2005 NISSAN NAVARA low oil pressure

AT-4
Sensor 2 ...............................................................218
Parking Components (2WD Models Only) ............230
Rear Oil Seal ........................................................237
Revolution Sensor Components (2WD Models
Only) .....................................................................238
AIR BREATHER HOSE ...........................................243
Removal and Installation ......................................243
A/T FLUID COOLER ...............................................244
Removal and Installation ......................................244
TRANSMISSION ASSEMBLY ................................247
Removal and Installation ......................................247
OVERHAUL .............................................................251
Components .........................................................251
Oil Channel ...........................................................259
Locations of Adjusting Shims, Needle Bearings,
Thrust Washers and Snap Rings ..........................261
DISASSEMBLY .......................................................263
Disassembly .........................................................263
REPAIR FOR COMPONENT PARTS ......................281
Oil Pump ...............................................................281
Front Sun Gear, 3rd One-way Clutch ...................284Front Carrier, Input Clutch, Rear Internal Gear .....286
Mid Sun Gear, Rear Sun Gear, High and Low
Reverse Clutch Hub ..............................................291
High and Low Reverse Clutch ..............................296
Direct Clutch .........................................................298
ASSEMBLY .............................................................300
Assembly (1) .........................................................300
Adjustment ............................................................313
Assembly (2) .........................................................316
SERVICE DATA AND SPECIFICATIONS (SDS) ....323
General Specifications ..........................................323
Stall Speed ............................................................323
Line Pressure ........................................................323
Vehicle Speed at Which Gear Shifting Occurs ......324
Vehicle Speed at Which Lock-Up Occurs/Releases.324
A/T Fluid Temperature Sensor ..............................324
Vehicle Speed Sensor A/T (Revolution Sensor) ...325
Turbine Revolution Sensor ....................................325
Reverse Brake ......................................................325
Total End Play .......................................................325

A/T CONTROL SYSTEM
AT-33
D
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AT
Control ValveECS00FWP
FUNCTION OF CONTROL VALVE
FUNCTION OF PRESSURE SWITCH
Name Function
Torque converter regulator valveIn order to prevent the pressure supplied to the torque converter from being excessive, the
line pressure is adjusted to the optimum pressure (torque converter operating pressure).
Pressure regulator valve
Pressure regulator plug
Pressure regulator sleeveAdjusts the oil discharged from the oil pump to the optimum pressure (line pressure) for
the driving state.
Front brake control valveWhen the front brake is coupled, adjusts the line pressure to the optimum pressure (front
brake pressure) and supplies it to the front brake. (In 1st, 2nd, 3rd, and 5th gears, adjusts
theclutchpressure.)
Accumulator control valveAdjusts the pressure (accumulator control pressure) acting on the accumulator piston and
low coast reducing valve to the pressure appropriate to the driving state.
Pilot valve AAdjusts the line pressure and produces the constant pressure (pilot pressure) required for
line pressure control, shift change control, and lock-up control.
Pilot valve BAdjusts the line pressure and produces the constant pressure (pilot pressure) required for
shift change control.
Low coast brake switching valve During engine braking, supplies the line pressure to the low coast brake reducing valve.
Low coast brake reducing valveWhen the low coast brake is coupled, adjusts the line pressure to the optimum pressure
(low coast brake pressure) and supplies it to the low coast brake.
N-R accumulator Produces the stabilizing pressure for when N-R is selected.
Direct clutch piston switching valve Operates in 4th gear and switches the direct clutch coupling capacity.
High and low reverse clutch control valveWhen the high and low reverse clutch is coupled, adjusts the line pressure to the optimum
pressure (high and low reverse clutch pressure) and supplies it to the high and low reverse
clutch. (In 1st, 3rd, 4th and 5th gears, adjusts the clutch pressure.)
Input clutch control valveWhen the input clutch is coupled, adjusts the line pressure to the optimum pressure (input
clutch pressure) and supplies it to the input clutch. (In 4th and 5th gears, adjusts the clutch
pressure.)
Direct clutch control valveWhen the direct clutch is coupled, adjusts the line pressure to the optimum pressure
(direct clutch pressure) and supplies it to the direct clutch. (In 2nd, 3rd, and 4th gears,
adjusts the clutch pressure.)
TCC control valve
TCC control plug
TCC control sleeveSwitches the lock-up to operating or released. Also, by performing the lock-up operation
transiently, lock-up smoothly.
Torque converter lubrication valveOperates during lock-up to switch the torque converter, cooling, and lubrication system oil
path.
Cool bypass valve Allows excess oil to bypass cooler circuit without being fed into it.
Line pressure relief valve Discharges excess oil from line pressure circuit.
N-D accumulator Produces the stabilizing pressure for when N-D is selected.
Manual valveSends line pressure to each circuit according to the select position. The circuits to which
the line pressure is not sent drain.
Name Function
ATFpressureswitch1(FR/B)Detects any malfunction in the front brake hydraulic pressure. When it detects any malfunction,
it puts the system into fail-safe mode.
ATFpressureswitch2(LC/B)Detects any malfunction in the low coast brake hydraulic pressure. When it detects any mal-
function, it puts the system into fail-safe mode.
ATFpressureswitch3(I/C)Detects any malfunction in the input clutch hydraulic pressure. When it detects any malfunction,
it puts the system into fail-safe mode.
ATF pressure switch 5 (D/C)Detects any malfunction in the direct clutch hydraulic pressure. When it detects any malfunc-
tion, it puts the system into fail-safe mode.
ATF pressure switch 6 (HLR/C)Detects any malfunction in the high and low reverse clutch hydraulic pressure. When it detects
any malfunction, it puts the system into fail-safe mode.

