Infiniti F50. Manual - part 41

 

  Index      Infiniti     Infiniti F50 - service repair manual 2006 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  39  40  41  42   ..

 

 

Infiniti F50. Manual - part 41

 

 

TROUBLE DIAGNOSIS

AT-49

D

E

F

G

H

I

J

K

L

M

A

B

AT

A/T Electrical Parts Location

ECS00836

SCIA0502E

AT-50

TROUBLE DIAGNOSIS

Circuit Diagram

ECS00837

TCWM0051E

TROUBLE DIAGNOSIS

AT-51

D

E

F

G

H

I

J

K

L

M

A

B

AT

Inspections Before Trouble Diagnosis

ECS00838

A/T FLUID CHECK
Fluid leakage and fluid level check 

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

AT-14, "Checking A/T Fluid"

 .

Fluid condition check

Inspect the 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). Inspect the

amount of A/T fluid. Replenish if necessary.

3.

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

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 A/T fluid.

Fluid status

Conceivable Cause

Required Operation

Varnished (viscous 
varnish state)

Clutch, brake 
scorched

Replace the A/T fluid and check the 
A/T main unit and the vehicle for 
malfunctions (wire harnesses, 
cooler pipes, etc.)

Milky white or 
cloudy

Water in the fluid

Replace the A/T fluid and check for 
places where water is getting in.

Large amount of 
metal powder mixed 
in

Unusual wear of 
sliding parts within 
A/T

Replace the A/T fluid and check for 
improper operation of the A/T.

SAT638A

SAT647B

SCIA1224E

SAT514G

AT-52

TROUBLE DIAGNOSIS

CAUTION:

Run the engine at idle for at least one minute.

Judgement 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 A/T fluid reaches in range of 50 to 80

°

C (122

to 176

°

F), then inspect the amount of A/T fluid 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.

Stall speed:

2,300 - 2,600 rpm

Selector lever position

Expected problem location

D, M

R

Stall rotation 

H

O

Forward brake

Forward one-way clutch

1st one-way clutch

3rd one-way clutch

O

H

Reverse clutch

L

L

Engine and torque converter one-way clutch

H

H

 Line pressure low

O

O

One-way clutch in torque converter stuck or check with another item tests

Does not shift up D, M position 1 

 2

Slipping in 2nd, 3rd, 4th gears

Direct clutch slippage

Does not shift up D, M position 2 

 3

Slipping in 3rd, 4th, 5th gears

High and low reverse clutch slippage

Does not shift up D, M position 3 

 4

Slipping in 4th, 5th gears

Input clutch slippage

Does not shift up D, M position 4 

 5

Slipping in 5th gear

Front brake slippage

PCIA0017E

 

 

 

 

 

 

 

Content   ..  39  40  41  42   ..