torque INFINITI QX56 2004 Factory Service Manual

TF-38
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Revision: August 20072004 QX56
REFERENCE VALUE IN DATA MONITOR MODE
Indicated items
(Screen terms for CONSULT-II, “DATA
MONITOR” mode)Display Conditions
Throttle position sensor
(THRTL POS SEN) 0.0/8 - 8.0/8 Throttle valve fully closed to fully open
Transfer fluid temperature sensor
(FLUID TEMP SE)Approx. 1.5 - 0.5V Transfer fluid temperature approx. 20 - 80°C (68 - 176°F)
ABS operation switch
(ABS OPER SW)OFF ABS is not operating.
ON ABS is operating.
2WD position
(2WD SWITCH)ON 4WD shift switch is in “2WD”.
OFF Except the above condition
Lock position
(LOCK SWITCH)ON 4WD shift switch is in “4H”.
OFF Except the above condition
Neutral-4LO switch
(N POSI SW TF)
AT P s w i tc h
(ATP SWITCH)
Wait detection switch
(WAIT DETCT SW)4WD shift switch position2WD,
AUTO, 4H(N) 4LO
AT P s w i t c h O F F O N O F F
Neutral-4LO switch/Wait detec-
tion switch See Note.OFF ON
Note: When shifting into or out of “4LO” the switches turn ON when “Wait” function is oper-
ating and they turn OFF when “Wait” function is canceled.
Tran s fe r mo to r re lay
(MOTOR RELAY)
Transfer motor relay monitor
(MOTOR RELAY MON)Throttle valve4WD
shift
switchA/T selector
leverMotor relay/
Motor relay
monRemarks
Fully closed2WD — OFF —
AUTO,
4LOP, N O F F
ON for approx. 2 sec. after
shifting to “P” and “N”
Others ON
4HPOFF
ON for approx. 2 sec. after
shifting to “P”
Others ON
Line pressure switch
(LINE PRES SW)OFFThe vehicle has been left at room temperature for 5 min-
utes and more with ignition switch in “OFF” position.
ONIgnition switch in “ON”, and 4WD shift switch in “AUTO” or
“4H” and A/T selector lever in “D”.
Clutch pressure switch
(CL PRES SW)OFFIgnition switch in “ON”, and 4WD shift switch in “2WD”.
(“Wait” function is not operating.)
ONIgnition switch in “ON”, and 4WD shift switch in “AUTO” or
“4H” and A/T selector lever in “D”. (“Wait” function is not
operating.)
Vehicle speed
(VHCL/S COMP)0 km/h (0 MPH) — —
Control torque
(COMP CL TORQ)0 kg-m
4WD shift switch
(“Wait” function is not oper-
ating.)In “2WD” position
39 - 1,353 N·m
(4 - 138 kg-m, 29 - 998 ft.-lb.)In “AUTO” position
1,353 N·m
(138 kg-m, 998 ft.-lb.)In “4H” or “4LO” position
4WD solenoid
(DUTY SOLENOID)4% In “2WD” position
96 - 4% In “AUTO” position
4% In “4H” or “4LO” position

TF-98
TRANSFER CONTROL UNIT
Revision: August 20072004 QX56
TRANSFER CONTROL UNITPFP:33084
Removal and InstallationEDS00314
REMOVAL
1. Set transfer state as 2WD when 4WD shift switch is at 2WD, or as AUTO when 4WD shift switch is at
AUTO.
CAUTION:
When removing transfer control unit, transfer state must be at 2WD or AUTO.
2. Turn the ignition switch OFF and disconnect negative battery terminal.
3. Remove the glove box assembly. Refer to IP-14, "
Instrument Lower Cover RH and Glove Box" .
4. Disconnect the two transfer control unit connectors.
5. Remove the transfer control unit bolts.
6. Remove the transfer control unit.
INSTALLATION
Installation is in the reverse order of removal.

When installing the transfer control unit, tighten bolts to the specified torque.
CAUTION:

Do not connect harness connector to transfer control unit when 4WD shift switch is at 4LO.

After the installation, check perform self-diagnosis. Refer to TF-28, "SELF-DIAGNOSTIC PROCEDURE"
. If NG, adjust position between transfer assembly and transfer control unit.
BDIA0014E
Transfer control unit bolts : 5.1 N·m (0.52 kg-m, 45 in-lb)

TF-100
FRONT OIL SEAL
Revision: August 20072004 QX56
INSTALLATION
1. Install the oil seal until it is flush with the end face of the front
case, using Tool.
CAUTION:

Do not reuse oil seal.

