Infiniti FX35 / FX45. Manual - part 31

 

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Infiniti FX35 / FX45. Manual - part 31

 

 

AT-52

< SERVICE INFORMATION >

TROUBLE DIAGNOSIS

5.

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

6.

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". 

7.

After the measurements are complete, install the oil pressure
detection plug and tighten to the specified torque.

CAUTION:

•  Do not reuse the O-ring.
•  Apply ATF to the O-ring.

Line Pressure

Judgement of Line Pressure Test

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” and “M” positions

At idle speed

425 - 465 (4.3 - 4.7, 62 - 67)

379 - 428 (3.9 - 4.4, 55 - 62)

At stall speed

1,605 - 1,950 (16.4 - 19.9, 233 - 283)

1,310 - 1,500 (13.4 - 15.3, 190 - 218)

Judgement Possible 

cause

Idle speed

Low for all positions 
(“P”, “R”, “N”, “D”, 
“M”)

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

TROUBLE DIAGNOSIS

AT-53

< SERVICE INFORMATION >

D

E

F

G

H

I

J

K

L

M

A

B

AT

N

O

P

Road Test

INFOID:0000000001425855

DESCRIPTION

• The road test checks overall performance of the A/T and analyzes possible malfunction causes.
• The road test is carried out in the following three stages.

1.

Check before engine is started.

2.

Check at idle.

3.

Cruise test
• Inspect all the items Part 1 to Part 3.

• Before beginning the road test, check the procedure and inspection items.
• Test all inspection items until the symptom is uncovered. Diagnose NG items when all road tests are com-

plete.

CHECK BEFORE ENGINE IS STARTED

1.

CHECK A/T CHECK INDICATOR LAMP

1.

Park vehicle on level surface.

2.

Move selector lever to “P” position.

3.

Turn ignition switch OFF and wait at least 10 seconds.

4.

Turn ignition switch ON.

Does A/T CHECK indicator lamp light up for about 2 seconds?

YES - 1>>

 With CONSULT-III

1.

Perform self-diagnostics and record all NG items on the “Diagnostic Worksheet Chart”. 

2.

Go to “CHECK AT IDLE”.

YES - 2>>

 Without CONSULT-III

1.

Perform self-diagnostics and record all NG items on the “Diagnostic Worksheet Chart”. Refer
to 

AT-91, "Diagnosis Procedure without CONSULT-III"

.

2.

Go to “CHECK AT IDLE”.

NO

>> Stop the road test and go to 

AT-170, "A/T Check Indicator Lamp Does Not Come On"

.

CHECK AT IDLE

1.

CHECK STARTING THE ENGINE

1.

Park vehicle on level surface.

2.

Move selector lever to “P” or “N” position.

3.

Turn ignition switch OFF.

4.

Start engine.

Does the engine start?

YES

>> GO TO 2.

NO

>> Stop the road test and go to 

AT-170, "Engine Cannot Be Started in "P" or "N" Position"

.

Stall speed

Line pressure does 
not rise higher than 
the line 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.

Judgement Possible 

cause

AT-54

< SERVICE INFORMATION >

TROUBLE DIAGNOSIS

2.

CHECK STARTING THE ENGINE

1.

Turn ignition switch ON. (Do not start engine.)

2.

Move selector lever to “D”, “M” or “R” position.

3.

Start engine.

Does the engine start in either position?

YES

>> Stop the road test and go to 

AT-170, "Engine Cannot Be Started in "P" or "N" Position"

.

NO

>> GO TO 3.

3.

CHECK “P” POSITION FUNCTIONS

1.

Move selector lever to “P” position.

2.

Turn ignition switch OFF.

3.

Disengage the parking brake.

4.

Push the vehicle forward or backward.

5.

Engage the parking brake.

When you push the vehicle with disengaging the parking brake, does it move?

YES

>> Enter a check mark at 

AT-171, "In "P" Position, Vehicle Moves When Pushed"

 on the “Diagnostic

Worksheet Chart”, then continue the road test.

NO

>> GO TO 4. 

4.

CHECK “N” POSITION FUNCTIONS

1.

Start engine.

2.

Move selector lever to “N” position.

3.

Disengage the parking brake.

Does vehicle move forward or backward?

YES

>> Enter a check mark at 

AT-172, "In "N" Position, Vehicle Moves"

 on the “Diagnostic Worksheet

Chart”, then continue the road test. 

NO

>> GO TO 5.

5.

CHECK SHIFT SHOCK

1.

Engage the brake.

2.

Move selector lever to “D” position.

When the transmission is shifted from “N” to “D”, is there an excessive shock?

YES

>> Enter a check mark at 

AT-173, "Large Shock ("N" to "D" Position)"

on the “Diagnostic Worksheet

Chart”, then continue the road test.

NO

>> GO TO 6.

6.

CHECK “R” POSITION FUNCTIONS

1.

Engage the brake.

2.

