oil INFINITI QX4 2001 Factory Service Manual

Tool number
(Kent-Moore No.)
Tool nameDescription
KV32101100
(Ð)
Pin punch
NT410
Removing and installing L-H fork, 2-4 fork
a: 6 mm (0.24 in) dia.
ST3306S001
(J22888-D)
Differential side bearing
puller set
1: ST33051001
(Ð)
Puller
2: ST33061000
(J8107-2)
Adapter
NT072
Installing mainshaft rear bearing
Removing sun gear assembly
a: 28.5 mm (1.122 in) dia.
b: 38 mm (1.50 in) dia.
ST30911000
(Ð)
Puller
NT664
Installing mainshaft and planetary carrier assembly
a: 98 mm (3.86 in) dia.
b: 40.5 mm (1.594 in) dia.
KV381054S0
(Ð)
Outer race puller
NT665
Removing rear oil seal
KV40105230
(Ð)
Adapter
NT666
Installing planetary carrier assembly
a: 92 mm (3.62 in) dia.
b: 86 mm (3.39 in) dia.
c: 12 mm (0.47 in)
KV40105310
(Ð)
Support ring
NT661
Installing planetary carrier assembly
a: 89.1 mm (3.508 in) dia.
b: 80.7 mm (3.177 in) dia.
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PREPARATION
Special Service Tools (Cont'd)
TF-7

Tool number
(Kent-Moore No.)
Tool nameDescription
KV40105500
(Ð)
Support
NT667
Installing planetary carrier assembly
a: 69 mm (2.72 in) dia.
b: 52 mm (2.05 in) dia.
c: 120 mm (4.72 in) dia.
KV38100200
(Ð)
Drift
NT673
Installing transfer cover oil seal
a: 65 mm (2.56 in) dia.
b: 49 mm (1.93 in) dia.
KV31103300
(Ð)
Drift
NT668
Removing and installing press flange snap ring
a: 76.3 mm (3.004 in) dia.
b: 130 mm (5.12 in)
KV31103400
(Ð)
Clutch piston attachment
1 Shaft-drift
2 Guide-cylinder
NT669
Installing clutch piston
a: 88.5 mm (3.484 in) dia.
b: 158 mm (6.22 in) dia.
ST33290001
(J25810-A)
Puller
NT414
Removing center case oil seal
Removing rear oil seal
a: 250 mm (9.84 in)
b: 160 mm (6.30 in)
ST33051001
(J22888)
Puller
NT824
Removing companion flange
a: 135 mm (5.31 in)
b: 100 mm (3.94 in)
c: 170 mm (6.69 in)
PREPARATION
Special Service Tools (Cont'd)
TF-8

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

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

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 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 SWITCHNBTF0067S041. 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

SMT772D
TRANSFER CONTROL UNIT INSPECTION TABLENBTF0018S02(Data are reference values.)
Terminal
No.Item Condition Judgement standard
12-4WD shift solenoid
valve
&
4WD shift switch is set to ª2WDº
position.Less than 1V
4WD shift switch is set to any posi-
tion other than ª2WDº.Battery voltage
24WD shift indicator lamp
(2WD)
Lamp lights while system is operating
properly.Less than 1V
&
2WD indicator lamp does not come
on.Battery voltage
3 Ground Ð Ð
4Transfer shift relay
(High)While actuator is operating
(4H,4LO)Battery voltage
Actuator does not operate. Less than 1V
5 4WD warning lampLamp comes ON. (when engine is
stopped.)
(Fail-safe condition appears on
display, engine is stopped, actuator
position detection switch is
inoperative, oil temperature is too
high and/or tires of different size are
installed.)Less than 1V
Except above Battery voltage
6 Ground Ð Ð Ð
7 PNP switch (R position)
&
A/T selector lever is set to ªreverseº
position.Battery voltage
A/T selector lever is set to any posi-
tion other than ªreverseº.Less than 1V
8ÐÐÐÐ
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TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTION
Transfer Control Unit Terminals and Reference Value (Cont'd)
TF-55

