Infiniti FX35 / FX45. Manual - part 30

AT-48

< SERVICE INFORMATION >

TROUBLE DIAGNOSIS

A/T Electrical Parts Location

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JPDIA0419GB

TROUBLE DIAGNOSIS

AT-49

< SERVICE INFORMATION >

D

E

F

G

H

I

J

K

L

M

A

B

AT

N

O

P

Circuit Diagram

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Inspections Before Trouble Diagnosis

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A/T FLUID CHECK

A/T Fluid Leakage and A/T Fluid Level Check 

Check for A/T fluid leakage and check the A/T fluid level. Refer to 

AT-11, "Checking A/T Fluid"

.

TCWM0495E

AT-50

< SERVICE INFORMATION >

TROUBLE DIAGNOSIS

A/T Fluid Condition Check

Inspect the A/T fluid condition.

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). Check the

amount of ATF. Replenish if necessary.

3.

Securely engage the parking brake so that the tires do not turn.

4.

Start engine, 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 1 minute.

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

Stall speed

VQ35DE engine:

2,650 - 2,950 rpm

VK45DE engine:

2,260 - 2,560 rpm

SAT514G

TROUBLE DIAGNOSIS

AT-51

< SERVICE INFORMATION >

D

E

F

G

H

I

J

K

L

M

A

B

AT

N

O

P

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 

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 (122 to

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.

Remove the front propeller shaft from vehicle (with AWD models). Refer to 

PR-4, "Removal and Installa-

tion"

.

4.

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.

Selector lever position

Expected problem location

“D”, “M”

“R”

Stall speed 

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” or “M” position 1 

→

 2

Slipping in 2nd, 3rd or 4th gear

Direct clutch slippage

Does not shift-up “D” or “M” position 2 

→

 3

Slipping in 3rd, 4th or 5th gear

High and low reverse clutch slippage

Does not shift-up “D” or “M” position 3 

→

 4

Slipping in 4th or 5th gear

Input clutch slippage

Does not shift-up “D” or “M” position 4 

→

 5

Slipping in 5th gear

Front brake slippage

SCIA2187E

SCIA5309E