Infiniti Q45. Manual - part 34

TROUBLE DIAGNOSIS

AT-49

D

E

F

G

H

I

J

K

L

M

A

B

AT

A/T Electrical Parts Location

NCS000U9

SCIA5730E

AT-50

TROUBLE DIAGNOSIS

Circuit Diagram

NCS000UA

TCWM0300E

TROUBLE DIAGNOSIS

AT-51

D

E

F

G

H

I

J

K

L

M

A

B

AT

Inspections Before Trouble Diagnosis

NCS000UB

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

●

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

AT-13, "Checking A/T Fluid"

 .

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). Inspect the

amount of ATF. 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.

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 
places 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 
improper operation of the A/T.

SAT638A

SAT647B

SCIA7463E

SCIA5742E

AT-52

TROUBLE DIAGNOSIS

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.

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

Stall speed:

2,300 - 2,600 rpm

SAT514G

SCIA5743E

Selector lever position

Possible location of malfunction

“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