Nissan Pathfinder (2008 year). Manual — part 605
TM-182
< ON-VEHICLE MAINTENANCE >
A/T FLUID
Changing the A/T Fluid (ATF)
INFOID:0000000001282726
CAUTION:
If using the vehicle for towing, the A/T fluid must be replaced as specified. Refer to
.
1.
Drive the vehicle to warm up the A/T fluid to approximately 80
°
C (176
°
F).
2.
Stop the engine.
3.
Remove the A/T fluid level gauge.
4.
Drain the A/T fluid from the drain plug hole, then install the drain
plug with a new gasket. Refill the transmission with new A/T
fluid. Always refill with the same volume as the drained A/T fluid.
Use the A/T fluid level gauge to check the A/T fluid level as
shown. Add A/T fluid as necessary.
• To flush out the old A/T fluid from the transmission oil coolers, pour new A/T fluid into the A/T fluid charg-
ing pipe with the engine idling and at the same time drain the old A/T fluid from the auxiliary transmis-
sion oil cooler hose return line.
• When the color of the A/T fluid coming out of the auxiliary transmission oil cooler hose return line is
about the same as the color of the new A/T fluid, flushing out the old A/T fluid is complete. The amount
of new A/T fluid used for flushing should be 30% to 50% of the specified capacity.
CAUTION:
• Use only Genuine NISSAN Matic J ATF and do not mix with other fluids.
• Using A/T fluid other than Genuine NISSAN Matic J ATF will cause deterioration in driveability
and automatic transmission durability, and may damage the automatic transmission, which is
not covered by the warranty.
• When filling the transmission with A/T fluid, do not spill the A/T fluid on any heat generating
parts such as the exhaust manifold.
• Do not reuse the drain plug gasket.
5.
Install the A/T fluid level gauge and tighten the A/T fluid level gauge bolt to specification.
6.
Drive the vehicle to warm up the A/T fluid to approximately 80
°
C (176
°
F).
7.
Check the fluid level and condition. If the A/T fluid is still dirty,
repeat steps 2 through 6.
8.
Install the A/T fluid level gauge in the A/T fluid charging pipe and install the A/T fluid level gauge bolt.
9.
Tighten the A/T fluid level gauge bolt to specification.
Drain plug
: Refer to
LLIA0071E
A/T fluid grade and capacity
: Refer to
MA-10, "Fluids and Lubricants"
A/T fluid level gauge bolt
: Refer to
(4WD).
LLIA0071E
A/T FLUID
TM-183
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A/T Fluid Cooler Cleaning
INFOID:0000000001282727
Whenever an A/T is repaired, overhauled, or replaced, the A/T fluid cooler mounted in the radiator must be
inspected and cleaned.
Metal debris and friction material, if present, can become trapped in the A/T fluid cooler. This debris can con-
taminate the newly serviced A/T or, in severe cases, can block or restrict the flow of A/T fluid. In either case,
malfunction of the newly serviced A/T may result.
Debris, if present, may build up as A/T fluid enters the cooler inlet. It will be necessary to back flush the cooler
through the cooler outlet in order to flush out any built up debris.
A/T FLUID COOLER CLEANING PROCEDURE
1.
Position a drain pan under the A/T inlet and outlet fluid cooler tube to cooler hose connection.
2.
Put a different color matching mark on each cooler tube to cooler hose connection to aid in assembly.
CAUTION:
Use paint to make the matching mark. Do not damage the tubes or hose.
3.
Disconnect the fluid cooler inlet and outlet rubber hoses from the
steel cooler tubes.
NOTE:
Replace the cooler hoses if rubber material from the hose
remains on the tube fitting.
4.
Drain any A/T fluid from the cooler hose.
5.
Insert the extension adapter hose of a can of Transmission
Cooler Cleaner (Nissan P/N 999MP-AM006) into the cooler out-
let hose.
CAUTION:
• Wear safety glasses and rubber gloves when spraying the
Transmission Cooler Cleaner.
• Spray cooler cleaner only with adequate ventilation.
• Avoid contact with eyes and skin.
• Do not breath vapors or spray mist.
6.
Hold the hose and can as high as possible and spray Transmis-
sion Cooler Cleaner in a continuous stream into the cooler outlet
hose until fluid flows out of the cooler inlet hose for 5 seconds.
7.
Insert the tip of an air gun into the end of the cooler outlet hose.
8.
Wrap a shop rag around the tip of the air gun and the cooler out-
let hose.
9.
Blow compressed air regulated to 5 - 9 kg/cm
2
(70 - 130 psi) through the cooler outlet hose for 10 seconds
to force out any remaining fluid.
