Nissan Xterra. Manual — part 677

INSPECTIONS BEFORE TROUBLE DIAGNOSIS

TM-221

< PERIODIC MAINTENANCE >

[5AT: RE5R05A]

C

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INSPECTIONS BEFORE TROUBLE DIAGNOSIS

Fluid Condition Check

INFOID:0000000009485593

A/T FLUID CHECK

Fluid Leakage and Fluid Level Check

• Inspect for fluid leakage and check the fluid level. Refer to

TM-215, "Checking the A/T Fluid (ATF)"

.

Fluid Condition Check

Inspect the fluid condition.

Stall Test

INFOID:0000000009485594

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

TM-222

< PERIODIC MAINTENANCE >

[5AT: RE5R05A]

INSPECTIONS BEFORE TROUBLE DIAGNOSIS

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.

Judgment 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

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LINE PRESSURE TEST

Line Pressure Test Port

Line Pressure Test Procedure

1. Inspect the amount of engine oil and replenish if necessary.

Stall speed:

TM-327, "Stall Speed"

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 2GR, 3GR, 4GR

Direct clutch slippage

Does not shift-up D position 2

→ 3

Slipping in 3GR, 4GR, 5GR

High and low reverse clutch slippage

Does not shift-up D position 3

→ 4

Slipping in 4GR, 5GR

Input clutch slippage

Does not shift-up D position 4

→ 5

Slipping in 5GR

Front brake slippage

SCIA2187E

INSPECTIONS BEFORE TROUBLE DIAGNOSIS

TM-223

< PERIODIC MAINTENANCE >

[5AT: RE5R05A]

C

E

F

G

H

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J

K

L

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A

B

TM

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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

Judgment of Line Pressure Test

SCIA5309E

SCIA7463E

The oil pressure detection
plug

: 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

TM-327, "Line Pressure"

At stall speed

TM-224

< PERIODIC MAINTENANCE >

[5AT: RE5R05A]

INSPECTIONS BEFORE TROUBLE DIAGNOSIS

Judgment 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.