Infiniti Q45. Manual — part 35
TROUBLE DIAGNOSIS
AT-53
D
E
F
G
H
I
J
K
L
M
A
B
AT
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.
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.
4.
Securely engage the parking brake so that the tires do not turn.
5.
Start the engine, then measure the line pressure at both idle and
the stall speed.
CAUTION:
●
Keep the foot brake pressed all the way down during
measurement.
●
When measuring the line pressure at the stall speed,
refer to
6.
After the measurements are complete, install the oil pressure
detection plug and tighten to the specified torque.
CAUTION:
●
Do not reuse O-ring.
●
Apply ATF to O-ring.
SCIA5672E
SCIA5309E
SCIA7463E
:7.3 N·m (0.74 kg-m, 65 in-lb)
SAT493G
AT-54
TROUBLE DIAGNOSIS
Line Pressure
Judgement of Line Pressure Test
Engine speed
Line pressure
kPa (kg/cm
2
, psi)
“R” position
“D”, “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
Þ
oil pump
Þ
pressure regulator valve passage oil leak
●
Engine idle speed too low
Only low for a specific
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
function.
For example
●
Accelerator pedal position signal malfunction
●
A/T fluid temperature sensor malfunction
●
Line pressure solenoid malfunction (sticking in OFF state, filter clog, cut line)
●
Pressure regulator valve or plug sticking
Stall speed
Oil pressure does not
rise higher than the oil
pressure for idle.
Possible causes include a sensor malfunction or malfunction in the pressure adjustment func-
tion.
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 position.
Possible causes include malfunctions in the pressure supply system and malfunction in the
pressure 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 specific
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.
TROUBLE DIAGNOSIS
AT-55
D
E
F
G
H
I
J
K
L
M
A
B
AT
ROAD TEST
Description
●
The road test inspects overall performance of the A/T and analyzes possible malfunction causes.
●
The road test is performed out in the following three stages.
1.
Check before engine is started. Refer to
2.
Check at idle. Refer to
.
3.
Cruise test
–
Inspect all the items from Part 1 to Part 3. Refer to
.
●
Before beginning the road test, check the test 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
NCS000UC
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. (Do not start engine.)
Does A/T CHECK indicator lamp light up for about 2 seconds?
YES
>> 1. Turn ignition switch OFF.
2. Perform self-diagnostics and record all NG items on the
AT-87, "SELF-DIAGNOSTIC RESULT MODE"
AT-97, "Diagnostic Procedure without
3. Go to
NO
>> Stop the road test and go to
AT-183, "A/T CHECK Indicator Lamp Does Not Come On"
Check at Idle
NCS000UD
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-183, "Engine Cannot Be Started In “P” or “N” Position"
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 both positions?
YES
>> Stop the road test and go to
AT-183, "Engine Cannot Be Started In “P” or “N” Position"
NO
>> GO TO 3.
AT-56
TROUBLE DIAGNOSIS
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 “In “P” Position Vehicle Moves When Pushed” on the
, 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 “In “N” Position Vehicle Moves” on the
, 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 A/T is shifted from “N” to “D”, is there an excessive shock?
YES
>> Enter a check mark at “Large Shock (“N” to “D” Position)” on the
, 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 “Vehicle Does Not Creep Backward In “R” Position” on the
, 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
, and
NO
>> Enter a check mark at “Vehicle Does Not Creep Forward In “D” Position” on the
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