AT-44
TROUBLE DIAGNOSIS
CAUTION:
Run the engine at idle for at least 1 minute.
9. Repeat steps 5 through 8 with selector lever in “3”, “2”, “1” and “R” positions.
Judgement of Stall Test
O: Stall speed within standard value position
H: Stall speed higher than standard value
L: Stall speed lower than standard value
Stall test standard value position
LINE PRESSURE TEST
Line Pressure Test Port
Line Pressure Test Procedure
1. Inspect the amount of engine oil and replenish if necessary.
2. Drive the car for about 10 minutes to warm it up so that the ATF reaches in range of 50 to 80°C(122to
176°F), then inspect the amount of ATF and replenish if necessary.
NOTE:
The A/T fluid temperature rises in range of 50 to 80°C (122 to 176°F) during 10 minutes of driving.
3. After warming up remove the oil pressure detection plug and
install the oil pressure gauge (ST2505S001).
CAUTION:
When using the oil pressure gauge, be sure to use O-ring
attached to the oil pressure detection plug.
Selector lever position
Expected problem location
“D”, “3”, “2”
and “1”“R”
Stall rotationHO
lForward brake
lForward one-way clutch
l1st one-way clutch
l3rd one-way clutch
OH
lReverse brake
LL
lEngine and torque converter one-way clutch
HH
lLine pressure low
Does not shift-up “D” position 1®2 Slipping in 2nd, 3rd or 4th gear Direct clutch slippage
Does not shift-up “D” position 2®3 Slipping in 3rd, 4th or 5th gear High and low reverse clutch slippage
Does not shift-up “D” position 3®4 Slipping in 4th or 5th gear Input clutch slippage
Does not shift-up “D” position 4®5 Slipping in 5th gear Front brake slippage
SCIA2187E
SCIA0574E

TROUBLE DIAGNOSIS
AT-45
D
E
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MA
B
AT
4. Securely engage the parking brake so that the tires do not turn.
5. Start the engine, then measure the line pressure at both idle and
the stall speed.
CAUTION:
lKeep the brake pedal pressed all the way down during
measurement.
lWhen measuring the line pressure at the stall speed.
Refer toAT-43, "
STALL TEST".
6. After the measurements are complete, install the oil pressure
detection plug and tighten to the specified torque. Refer toAT-
251, "Components".
CAUTION:
lDo not reuse O-ring.
lApply ATF to O-ring.
Line Pressure
Judgement of Line Pressure Test
SAT513G
SAT493G
Engine speedLine pressure [kPa (bar, kg/cm
2,psi)]
“R” position “D” position
At idle speed 425 - 465 (4.3 - 4.6, 4.3 - 4.7, 62 - 67) 379 - 428 (3.8 - 4.3, 3.9 - 4.4, 55 - 62)
At stall speed 1,605 - 1,950 (16.0 - 19.5, 16.4 - 19.9, 233 - 283) 1,310 - 1,500 (13.1 - 15.0, 13.4 - 15.3, 190 - 218)
Judgement Possible cause
Idle speedLow for all positions
(“P”, “R”, “N” and “D”)Possible causes include malfunctions in the pressure supply system and low oil pump output.
For example
lOil pump wear
lPressure regulator valve or plug sticking or spring fatigue
lOil strainer
oil pump
pressure regulator valve passage oil leak
lEngine idle speed too low
Only low for a specific
positionPossible causes include an oil pressure leak in a passage or device related to the position
after the pressure is distributed by the manual valve.
HighPossible causes include a sensor malfunction or malfunction in the line pressure adjustment
function.
For example
lAccelerator pedal position signal malfunction
lA/T fluid temperature sensor malfunction
lLine pressure solenoid malfunction (sticking in OFF state, filter clog, cut line)
lPressure regulator valve or plug sticking