Apply petroleum jelly to oil seal.
2. Align the matching mark of the front drive shaft with the match-
ing mark of the companion flange, then install the companion
flange.
3. Install the self-lock nut. Tighten to the specified torque, using
Tool. Refer to TF-110, "
Transfer Components" .
CAUTION:
Do not reuse self-lock nut.
4. Install the front propeller shaft. Refer to PR-4, "
Removal and
Installation" .
5. Refill the transfer with fluid and check fluid level. Refer to MA-
24, "Changing Transfer Fluid" .
6. Check the transfer for fluid leakage. Refer to MA-24, "
Checking
Transfer Fluid" . Tool number : KV38100500 ( — )
SDIA2662E
SDIA2658E
Tool number : KV40104000 ( — )
LDIA0147E

TF-108
TRANSFER OIL FILTER
Revision: August 20072004 QX56
3. Apply ATF to the two new O-rings (1), and install them on the oil
filter (2).
CAUTION:
Do not reuse O-rings.
4. Install the oil filter to the transfer assembly. Tighten the bolts to
the specified torque. Refer to TF-110, "
Transfer Components" .
CAUTION:

Do not damage oil filter.

Attach oil filter and tighten bolts evenly.
5. Check the transfer fluid. Refer to MA-24, "
Checking Transfer
Fluid" .
6. Start the engine for one minute. Then stop the engine and
recheck the transfer fluid.
WDIA0285E
SDIA2136E

REMOVAL AND INSTALLATION
TF-109
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: August 20072004 QX56
REMOVAL AND INSTALLATIONPFP:00000
RemovalEDS0018V
1. Remove A/T undercover using power tools.
2. Remove center exhaust tube and muffler. Refer to EX-3, "
EXHAUST SYSTEM" .
3. Remove front and rear propeller shafts. Refer to PR-5, "
REMOVAL" (front) and PR-9, "REMOVAL"
(rear).
CAUTION:
Be careful not to damage spline, sleeve yoke and rear oil seal when removing the rear propeller
shaft
NOTE:
Insert a plug into rear oil seal after removing rear propeller shaft.
4. Remove A/T mount bolts. Refer to AT-255, "
TRANSMISSION ASSEMBLY" .
5. Position two suitable jacks under A/T and transfer assembly.
6. Remove crossmember. Refer to TF-109, "
REMOVAL AND INSTALLATION" .
WAR NIN G:
Support A/T and transfer assembly using two suitable jacks while removing crossmember.
7. Disconnect the ATP switch, neutral 4LO switch, wait detection switch, transfer motor and transfer control
device electrical connectors.
8. Remove breather hoses from the actuator, transfer rear case and transfer motor.
9. Remove the shift actuator from the extension housing.
10. Remove transfer to A/T bolts.
WAR NIN G:
Support transfer assembly with suitable jack while removing it.
11. Remove transfer assembly.
InstallationEDS0018W
1. Installation is in the reverse order of removal.
Bolt length : 45 mm (1.77 in)
Transfer bolt torque : 36 N·m (3.7 kg-m, 26 ft-lb)
SMT872C

FRONT CASE
TF-137
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: August 20072004 QX56
6. Install oil new seal in front case, using Tool.
NOTE:

Before installing, apply ATF or petroleum jelly to seal lip.

Do not reuse oil seal.
7. Install the shift lever to the shift cross, and lock pin and tighten to
specified torque. Refer to TF-110, "
Transfer Components" .
8. Install the carrier bearing to the sun gear assembly, using Tool.
9. Install new snap ring to sun gear assembly, using suitable tool.
NOTE:
Do not reuse snap ring.
10. Apply ATF to the circumference of the new metal busing prior to
installing it to the sun gear assembly, using Tool.
NOTE:
Do not reuse old metal bushing.
11. Install the needle bearing to the sun gear assembly, using Tool.
NOTE:

Before installing, apply ATF to needle bearing.