A/T fluid level gauge bolt
: Refer to
(4WD).
SCIA3830E
SCIA3831E
SCIA3832E
TM-184
< ON-VEHICLE MAINTENANCE >
A/T FLUID
10. Repeat steps 5 through 9 three additional times.
11. Position an oil pan under the banjo bolts that connect the fluid cooler tubes to the A/T.
12. Remove the banjo bolts.
13. Flush each steel line from the cooler side back toward the A/T by spraying Transmission Cooler Cleaner
in a continuous stream for 5 seconds.
14. Blow compressed air regulated to 5 - 9 kg/cm
2
(70 - 130 psi) through each steel line from the cooler side
back toward the A/T for 10 seconds to force out any remaining fluid.
15. Ensure all debris is removed from the steel cooler lines.
16. Ensure all debris is removed from the banjo bolts and fittings.
17. Perform "A/T FLUID COOLER DIAGNOSIS PROCEDURE".
A/T FLUID COOLER DIAGNOSIS PROCEDURE
NOTE:
Insufficient cleaning of the cooler inlet hose exterior may lead to inaccurate debris identification.
1.
Position a drain pan under the A/T inlet and outlet fluid cooler tube to cooler hose connection.
2.
Clean the exterior and tip of the cooler inlet hose.
3.
Put a different color matching mark on each cooler tube to cooler hose connection to aid in assembly.
CAUTION:
Use paint to make the matching mark. Do not damage the tubes or hose.
4.
Disconnect the fluid cooler inlet and outlet rubber hoses from the
steel cooler tubes.
NOTE:
Replace the cooler hoses if rubber material from the hose
remains on the tube fitting.
5.
Insert the extension adapter hose of a can of Transmission
Cooler Cleaner (Nissan P/N 999MP-AM006) into the cooler out-
let hose.
CAUTION:
• Wear safety glasses and rubber gloves when spraying the
Transmission Cooler Cleaner.
• Spray cooler cleaner only with adequate ventilation.
• Avoid contact with eyes and skin.
• Do not breath vapors or spray mist.
6.
Hold the hose and can as high as possible and spray Transmis-
sion Cooler Cleaner in a continuous stream into the cooler outlet
hose until fluid flows out of the cooler inlet hose for 5 seconds.
7.
Tie a common white, basket-type coffee filter to the end of the
cooler inlet hose.
SCIA3830E
SCIA3831E
SCIA3833E
A/T FLUID
TM-185
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8.
Insert the tip of an air gun into the end of the cooler outlet hose.
9.
Wrap a shop rag around the air gun tip and end of cooler outlet
hose.
10. Blow compressed air regulated to 5 - 9 kg/cm
2
(70 - 130 psi)
through the cooler outlet hose to force any remaining A/T fluid
into the coffee filter.
11. Remove the coffee filter from the end of the cooler inlet hose.
12. Perform A/T fluid cooler inspection. Refer to
A/T FLUID COOLER INSPECTION PROCEDURE
1.
Inspect the coffee filter for debris.
a.
If small metal debris less than 1mm (0.040 in) in size or metal
powder is found in the coffee filter, this is normal. If normal
debris is found, the A/T fluid cooler/radiator can be re-used and
the procedure is ended.
b.
If one or more pieces of debris are found that are over 1mm
(0.040 in) in size and/or peeled clutch facing material is found in
the coffee filter, the fluid cooler is not serviceable. The A/T fluid
cooler/radiator must be replaced and the inspection procedure is
ended. Refer to
CO-16, "Removal and Installation"
(VQ40DE)
CO-43, "Removal and Installation"
for (VK56DE).
A/T FLUID COOLER FINAL INSPECTION
After performing all procedures, ensure that all remaining oil is cleaned from all components.
SCIA3834E
SCIA2967E
SCIA5659E
TM-186
< ON-VEHICLE MAINTENANCE >
INSPECTIONS BEFORE TROUBLE DIAGNOSIS
INSPECTIONS BEFORE TROUBLE DIAGNOSIS
Fluid Condition Check
INFOID:0000000001713131
A/T FLUID CHECK
Fluid Leakage and Fluid Level Check
• Inspect for fluid leakage and check the fluid level. Refer to
TM-182, "Changing the A/T Fluid (ATF)"
Fluid Condition Check
Inspect the fluid condition.
Stall Test
INFOID:0000000001713133
STALL TEST
Stall Test Procedure
1.
Inspect the amount of engine oil. Replenish the engine oil if necessary.
2.
