Control valve assembly
AT-221 OFF vehicle 8. Torque converter
AT-256Torque converter
clutch piston slip. 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. Torque converter clutch solenoid valve
AT-124 5. Line pressure solenoid valve
AT-134 6. Control valve assembly
AT-221 OFF vehicle 7. Torque converter
AT-256Lock-up point is ex-
tremely high or low. ON vehicle1. Accelerator pedal position sensor
EC-412
(HR16DE), EC- 959 (MR Type 1)
or EC-1481 (MR
Type 2)
2. Vehicle speed sensor·A/T (Revolution sensor)
and vehicle speed sensor·MTR AT-101 ,
AT-154 3. Torque converter clutch solenoid valve
AT-124 4. Control valve assembly
AT-221