AT-46
TROUBLE DIAGNOSIS
ROAD TEST
Description
lThe road test inspects overall performance of A/T and analyzes possible malfunction causes.
lThe road test is perform in the following three stages.
1. Check before engine is started. Refer toAT-46
.
2. Check at idle. Refer toAT-47
.
3. Cruise test.
lInspect all the items from Part 1 to Part 3. Refer toAT-48,AT-50,AT-51.
lBefore beginning the road test, check the test procedure and inspection items.
lTest all inspection items until the symptom is uncovered. Diagnose NG items when all road tests are com-
plete.
CheckBeforeEngineIsStartedECS00FX1
1.CHECK OD OFF INDICATOR LAMP
1. Park vehicle on level surface.
2. Move selector lever to “P” position.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON. (Do not start engine.)
Does OD OFF indicator lamp light up for about 2 seconds?
YES >> 1. Turn ignition switch OFF.
2. Perform self-diagnosis and record all NG items onAT-38, "
DIAGNOSTIC WORKSHEET".
Refer toAT-80, "
SELF-DIAGNOSTIC RESULT MODE",AT-89, "TCM SELF-DIAGNOSTIC
PROCEDURE (WITHOUT CONSULT-II)".
3. Go toAT-47, "
Check at Idle".
NO >> Stop the road test and go toAT- 1 7 7 , "
OD OFF Indicator Lamp Does Not Come On".
Stall speedOil pressure does not
rise higher than the oil
pressure for idle.Possible causes include a sensor malfunction or malfunction in the pressure adjustment
function.
For example
lAccelerator pedal position signal malfunction
lTCM malfunction
lLine pressure solenoid malfunction (shorting, sticking in ON state)
lPressure regulator valve or plug sticking
lPilot valve sticking or pilot filter clogged
The pressure rises, but
does not enter the stan-
dard position.Possible causes include malfunctions in the pressure supply system and malfunction in the
pressure adjustment function.
For example
lAccelerator pedal position signal malfunction
lLine pressure solenoid malfunction (sticking, filter clog)
lPressure regulator valve or plug sticking
lPilot valve sticking or pilot filter clogged
Only low for a specific
positionPossible causes include an oil pressure leak in a passage or device related to the position
after the pressure is distributed by the manual valve. Judgement Possible cause

AT-60
TROUBLE DIAGNOSIS
22
Slips/Will
Not
EngageWhen “D” position,
remains in 5th gear.ON vehicle1. A/T fluid level and stateAT- 4 3
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 3,
AT- 1 2 5
3. ATF pressure switch 1 and front brake solenoid valveAT- 1 5 6,
AT- 1 3 7
4. Line pressure testAT- 4 4
5. CAN communication lineAT- 9 1
6. Control valve with TCMAT- 2 1 8
OFF vehicle7. Front brake (brake band)AT- 2 6 38. Input clutchAT- 2 8 6
9. Gear systemAT- 2 5 1
10. High and low reverse clutchAT- 2 9 6
23Vehicle cannot be
started from D
1.
Refer toAT-186, "
Vehi-
cle Cannot Be Started
from D1".ON vehicle1. A/T fluid level and stateAT- 4 3
2. Accelerator pedal position sensorAT- 11 6
3. Line pressure testAT- 4 4
4. CAN communication lineAT- 9 1
5. Control valve with TCMAT- 2 1 8
OFF vehicle6. Torque converterAT- 2 6 3
7. Oil pump assemblyAT- 2 8 1
8. 3rd one-way clutchAT- 2 8 4
9. 1st one-way clutchAT- 2 9 1
10. Gear systemAT- 2 5 1
11. Reverse brakeAT- 2 6 3
12. Forward one-way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer toAT-
14, "Cross-Sectional View (2WD Models)",AT- 1 5 , "Cross-
Sectional View (4WD Models)".)AT- 2 6 3
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer toAT-14, "
Cross-
Sectional View (2WD Models)",AT-15, "Cross-Sectional View
(4WD Models)".)AT- 2 6 3
24Does not lock-up.
Refer toAT-196, "A/T
Does Not Perform
Lock-up".ON vehicle1. A/T fluid level and stateAT- 4 3
2. Line pressure testAT- 4 4
3. Engine speed signalAT- 1 0 8
4. Turbine revolution sensorAT- 1 2 3
5. Torque converter clutch solenoid valveAT- 11 0
6. CAN communication lineAT- 9 1
7. Control valve with TCMAT- 2 1 8
OFF vehicle8. Torque converterAT- 2 6 39. Oil pump assemblyAT- 2 8 1
No. Items Symptom Condition Diagnostic ItemReference
page