Symptom 9. 4WD System Does Not Operate=NBTF0037SYMPTOM: The vehicle cannot be put into 4WD mode.
(Hydraulic system failure)
1 CHECK INPUT SIGNAL
With CONSULT-II
1. Select ªECU INPUT SIGNALSº in Data Monitor.
2. Read out the ON/OFF status of ªCLUTCH PRES SWº.
SMT977D
Without CONSULT-II
Check voltage between transfer control unit harness connector terminal 34 and body ground.
Refer to ªTRANSFER CONTROL UNIT INSPECTION TABLEº, ªTROUBLE DIAGNOSIS Ð GENERAL DESCRIPTIONº,
TF-55.
OK or NG
OK©1. Check transfer fluid level.
2. Disassemble transfer unit and check the following.
ITransfer motor
IMain oil pump assembly
ISub-oil pump assembly
IOil strainer
IControl valve assembly
I2-4WD shift solenoid valve
IOil filter element
ILip seal
IStrainer O-ring
IMain oil pump drive gear
ISeal ring
ID-ring
IClutch piston
IClutch assembly
NG©GO TO 2.
2 CHECK CLUTCH PRESSURE CIRCUIT
Check clutch pressure switch circuit.
Refer to ªDiagnostic Procedureº, ªCLUTCH PRESSURE SWITCHº, TF-80.
OK or NG
OK©GO TO 3.
NG©Check, repair or replace faulty parts.
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TROUBLE DIAGNOSES FOR SYMPTOMS
Symptom 9. 4WD System Does Not Operate
TF-109

SMT844DB
Replacing Oil SealNBTF0068FRONT CASE OIL SEALNBTF0068S011. Drain transfer fluid.
2. Remove exhaust front tube and heat insulator. Refer to
ªRemovalº, TF-119.
3. Remove front propeller shaft. Refer to PD-6, ªRemoval and
Installationº.
4. Remove companion flange lock nut.
IDo not reuse lock nut.
SMT112D
5. Put a matchmark on top of drive pinion thread. The mark
should be in line with the mark on the companion flange.
IAlways mark top of drive pinion screw using paint.
SMT802C
6. Remove companion flange.
SMT803C
7. Remove front case oil seal.
8. Install front case oil seal.
IBefore installing, apply multi-purpose grease to seal lip.
9. Install companion flange.
SMT845DB
10. Tighten nut to the specified torque.
Refer to TF-121.
11. Install front propeller shaft.
ON-VEHICLE SERVICE
Replacing Oil Seal
TF-116

SMT808D
SHIFT SHAFT OIL SEALNBTF0068S021. Remove front propeller shaft. Refer to PD-6, ªRemoval and
Installationº.
2. Remove companion flange. Refer to ªFRONT CASE OIL
SEALº, TF-116.
3. Remove actuator lever from transfer outer shift lever. Then
remove outer shift lever.
SMT491A
4. Remove shift shaft oil seal.
IBe careful not to damage cross shaft.
SMT805C
5. Install shift shaft oil seal.
IBefore installing, apply multi-purpose grease to seal lip.
6. Install transfer control linkage.
7. Install companion flange. Refer to ªFRONT CASE OIL SEALº,
TF-116.
8. Install front propeller shaft.
SMT892C
REAR OIL SEALNBTF0068S031. Remove rear propeller shaft. Refer to PD-6, ªRemoval and
Installationº.
2. Remove rear oil seal.
3. Install rear oil seal.
IBefore installing, apply multi-purpose grease to seal lip.
4. Install rear propeller shaft.
SMT874C
Transfer Motor
REMOVALNBTF00691. Disconnect transfer motor harness connector.
2. Remove breather pipe from transfer motor.
3. Remove bolts to detach transfer motor.
IAfter removing transfer motor, be sure to replace O-ring
with new one.
INSTALLATIONNBTF00701. Apply petroleum jelly or ATF to O-ring.
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ON-VEHICLE SERVICE
Replacing Oil Seal (Cont'd)
TF-117

2. Align width across flat-notch with oil pump groove, and install
transfer motor.
3. Tighten bolts.
: 41 - 48 N´m (4.2 - 4.9 kg-m, 30 - 35 ft-lb)
4. Install breather pipe to transfer motor.
5. Connect transfer motor harness connector.
SMT875C
Transfer Oil Filter
REMOVALNBTF0071IRemove bolts to detach oil filter.
IWhen removing oil filter from transfer, avoid damaging it.
Be sure to loosen bolts evenly.
IWhen removing oil filter, be sure to replace O-ring with
new one.
INSTALLATIONNBTF00721. Apply petroleum jelly or ATF to O-ring.
2. Tighten bolts evenly to install oil filter.
:7-9N´m(0.7 - 0.9 kg-m, 61 - 78 in-lb)
IBe sure not to damage oil filter.
ON-VEHICLE SERVICE
Transfer Motor (Cont'd)
TF-118