Move selector lever to “R” position.

3.

Disengage the brake for 4 to 5 seconds.

Does the vehicle creep backward?

YES

>> GO TO 7.

NO

>> Enter a check mark at 

AT-175, "Vehicle Does Not Creep Backward in "R" Position"

 on the “Diag-

nostic Worksheet Chart”, then continue the road test.

7.

CHECK “D” POSITION FUNCTIONS 

Inspect whether the vehicle creep forward when the A/T is put into the “D” position.

Does the vehicle creep forward in the “D” position?

YES

>> Go to 

AT-53, "Road Test"

.

NO

>> Enter a check mark at 

AT-178, "Vehicle Does Not Creep Forward in "D" Position"

on the “Diagnos-

tic Worksheet Chart”, then continue the road test. 

CRUISE TEST - PART 1

1.

CHECK STARTING OUT FROM D

1

1.

Drive the vehicle for about 10 minutes to warm up the engine oil and ATF.
Appropriate temperature for the ATF: 50 to 80

°

C (122 to 176

°

F)

TROUBLE DIAGNOSIS

AT-55

< SERVICE INFORMATION >

D

E

F

G

H

I

J

K

L

M

A

B

AT

N

O

P

2.

Park the vehicle on a level surface.

3.

Move selector lever to “P” position.

4.

Start the engine.

5.

Move selector lever to “D” position.

6.

Press the accelerator pedal about half-way down to accelerate the vehicle.

With CONSULT-III

Read the gear positions. Refer to 

AT-84, "CONSULT-III Function (TRANSMISSION)"

.

Starts from D

1

?

YES

>> GO TO 2.

NO

>> Enter a check mark at 

AT-180, "Vehicle Cannot Be Started from D

1

"

 on the “Diagnostic Worksheet

Chart”, then continue the road test.

2.

CHECK SHIFT-UP D

1

 

 D

2

Press down the accelerator pedal about half-way and inspect if the vehicle shifts up (D

1

 

 D

2

) at the appropri-

ate speed. Refer to 

AT-58, "Vehicle Speed at Which Gear Shifting Occurs"

.

With CONSULT-III

Read the gear position, throttle degree of opening, and vehicle speed. Refer to 

AT-84, "CONSULT-III Function

(TRANSMISSION)"

.

Does the A/T shift-up D

1

 

 D

2

 at the correct speed?

YES

>> GO TO 3.

NO

>> Enter a check mark at 

AT-182, "A/T Does Not Shift: D

1

  D

2

"

 on the “Diagnostic Worksheet

Chart”, then continue the road test.

3.

CHECK SHIFT-UP D

2

 

 D

3

Press down the accelerator pedal about half-way and inspect if the vehicle shifts up (D

2

 

 D

3

) at the appropri-

ate speed. Refer to 

AT-58, "Vehicle Speed at Which Gear Shifting Occurs"

.

With CONSULT-III

Read the gear position, throttle degree of opening, and vehicle speed. Refer to 

AT-84, "CONSULT-III Function

(TRANSMISSION)"

.

Does the A/T shift-up D

2

 

 D

3

 at the correct speed?

YES

>> GO TO 4.

NO

>> Enter a check mark at 

AT-184, "A/T Does Not Shift: D

2

  D

3

"

 on the “Diagnostic Worksheet

Chart”, then continue the road test.

4.

CHECK SHIFT-UP D

3

 

 D

4

Press down the accelerator pedal about half-way and inspect if the vehicle shifts up (D

3

 

 D

4

) at the appropri-

ate speed. Refer to 

AT-58, "Vehicle Speed at Which Gear Shifting Occurs"

.

With CONSULT-III

Read the gear position, throttle degree of opening, and vehicle speed. Refer to 

AT-84, "CONSULT-III Function

(TRANSMISSION)"

.

Does the A/T shift-up D

3

 

 D

4

 at the correct speed?

YES

>> GO TO 5.

NO

>> Enter a check mark at 

AT-186, "A/T Does Not Shift: D

3

  D

4

"

 on the “Diagnostic Worksheet

Chart”, then continue the road test.

5.

CHECK SHIFT-UP D

4

 

 D

5

Press down the accelerator pedal about half-way and inspect if the vehicle shifts up (D

4

 

 D

5

) at the appropri-

ate speed. Refer to 

AT-58, "Vehicle Speed at Which Gear Shifting Occurs"

.

With CONSULT-III

Read the gear position, throttle degree of opening, and vehicle speed. Refer to 

AT-84, "CONSULT-III Function

(TRANSMISSION)"

.

Does the A/T shift-up D

4

 

 D

5

 at the correct speed?

YES

>> GO TO 6.

NO

>> Enter a check mark at 

AT-188, "A/T Does Not Shift: D

4

  D

5

"

 on the “Diagnostic Worksheet

Chart”, then continue the road test.

6.

CHECK LOCK-UP 

 

 

 

 

 

 

 

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