Drive for about 10 minutes to warm up the vehicle so that the A/
T fluid temperature is 50 to 80
°
C (122 to 176
°
F). Inspect the
amount of ATF. Replenish if necessary.
3.
Securely engage the parking brake so that the tires do not turn.
Fluid condition
Conceivable Cause
Required Operation
Varnished (viscous
varnish state)
Clutch, brake
scorched
Replace 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 fluid
Replace 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
SAT647B
SCIA7463E
INSPECTIONS BEFORE TROUBLE DIAGNOSIS
TM-187
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4.
Engine start, apply foot brake, and place selector lever in “D”
position.
5.
While holding down the foot brake, gradually press down the
accelerator pedal.
6.
Quickly read off the stall speed, then quickly remove your foot
from the accelerator pedal.
CAUTION:
Do not hold down the accelerator pedal for more than 5 sec-
onds during this test.
7.
Move the selector lever to the “N” position.
8.
Cool down the ATF.
CAUTION:
Run the engine at idle for at least one minute.
9.
Repeat steps 5 through 8 with selector lever in “R” position.
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
INFOID:0000000001713134
LINE PRESSURE TEST
Line Pressure Test Port
Line Pressure Test Procedure
1.
Inspect the amount of engine oil and replenish if necessary.
Stall speed:
2,200 - 2,500 rpm
SAT514G
Selector lever position
Expected problem location
D
R
Stall rotation
H
O
• Forward brake
• Forward one-way clutch
• 1st one-way clutch
• 3rd one-way clutch
O
H
• Reverse brake
L
L
• Engine and torque converter one-way clutch
H
H
• Line pressure low
Does not shift-up D position 1
→
2
Slipping in 2nd, 3rd, 4th gears
Direct clutch slippage
Does not shift-up D position 2
→
3
Slipping in 3rd, 4th, 5th gears
High and low reverse clutch slippage
Does not shift-up D position 3
→
4
Slipping in 4th, 5th gears
Input clutch slippage
Does not shift-up D position 4
→
5
Slipping in 5th gear
Front brake slippage
SCIA2187E
TM-188
< ON-VEHICLE MAINTENANCE >
INSPECTIONS BEFORE TROUBLE DIAGNOSIS
2.
Drive the car for about 10 minutes to warm it up so that the ATF reaches in range of 50 to 80
°
C (122 to
176
°
F), then inspect the amount of ATF and replenish if necessary.
NOTE:
The automatic 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(J-34301-C)].
CAUTION:
When using the oil pressure gauge, be sure to use the O-
ring attached to the oil pressure detection plug.
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:
• Keep the brake pedal pressed all the way down during
measurement.
• When measuring the line pressure at the stall speed, refer
to "STALL TEST".
6.
After the measurements are complete, install the oil pressure
detection plug and tighten to the regulation torque below.
CAUTION:
• Do not reuse the O-ring.
• Apply ATF to O-ring.
Line Pressure
Judgement of Line Pressure Test
SCIA5309E
SCIA7463E
:7.3 N·m (0.74 kg-m, 65 in-lb)
SAT493G
Engine speed
Line pressure [kPa (kg/cm
2
, psi)]
“R” position
“D” position
At idle speed
425-465 (4.3 - 4.7, 62 - 67)
379 - 428 (3.9 - 4.4, 55 - 62)
At stall speed
1,605 - 1,905 (16.4 - 19.9, 233 - 283)
1,310 - 1,500 (13.4 - 15.3, 190 - 218)
INSPECTIONS BEFORE TROUBLE DIAGNOSIS
TM-189
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Judgement Possible
cause
Idle speed
Low for all positions
(P, R, N, D)
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 spe-
cific 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 func-
tion.
For example
• Accelerator pedal position signal malfunction
• ATF temperature sensor malfunction
• Line pressure solenoid malfunction (sticking in “OFF” state, filter clog, cut line)
• Pressure regulator valve or plug sticking
Stall speed
Oil 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
• Accelerator pedal position signal malfunction
• TCM breakdown
• Line pressure solenoid malfunction (shorting, sticking in“ ON” state)
• Pressure regulator valve or plug sticking
• Pilot valve sticking or pilot filter clogged
The pressure rises,
but does not enter
the standard posi-
tion.
Possible causes include malfunctions in the pressure supply system and malfunction in the pres-
sure adjustment function.
For example
• Accelerator pedal position signal malfunction
• Line pressure solenoid malfunction (sticking, filter clog)
• Pressure regulator valve or plug sticking
• Pilot valve sticking or pilot filter clogged
Only low for a spe-
cific 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.
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