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 >
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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"
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
.
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
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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
AT-180, "Vehicle Cannot Be Started from D
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
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
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
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
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
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
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
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
on the “Diagnostic Worksheet
Chart”, then continue the road test.
6.
CHECK LOCK-UP
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