Infiniti QX4 (R50). Manual — part 5
CLUTCH AND BAND CHART
NBAT0012S03
Shift position
Reverse
clutch
High
clutch
For-
ward
clutch
Over-
run
clutch
Band servo
For-
ward
one
-way
clutch
Low
one-
way
clutch
Low &
reverse
brake
Lock-up
Remarks
2nd
apply
3rd
release
4th
apply
P
PARK
POSITION
R
q
q
REVERSE
POSITION
N
NEUTRAL
POSITION
D*4
1st
q
*1D
B
B
Automatic
shift
1
k
2
k
3
k
4
2nd
q
*1A
q
B
3rd
q
q
*1A
*2C
C
B
*5
q
4th
q
C
*3C
C
q
q
2
1st
q
D
B
B
Automatic
shift
1
k
2
2nd
q
*1A
q
B
1
1st
q
q
B
q
Locks (held
stationary) in
1st speed
1
g
2
2nd
q
q
q
B
*1: Operates when overdrive control switch is being set in “OFF” position.
*2: Oil pressure is applied to both 2nd “apply” side and 3rd “release” side of band servo piston. However, brake band does not contract
because oil pressure area on the “release” side is greater than that on the “apply” side.
*3: Oil pressure is applied to 4th “apply” side in condition *2 above, and brake band contracts.
*4: A/T will not shift to 4th when overdrive control switch is set in “OFF” position.
*5: Operates when overdrive control switch is “OFF”.
q
: Operates.
A: Operates when throttle opening is less than 3/16, activating engine brake.
B: Operates during “progressive” acceleration.
C: Operates but does not affect power transmission.
D: Operates when throttle opening is less than 3/16, but does not affect engine brake.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-17
POWER TRANSMISSION
=NBAT0012S04
“N” and “P” Positions
NBAT0012S0401
I
“N” position
No control members operate. Power from the input shaft is not transmitted to the output shaft since the
clutch does not operate.
I
“P” position
Similar to the “N” position, no control members operate. The parking pawl interconnected with the select
lever engages with the parking gear to mechanically hold the output shaft so that the power train is locked.
SAT039J
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-18
“1
1
” Position
=NBAT0012S0406
Forward clutch
Forward one-way clutch
Overrun clutch
Low and reverse brake
As overrun clutch engages, rear internal gear is locked by the operation of low and
reverse brake.
This is different from that of D
1
and 2
1
.
Engine brake
Overrun clutch always engages, therefore engine brake can be obtained when decelerat-
ing.
SAT100J
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-19
“D
1
” and “2
1
” Positions
=NBAT0012S0402
Forward one-way clutch
Forward clutch
Low one-way clutch
Rear internal gear is locked to rotate counterclockwise because of the functioning of
these three clutches. (Start-up at D
1
)
Overrun clutch
engagement conditions
(Engine brake)
D
1
: Overdrive control switch in “OFF”
Throttle opening less than 3/16
2
1
: Throttle opening less than 3/16
At D
1
and 2
1
positions, engine brake is not activated due to free turning of low one-way
clutch.
SAT096J
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-20
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