Infiniti QX56 (JA60). Manual — part 931
TM-26
< FUNCTION DIAGNOSIS >
A/T CONTROL SYSTEM
When shifting from the lock-up released state to the lock-up applied state, the current output to the torque con-
verter clutch solenoid is controlled with the TCM. In this way, when shifting to the lock-up applied state, the
torque converter clutch is temporarily set to the half-clutched state to reduce the shock.
Half-clutched State
• The current output from the TCM to the torque converter clutch solenoid is varied to gradually increase the
torque converter clutch solenoid pressure.
In this way, the lock-up apply pressure gradually rises and while the torque converter clutch piston is put into
half-clutched status, the torque converter clutch piston operating pressure is increased and the coupling is
completed smoothly.
Slip Lock-up Control
• In the slip region, the torque converter clutch solenoid current is controlled with the TCM to put it into the
half-clutched state. This absorbs the engine torque fluctuation and lock-up operates from low speed.
This raises the fuel efficiency for 4GR and 5GR at both low speed and when the accelerator has a low
degree of opening.
Engine Brake Control
INFOID:0000000005148516
• The forward one-way clutch transmits the drive force from the engine to the rear wheels. But the reverse
drive from the rear wheels is not transmitted to the engine because the one-way clutch is idling.
Therefore, the low coast brake solenoid is operated to prevent the forward one-way clutch from idling and
the engine brake is operated in the same manner as conventionally.
• The operation of the low coast brake solenoid switches the low coast brake switching valve and controls the
coupling and releasing of the low coast brake.
The low coast brake reducing valve controls the low coast brake coupling force.
Control Valve
INFOID:0000000005148517
FUNCTION OF CONTROL VALVE
SCIA1520E
Name
Function
Torque converter regulator valve
In order to prevent the pressure supplied to the torque converter from being excessive,
the line pressure is adjusted to the optimum pressure (torque converter operating pres-
sure).
Pressure regulator valve
Pressure regulator plug
Pressure regulator sleeve
Adjusts the oil discharged from the oil pump to the optimum pressure (line pressure) for
the driving state.
Front brake control valve
When the front brake is coupled, adjusts the line pressure to the optimum pressure (front
brake pressure) and supplies it to the front brake. (In 1GR, 2GR, 3GR, and 5GR, adjusts
the clutch pressure.)
Accumulator control valve
Adjusts the pressure (accumulator control pressure) acting on the accumulator piston
and low coast reducing valve to the pressure appropriate to the driving state.
A/T CONTROL SYSTEM
TM-27
< FUNCTION DIAGNOSIS >
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
FUNCTION OF PRESSURE SWITCH
Pilot valve A
Adjusts the line pressure and produces the constant pressure (pilot pressure) required
for line pressure control, shift change control, and lock-up control.
Pilot valve B
Adjusts the line pressure and produces the constant pressure (pilot pressure) required
for shift change control.
Low coast brake switching valve
During engine braking, supplies the line pressure to the low coast brake reducing valve.
Low coast brake reducing valve
When the low coast brake is coupled, adjusts the line pressure to the optimum pressure
(low coast brake pressure) and supplies it to the low coast brake.
N-R accumulator
Produces the stabilizing pressure for when N-R is selected.
Direct clutch piston switching valve
Operates in 4GR and switches the direct clutch coupling capacity.
High and low reverse clutch control valve
When the high and low reverse clutch is coupled, adjusts the line pressure to the opti-
mum pressure (high and low reverse clutch pressure) and supplies it to the high and low
reverse clutch. (In 1GR, 3GR, 4GR and 5GR, adjusts the clutch pressure.)
Input clutch control valve
When the input clutch is coupled, adjusts the line pressure to the optimum pressure (in-
put clutch pressure) and supplies it to the input clutch. (In 4GR and 5GR, adjusts the
clutch pressure.)
Direct clutch control valve
When the direct clutch is coupled, adjusts the line pressure to the optimum pressure (di-
rect clutch pressure) and supplies it to the direct clutch. (In 2GR, 3GR, and 4GR, adjusts
the clutch pressure.)
TCC control valve
TCC control plug
TCC control sleeve
Switches the lock-up to operating or released. Also, by performing the lock-up operation
transiently, lock-up smoothly.
Torque converter lubrication valve
Operates during lock-up to switch the torque converter, cooling, and lubrication system
oil path.
Cool bypass valve
Allows excess oil to bypass cooler circuit without being fed into it.
Line pressure relief valve
Discharges excess oil from line pressure circuit.
N-D accumulator
Produces the stabilizing pressure for when N-D is selected.
Manual valve
Sends line pressure to each circuit according to the select position. The circuits to which
the line pressure is not sent drain.
Name
Function
Name
Function
Pressure switch 2 (LC/B)
Detects any malfunction in the low coast brake hydraulic pressure. When it detects any
malfunction, it puts the system into fail-safe mode.
TM-28
< FUNCTION DIAGNOSIS >
A/T CONTROL SYSTEM
Component Parts Location
INFOID:0000000005148518
AWDIA0705GB
A/T SHIFT LOCK SYSTEM
TM-29
< FUNCTION DIAGNOSIS >
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
A/T SHIFT LOCK SYSTEM
System Description
INFOID:0000000005148519
• The selector lever cannot be shifted from “P” (Park) unless the brake pedal is applied and the ignition knob
switch is turned to the “ON” position.
• The ignition knob switch cannot be returned to the “OFF” position unless the selector lever is placed in “P”
(Park).
• The shift lock mechanism is controlled by the ON-OFF operation of the shift lock solenoid.
• The key switch and ignition knob switch lock mechanism is controlled by the ON-OFF operation of the key
lock solenoid.
Component Parts Location
INFOID:0000000005148520
1.
Emergency lever
2.
Key lock solenoid
3.
Ignition knob switch
4.
Shift lock control unit
5.
Shift lock solenoid
6.
Park position switch
7.
Shift lock release
8.
Stop lamp switch
AWDIA0706ZZ
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