2005 INFINITI QX4 Factory Service Manual

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Page 3153 of 3419

INFINITI QX4 2005 Factory Service Manual TF-10
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
Revision: October 20052005 QX56
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTINGPFP:00003
NVH Troubleshooting ChartEDS0 02 I1
Use the cha

Page 3154 of 3419

INFINITI QX4 2005 Factory Service Manual TRANSFER FLUID
TF-11
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B
TF
Revision: October 20052005 QX56
TRANSFER FLUIDPFP:31001
ReplacementEDS002I2
DRAINING
1. Stop the engine.
2. Remove the drain plug and gasket to drain the

Page 3155 of 3419

INFINITI QX4 2005 Factory Service Manual TF-12
ALL-MODE 4WD SYSTEM
Revision: October 20052005 QX56
ALL-MODE 4WD SYSTEMPFP:00000
Cross-section ViewEDS002H8
1. Center case 2. Front case 3. Internal gear
4. Planetary carrier assembly 5. Sun gea

Page 3156 of 3419

INFINITI QX4 2005 Factory Service Manual ALL-MODE 4WD SYSTEM
TF-13
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TF
Revision: October 20052005 QX56
Power TransferEDS0 02 H9
POWER TRANSFER DIAGRAM
1. Center case 2. Chain 3. Multiple disc clutch
4. Rear case 5. Mai

Page 3157 of 3419

INFINITI QX4 2005 Factory Service Manual TF-14
ALL-MODE 4WD SYSTEM
Revision: October 20052005 QX56
POWER TRANSFER FLOW
WDIA0201E

Page 3158 of 3419

INFINITI QX4 2005 Factory Service Manual ALL-MODE 4WD SYSTEM
TF-15
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Revision: October 20052005 QX56
System DescriptionEDS002HA
CONTROL SYSTEM
WDIA0162E

Page 3159 of 3419

INFINITI QX4 2005 Factory Service Manual TF-16
ALL-MODE 4WD SYSTEM
Revision: October 20052005 QX56
ALL-MODE 4WD Transfer Basic Control
Hydraulic Control Circuits
TRANSFER MOTOR
The transfer motor drives the sub-oil pump to provide proper lu

Page 3160 of 3419

INFINITI QX4 2005 Factory Service Manual ALL-MODE 4WD SYSTEM
TF-17
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Revision: October 20052005 QX56
Ta b l e 1
Ta b l e 2
*: After 2.5 seconds have elapsed.
4WD shift switch, PNP switch, Neutral-4LO switch, vehicl

ALL-MODE 4WD SYSTEM
TF-17
C
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F
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H
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K
L
MA
B
TF
Revision: October 20052005 QX56
Ta b l e 1
Ta b l e 2
*: After 2.5 seconds have elapsed.
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
The wait detection switch operates when there is “circulating” torque produced in the propeller shaft
(L→H) or when there is a phase difference between 2-4 sleeve and clutch drum (H→L). After the release
of the “circulating” torque, the wait detection switch helps provide the 4WD lock gear (clutch drum) shifts.
A difference may occur between the operation of the 4WD shift switch and actual drive mode. At this
point, the wait detection switch senses an actual drive mode.
The wait detection switch operates as follows.
–4WD lock gear (clutch drum) locked: ON
–4WD lock gear (clutch drum) released: OFF
The wait detection switch senses an actual drive mode and the 4WD shift indicator lamp indicates the
vehicle drive mode.
NEUTRAL-4LO SWITCH
The neutral-4LO switch detects that transfer gear is in neutral or 4LO (or shifting from neutral to 4LO) condi-
tion by L-H shift fork position.
ATP SWITCH
ATP switch detects if transfer gear is in a neutral condition by L-H shift fork position.
NOTE:
Transfer gear may be in a neutral condition in 4H-4LO.
2-4WD SHIFT SOLENOID VALVE
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.
CLUTCH PRESSURE SOLENOID VALVE
The clutch pressure solenoid valve distributes torque (front and rear) in AUTO mode.
PNP switch “R” position VFF (Vehicle speed) A/T position Motor relay drive command
ON — R ON
OFF0Positions other than the “P” or
“N” positionsON
—“P” or “N” position (See Table
2.)—
0 < VFF ≤ 50 km/h (31 MPH) — ON
50 km/h (31 MPH) < VFF < 55
km/h (34 MPH)—HOLD
55 km/h (34 MPH) ≤ VFF — OFF
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)OFF* HOLD ON
ON — OFF* HOLD ON
P — — OFF* HOLD ON

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