Infiniti QX4 (R50). Manual — part 563
Location of Electrical Parts
NBTF0008
SMT959D
ALL-MODE 4WD SYSTEM
Location of Electrical Parts
TF-14
Description of Electrical Parts
NBTF0067
TRANSFER MOTOR
NBTF0067S01
1. The transfer motor drives the sub-oil pump to provide proper lubrication and oil pressure control when the
vehicle is at standstill, during low-speed operations or is being driven in reverse.
2. The main oil pump is operated by the driving force of the mainshaft. In other words, sufficient oil pressure
buildup does not occur when the vehicle is at standstill or during low-speed operations. While the vehicle
is being driven in reverse, the main oil pump rotates in the reverse direction. Therefore the main oil pump
does not discharge oil pressure. During any of the above vehicle operations, the transfer motor drives the
sub-oil pump to compensate for insufficient oil pressure.
3. The transfer motor operates as follows:
1) The motor relay turns OFF in the 2WD mode.
2) The motor relay operates as described in the table below in modes other than the 2WD mode.
Table 1
PNP switch “R” position
VFF (Vehicle speed)
A/T position
Motor relay drive command
ON
—
R
ON
OFF
0 km/h
Positions other than the “P” or
“N” positions
ON
—
“P” or “N” position (See Table
2.)
—
0 < VFF
%
30 km/h
—
ON
30 < VFF < 35 km/h
—
HOLD
35 km/h
%
VFF
—
OFF
Table 2
A/T position
N-4L SW
4WD mode
Throttle position
0 - 0.07/8
0.07/8 - 1/8
1/8 - MAX
N
OFF
LOCK (4H)
ON
ON
ON
Positions other than
the LOCK position
(2WD or AUTO)
See NOTE.
HOLD
ON
ON
—
See NOTE.
HOLD
ON
P
—
—
See NOTE.
HOLD
ON
NOTE:
OFF (after 2.5 seconds have elapsed.)
4. 4WD shift switch, PNP switch, Neutral-4LO switch, vehicle speed sensor and throttle position sensor are
used in conjunction with the transfer motor.
WAIT DETECTION SWITCH
NBTF0067S02
1. The wait detection switch releases the “booming” torque produced in the propeller shaft. After the release
of the “booming” torque, the wait detection switch helps provide the 4WD lock gear (clutch drum) shifts.
A difference may occur between the operation (“4LO” to “4H” shift only) of the 4WD shift switch and actual
drive mode. At this point, the wait detection switch senses an actual drive mode.
2. The wait detection switch operates as follows:
4WD lock gear (clutch drum) locked: ON
4WD lock gear (clutch drum) released: OFF
3. The wait detection switch senses an actual drive mode and the 4WD shift indicator lamp indicates the
vehicle drive mode.
GI
MA
EM
LC
EC
FE
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ALL-MODE 4WD SYSTEM
Description of Electrical Parts
TF-15
2-4WD SHIFT SOLENOID VALVE
NBTF0067S03
The 2-4WD shift solenoid valve operates to apply oil pressure to the wet, multiplate clutch, depending on the
drive mode. The driving force is transmitted to the front wheels through the clutch so the vehicle is set in the
4WD mode. Setting the vehicle in the 2WD mode requires no pressure buildup. In other words, pressure force
applied to the wet, multiplate clutch becomes zero.
LINE PRESSURE SWITCH
NBTF0067S04
1. With the transfer system design, control of the oil pressure provides the transmission of drive torque to
the front wheels. The main pressure to control the oil pressure is referred to as the line pressure.
The line pressure switch determines whether or not adequate line pressure has built up under different
operating conditions.
2. The line pressure switch turns ON when line pressure is produced.
3. The line pressure switch senses line pressure abnormalities and turns the 4WD warning lamp ON.
ALL-MODE 4WD SYSTEM
Description of Electrical Parts (Cont’d)
TF-16
Circuit Diagram for Quick Pinpoint Check
NBTF0009
MTF060A
GI
MA
EM
LC
EC
FE
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ALL-MODE 4WD SYSTEM
Circuit Diagram for Quick Pinpoint Check
TF-17
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