IDX INFINITI QX4 2001 Factory Service Manual

Tool number
(Kent-Moore No.)
Tool nameDescription
(J35864)
Drift
NT671
Installing oil seal
Commercial Service ToolsNBTF0005
Tool name Description
Puller
NT077
Removing companion flange, clutch gear and
mainshaft gear bearing
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PREPARATION
Special Service Tools (Cont'd)
TF-9

Control SystemNBTF0007
SMT961D
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ALL-MODE 4WD SYSTEM
Control System
TF-11

CONTROL SYSTEM DIAGRAMNBTF0007S04
SMT763D
INDICATIONS OF 4WD WARNING LAMPNBTF0007S05
Condition Content 4WD warning lamp
During self-diagnosis Indicates the malfunction position by number of flickers. Flickers at malfunction mode.
Lamp check*Checks the lamp by turning ON during engine starting. After
engine starts, it turns OFF if there are no malfunctions.ON
Malfunction in 4WD system*Turns ON to indicate malfunction. When ignition switch is
turned to ªOFFº or the malfunction is corrected, it turns OFF.ON
When vehicle is driven with different
diameters of front and rear tiresFlickers once every 2 seconds.
Turns OFF when ignition switch is ªOFFº.Flickers once every 2 sec-
onds.
High fluid temperature in transfer
unitWhen fluid temperature is high or fluid temperature sensor
circuit is shorted, it flickers twice every second.
It turns OFF when fluid temperature becomes normal.Flickers twice a second.
Other than above (System is nor-
mal.)Lamp is OFF. OFF
*: When 4WD warning lamp is ON, all the 4WD shift indicator lamps turn OFF.
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ALL-MODE 4WD SYSTEM
Control System (Cont'd)
TF-13

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
ЪPº 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.
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ALL-MODE 4WD SYSTEM
Description of Electrical Parts
TF-15

Circuit Diagram for Quick Pinpoint CheckNBTF0009
MTF060A
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ALL-MODE 4WD SYSTEM
Circuit Diagram for Quick Pinpoint Check
TF-17

MTF062A
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ALL-MODE 4WD SYSTEM
Wiring Diagram Ð TF Ð (Cont'd)
TF-19

MTF064A
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ALL-MODE 4WD SYSTEM
Wiring Diagram Ð TF Ð (Cont'd)
TF-21

MTF066A
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ALL-MODE 4WD SYSTEM
Wiring Diagram Ð TF Ð (Cont'd)
TF-23

MTF076A
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ALL-MODE 4WD SYSTEM
Wiring Diagram Ð TF Ð (Cont'd)
TF-25

Trouble Diagnosis without CONSULT-IINBTF0011DESCRIPTIONNBTF0011S01If the engine starts when there is something wrong with the all-
mode 4WD system, the 4WD warning lamp turns ON or flickers in
the combination meter. When the system functions properly, the
warning lamp turns ON when the ignition switch is turned to ªONº,
and it turns OFF after engine starts.
To locate the cause of a problem, start the self-diagnosis function.
The 4WD warning lamp in the combination meter will indicate the
problem area by flickering according to the self-diagnostic results.
As for the details of the 4WD warning lamp flickering patterns, refer
to TF-29.GI
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Trouble Diagnosis without CONSULT-II
TF-27