2001 INFINITI QX4 Factory Service Manual

bonnet fuel type fold seats oil tow gas type

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INFINITI QX4 2001 Factory Service Manual Location of Electrical PartsNBTF0008
SMT959D
ALL-MODE 4WD SYSTEM
Location of Electrical Parts
TF-14

Page 2250 of 2395

INFINITI QX4 2001 Factory Service Manual Description of Electrical PartsNBTF0067TRANSFER MOTORNBTF0067S011. The transfer motor drives the sub-oil pump to provide proper lubrication and oil pressure control when the
vehicle is at standstill,

Description of Electrical PartsNBTF0067TRANSFER MOTORNBTF0067S011. 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 ªRº position VFF (Vehicle speed) A/T position Motor relay drive command
ON Ð R ON
OFF0 km/hPositions other than the ªPº or
ªNº positionsON
ÐªPº or ªNº position (See Table
2.)Ð
0 < VFF%30 km/h Ð ON
30 < VFF < 35 km/h Ð HOLD
35 km/h%VFF Ð OFF
Table 2
A/T position N-4L SW 4WD modeThrottle position
0 - 0.07/8 0.07/8 - 1/8 1/8 - MAX
NOFFLOCK (4H) ON ON ON
Positions other than
the LOCK position
(2WD or AUTO)See NOTE. HOLD ON
ON Ð See NOTE. HOLD ON
P Ð Ð 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 SWITCHNBTF0067S021. The wait detection switch releases the ªboomingº torque produced in the propeller shaft. After the release
of the ªboomingº torque, the wait detection switch helps provide the 4WD lock gear (clutch drum) shifts.
A difference may occur between the operation (ª4LOº to ª4Hº 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
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PD
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SU
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ST
RS
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HA
SC
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IDX
ALL-MODE 4WD SYSTEM
Description of Electrical Parts
TF-15

Page 2251 of 2395

INFINITI QX4 2001 Factory Service Manual 2-4WD SHIFT SOLENOID VALVENBTF0067S03The 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 f

Page 2252 of 2395

INFINITI QX4 2001 Factory Service Manual Circuit Diagram for Quick Pinpoint CheckNBTF0009
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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INFINITI QX4 2001 Factory Service Manual Wiring Diagram Ð TF ÐNBTF0010
MTF061A
ALL-MODE 4WD SYSTEM
Wiring Diagram Ð TF Ð
TF-18

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INFINITI QX4 2001 Factory Service Manual MTF062A
GI
MA
EM
LC
EC
FE
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ALL-MODE 4WD SYSTEM
Wiring Diagram Ð TF Ð (Contd)
TF-19

Page 2255 of 2395

INFINITI QX4 2001 Factory Service Manual MTF063A
ALL-MODE 4WD SYSTEM
Wiring Diagram Ð TF Ð (Contd)
TF-20

Page 2256 of 2395

INFINITI QX4 2001 Factory Service Manual MTF064A
GI
MA
EM
LC
EC
FE
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ALL-MODE 4WD SYSTEM
Wiring Diagram Ð TF Ð (Contd)
TF-21

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