Infiniti F50. Manual — part 41
TROUBLE DIAGNOSIS
AT-49
D
E
F
G
H
I
J
K
L
M
A
B
AT
A/T Electrical Parts Location
ECS00836
SCIA0502E
AT-50
TROUBLE DIAGNOSIS
Circuit Diagram
ECS00837
TCWM0051E
TROUBLE DIAGNOSIS
AT-51
D
E
F
G
H
I
J
K
L
M
A
B
AT
Inspections Before Trouble Diagnosis
ECS00838
A/T FLUID CHECK
Fluid leakage and fluid level check
●
Inspect for fluid leakage and check the fluid level. Refer to
Fluid condition check
Inspect the 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 A/T fluid. 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.
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 A/T fluid.
Fluid status
Conceivable Cause
Required Operation
Varnished (viscous
varnish state)
Clutch, brake
scorched
Replace the A/T fluid and check the
A/T main unit and the vehicle for
malfunctions (wire harnesses,
cooler pipes, etc.)
Milky white or
cloudy
Water in the fluid
Replace the A/T fluid 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 A/T fluid and check for
improper operation of the A/T.
SAT638A
SAT647B
SCIA1224E
SAT514G
AT-52
TROUBLE DIAGNOSIS
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
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.
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 clutch
L
L
●
Engine and torque converter one-way clutch
H
H
●
Line pressure low
O
O
●
One-way clutch in torque converter stuck or check with another item tests
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
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