AT-62
TROUBLE DIAGNOSIS
28
Slips/Will
Not
EngageNo shock at all or the
clutch slips when vehi-
cle changes speed D2
®D3.ON vehicle1. A/T fluid level and stateAT- 4 3
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 3,
AT- 1 2 5
3. ATF pressure switch 6 and high and low reverse clutch
solenoid valveAT- 1 6 2,
AT- 1 4 7
4. CAN communication lineAT- 9 1
5. Line pressure testAT- 4 4
6. Control valve with TCMAT- 2 1 8
OFF vehicle7. Torque converterAT- 2 6 3
8. Oil pump assemblyAT- 2 8 1
9. 3rd one-way clutchAT- 2 8 4
10. Gear systemAT- 2 5 1
11. High and low reverse clutchAT- 2 9 6
12. Forward one-way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer toAT-
14, "Cross-Sectional View (2WD Models)",AT- 1 5 , "Cross-
Sectional View (4WD Models)".)AT- 2 6 3
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer toAT-14, "
Cross-
Sectional View (2WD Models)",AT-15, "Cross-Sectional View
(4WD Models)".)AT- 2 6 3
29No shock at all or the
clutch slips when vehi-
cle changes speed D3
®D4.ON vehicle1. A/T fluid level and stateAT- 4 3
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 3,
AT- 1 2 5
3. ATF pressure switch 3 and input clutch solenoid valveAT- 1 5 8,
AT- 1 3 2
4. ATF pressure switch 1 and front brake solenoid valveAT- 1 5 6,
AT- 1 3 7
5. CAN communication lineAT- 9 1
6. Line pressure testAT- 4 4
7. Control valve with TCMAT- 2 1 8
OFF vehicle8. Torque converterAT- 2 6 3
9. Oil pump assemblyAT- 2 8 1
10. Input clutchAT- 2 8 6
11. Gear systemAT- 2 5 1
12. High and low reverse clutchAT- 2 9 6
13. Direct clutchAT- 2 9 8
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-63
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30
Slips/Will
Not
EngageNo shock at all or the
clutch slips when vehi-
cle changes speed D4
®D5.ON vehicle1. A/T fluid level and stateAT- 4 3
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT-103,
AT-125
3. ATF pressure switch 1 and front brake solenoid valveAT-156,
AT-137
4. ATF pressure switch 5 and direct clutch solenoid valveAT-160,
AT-142
5. CAN communication lineAT- 9 1
6. Line pressure testAT- 4 4
7. Control valve with TCMAT-218
OFF vehicle8. Torque converterAT-263
9. Oil pump assemblyAT-281
10. Front brake (brake band)AT-263
11. Input clutchAT-286
12. Gear systemAT-251
13. High and low reverse clutchAT-296
31When you press the
accelerator pedal and
shift speed D5®D4
the engine idles or the
A/T slips.ON vehicle1. A/T fluid level and stateAT- 4 3
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT-103,
AT-125
3. ATF pressure switch 1 and front brake solenoid valveAT-156,
AT-137
4. ATF pressure switch 5 and direct clutch solenoid valveAT-160,
AT-142
5. CAN communication lineAT- 9 1
6. Line pressure testAT- 4 4
7. Control valve with TCMAT-218
OFF vehicle8. Torque converterAT-263
9. Oil pump assemblyAT-281
10. Input clutchAT-286
11. Gear systemAT-251
12. High and low reverse clutchAT-296
13. Direct clutchAT-298
No. Items Symptom Condition Diagnostic ItemReference
page