Infiniti M45 (Y34). Manual — part 42
TROUBLE DIAGNOSIS
AT-53
D
E
F
G
H
I
J
K
L
M
A
B
AT
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
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 brake
L
L
●
Engine and torque converter one-way clutch
H
H
●
Line pressure low
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
AT-54
TROUBLE DIAGNOSIS
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.
3.
After warming up A/T, remove the oil pressure detection plug
and install the oil pressure gauge.
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 brake pedal 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 regulation torque below.
CAUTION:
●
Do not reuse O-ring.
●
Apply ATF to O-ring.
Line Pressure
SCIA5309E
SCIA1224E
: 7.3 N·m (0.74 kg-m, 65 in-lb)
SAT493G
Engine speed
Line pressure
kPa (kg/cm
2
, psi)
“R” position
“D”,“ M” positions
At idle speed
392 - 441 (4.0 - 4.5, 57 - 64)
373 - 422 (3.8 - 4.3, 54 - 61)
At stall speed
1,700 - 1,890 (17.3 - 19.3, 247 - 274)
1,310 - 1,500 (13.3 - 15.3, 190 - 218)
TROUBLE DIAGNOSIS
AT-55
D
E
F
G
H
I
J
K
L
M
A
B
AT
Judgement of Line Pressure Test
ROAD TEST
Description
●
The road test inspects 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. 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
complete.
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 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
Stall speed
Oil pressure does
not rise higher than
the oil pressure for
idle.
Possible causes include a sensor malfunction or malfunction in the line 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 posi-
tion.
Possible causes include malfunctions in the pressure supply system and malfunction in the line
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 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.
AT-56
TROUBLE DIAGNOSIS
Check Before Engine is Started
ACS004HR
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
>> GO TO 2.
NO
>> Stop the road test and go to
AT-256, "A/T CHECK Indicator Lamp Does Not Come On"
.
2.
CHECK A/T CHECK INDICATOR LAMP
Does A/T CHECK indicator lamp flash for about 8 seconds?
YES
>> For TCM fail-safe mode, carry out self-diagnostics and record all NG items on the diagnostics
worksheet. Refer to
NO
>> 1. Turn ignition switch OFF.
2. Perform self-diagnostics and record all NG items on the diagnostics worksheet. Refer to
.
Check at Idle
ACS004HS
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-258, "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 in “D”, “M” or “R” position.
3.
Start engine.
Does the engine start in any position?
YES
>> Stop the road test and go to
AT-258, "Engine Cannot Be Started In “P” or “N” Position"
.
NO
>> GO TO 3.
3.
CHECK “P” POSITION FUNCTION
1.
Move selector lever to “P” position.
2.
Turn ignition switch OFF.
3.
Release the parking brake.
4.
Push the vehicle forward or backward.
5.
Engage the parking brake.
Does vehicle move when it is pushed forward or backward?
YES
>> Enter a check mark at “Vehicle moves when pushed in “P” position” on the diagnostics worksheet,
then continue the road test.
NO
>> GO TO 4.
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