2004 INFINITI QX56 Factory Service Manual

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Page 3137 of 3371

INFINITI QX56 2004 Factory Service Manual TF-12
ALL-MODE 4WD SYSTEM
Revision: August 20072004 QX56
ALL-MODE 4WD TRANSFER BASIC CONTROL
HYDRAULIC CONTROL CIRCUITS
OUTLINE
All-mode 4WD transfer is controlled by the transfer control unit and sen

Page 3138 of 3371

INFINITI QX56 2004 Factory Service Manual ALL-MODE 4WD SYSTEM
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CONTROL SYSTEM DIAGRAM
INDICATIONS OF 4WD WARNING LAMP
*: When 4WD warning lamp is ON, all the 4WD shift indicator la

Page 3139 of 3371

INFINITI QX56 2004 Factory Service Manual TF-14
ALL-MODE 4WD SYSTEM
Revision: August 20072004 QX56
Location of Electrical PartsEDS0017Q
WDIA0069E

Page 3140 of 3371

INFINITI QX56 2004 Factory Service Manual ALL-MODE 4WD SYSTEM
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Description of Electrical PartsEDS0017R
TRANSFER MOTOR
1. The transfer motor drives the sub-oil pump to provide prope

ALL-MODE 4WD SYSTEM
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Revision: August 20072004 QX56
Description of Electrical PartsEDS0017R
TRANSFER MOTOR
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.
Ta b l e 1
Ta b l e 2
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
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.
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 when 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.
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)See NOTE. HOLD ON
ON — See NOTE. HOLD ON
P——See NOTE.HOLDON

Page 3141 of 3371

INFINITI QX56 2004 Factory Service Manual TF-16
ALL-MODE 4WD SYSTEM
Revision: August 20072004 QX56
LINE PRESSURE SWITCH
1. With the transfer system design, control of the oil pressure provides the transmission of drive torque to the
front whe

Page 3142 of 3371

INFINITI QX56 2004 Factory Service Manual ALL-MODE 4WD SYSTEM
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Revision: August 20072004 QX56
Circuit Diagram for Quick Pinpoint CheckEDS0017S
WDWA0033E

Page 3143 of 3371

INFINITI QX56 2004 Factory Service Manual TF-18
ALL-MODE 4WD SYSTEM
Revision: August 20072004 QX56
Wiring Diagram — T/F —EDS0017T
WDWA0014E

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INFINITI QX56 2004 Factory Service Manual ALL-MODE 4WD SYSTEM
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Revision: August 20072004 QX56
WDWA0009E

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