Do not reuse old needle bearing.Tool number : ST22360002 (J25679-01)
SDIA2182E
To o l n u m b e r
A : ST30911000 ( — )
B : KV31103300 ( — )
SDIA2179E
SDIA2148E
Dimension A : 7.7 - 8.3 mm (0.303 - 0.327 in)
Tool number : ST35300000 ( — )
SDIA2187E
Dimension B : 62.5 - 63.1 mm (2.461 - 2.484 in)
Tool number : ST33220000 ( — )
SDIA2478E

FRONT CASE
TF-139
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: August 20072004 QX56
17. Install shift rod assembly to front case assembly. Refer to TF-139, "SHIFT ROD ASSEMBLY" .
SHIFT ROD ASSEMBLY
1. Install fork guide, shift fork spring, 2-4 fork, and L-H fork to shift
rod, and secure them with new retaining pins.
NOTE:
Do not reuse retaining pins.
2. Install 2-4 sleeve and L-H sleeve to each fork.
3. While aligning L-H sleeve with planetary carrier, install shift rod
assembly to front case.
4. Remove all the liquid gasket on check plug and front case, and
install check ball and check spring to front case. Apply specified
sealant or equivalent, to check plug. Install it to front case, and
tighten to specified torque. Refer to GI-45, "
Recommended
Chemical Products and Sealants" .
5. Remove all the liquid gasket on the switch fitting and inner side
of front case, and with wait detection switch threaded one pitch
into the hole. Apply specified sealant or equivalent, to the
thread. Install it, and tighten to specified torque. Refer to GI-45,
"Recommended Chemical Products and Sealants" .
NOTE:
Wait detection switch harness connector is black.
6. Install center case assembly to front case assembly. Refer to TF-149, "
Final Assembly" .
7. Install rear case assembly to center case. Refer to TF-149, "
Final Assembly" .
SDIA2142E
SMT992C
SDIA2140E
Front case check plug : 22 N·m (2.2 kg-m, 16 ft-lb)
Wait detection switch : 28 N·m (2.9 kg-m, 21 ft-lb)
SDIA2139E

CENTER CASE
TF-143
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: August 20072004 QX56
6. With lower body down, tighten two bolts in the position shown.
7. Apply ATF or petroleum jelly to new O-ring, and install it to 2-
4WD shift solenoid valve, line pressure switch and 4WD sole-
noid valve. Install them to control valve assembly.
NOTE:
Do not reuse O-rings.
8. Apply ATF or petroleum jelly to lip seals, and install them to cen-
ter case.
CAUTION:
There are 2 kinds of lip seals (lip seal of large inner diame-
ter: 5 pieces, lip seal of small inner diameter: 2 pieces).
Confirm their position for installation.
NOTE:
Do not reuse lip seals.
9. Install the other 13 bolts and tighten them to specified torque.
10. Install control valve assembly to center case, and tighten bolts.
11. Install connector assembly into center case installation hole, and
secure terminal body with snap ring.
SDIA2124E
SDIA2123E
Control valve case bolts : 7.9 N·m (0.81 mm, 70 in-lb)
SDIA2100E
Control valve bolts : 7.9 N·m (0.81 kg-m, 70 in-lb)
SDIA2121E
SDIA2122E

TF-150
ASSEMBLY
Revision: August 20072004 QX56
4. Install center case assembly to front case assembly.
CAUTION:
Pay careful attention so that mainshaft end is not damaged.
5. Tap center case lightly press-fit front drive shaft bearing into
front case, using suitable tool.
6. Tighten front case bolts to specified torque.
NOTE:
Be sure to install air breather hose clamp, connector bracket
and harness clip.
7. Remove all the gasket fluid from switch mounting area and
inside center case. With ATP switch and neutral-4LO switch
threaded in 1 to 2 pitches, apply specified sealant or equivalent
to the thread of the switches and tighten to specified torque.
Refer to GI-45, "
Recommended Chemical Products and Seal-
ants" .
8. Apply ATF or petroleum jelly to stem bleeder and install to center
case.
9. Install main oil pump assembly to the center case assembly and tighten bolts. Refer to TF-110, "
Transfer
Components" .
SDIA2138E
Front case bolts : 45 N·m (4.6 kg-m, 33 ft-lb)
SDIA2100E
ATP and Neutral- 4LO
switches: 28 N·m (2.9 kg-m, 21 ft-lb)
SDIA2096E
SDIA2097E

TF-152
ASSEMBLY
Revision: August 20072004 QX56
15. Install air breather into rear case.
16. Apply specified Anaerobic Liquid Gasket or equivalent to entire
rear case mounting surface of center case as shown. Refer to
GI-45, "
Recommended Chemical Products and Sealants" .
CAUTION:
Be careful not to allow Liquid Gasket to the stem bleeder
hole.
NOTE:
Remove all foreign materials such as water, oil, and grease from
center case and rear case mating surfaces.
17. Install rear case to center case, and tighten bolts to specified
torque.
18. Installation of the remaining components is in the reverse order of removal.
SDIA2206E
Center case bolts : 45 N·m 4.6 kg-m, 33 ft-lb)
SDIA2100E