Infiniti Q45. Manual — part 34
TROUBLE DIAGNOSIS
AT-49
D
E
F
G
H
I
J
K
L
M
A
B
AT
A/T Electrical Parts Location
NCS000U9
SCIA5730E
AT-50
TROUBLE DIAGNOSIS
Circuit Diagram
NCS000UA
TCWM0300E
TROUBLE DIAGNOSIS
AT-51
D
E
F
G
H
I
J
K
L
M
A
B
AT
Inspections Before Trouble Diagnosis
NCS000UB
A/T FLUID CHECK
A/T Fluid Leakage and A/T Fluid Level Check
●
Inspect for A/T fluid leakage and check the A/T fluid level. Refer to
A/T Fluid Condition Check
Inspect the A/T 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 ATF. 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.
Fluid condition
Conceivable Cause
Required Operation
Varnished (viscous
varnish state)
Clutch, brake
scorched
Replace the ATF and check the A/T
main unit and the vehicle for mal-
functions (wire harnesses, cooler
pipes, etc.)
Milky white or
cloudy
Water in the fluid
Replace the ATF 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 ATF and check for
improper operation of the A/T.
SAT638A
SAT647B
SCIA7463E
SCIA5742E
AT-52
TROUBLE DIAGNOSIS
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 ATF.
CAUTION:
Run the engine at idle for at least 1 minute.
9.
Repeat steps 5 through 8 with selector lever in “R” position.
Judgement of 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
Stall speed:
2,300 - 2,600 rpm
SAT514G
SCIA5743E
Selector lever position
Possible location of malfunction
“D”, “M”
“R”
Stall speed
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” or “M” position 1
→
2
Slipping in 2nd, 3rd or 4th gear
Direct clutch slippage
Does not shift-up “D” or “M” position 2
→
3
Slipping in 3rd, 4th or 5th gear
High and low reverse clutch slippage
Does not shift-up “D” or “M” position 3
→
4
Slipping in 4th or 5th gear
Input clutch slippage
Does not shift-up “D” or “M” position 4
→
5
Slipping in 5th gear
Front brake slippage
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