transfer motor INFINITI QX56 2004 Factory Owner's Manual

TROUBLE DIAGNOSES FOR SYMPTOMS
TF-95
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Revision: August 20072004 QX56
Component InspectionEDS0018N
4WD SHIFT SWITCH
Check continuity between each terminal.
2-4WD SHIFT SOLENOID VALVE AND TRANSFER FLUID TEMPERATURE SENSOR
Measure resistance between terminals of transfer terminal cord
assembly harness connector F56.
4WD SOLENOID VALVE, CLUTCH PRESSURE SWITCH AND LINE PRESSURE SWITCH
Measure resistance between terminals of transfer terminal cord
assembly harness connector F56.
Terminals Switch position Continuity
1 - 22WD Yes
Except 2WD No
1 - 3, 1 - 4AUTO Yes
Except AUTO No
1 - 4, 1 - 54H Yes
Except 4H No
1 - 4, 1 - 64LO Yes
Except 4LO No
WDIA0090E
Component parts TerminalsResistance
(Approx.)
2-4WD shift solenoid valve 4 - 520°C (68°F):
22.8 - 25.2Ω
Transfer fluid temperature
sensor2 - 320°C (68°F): 2.5 kΩ
80°C (176°F): 0.3 kΩ
LDIA0093E
Component
partsTerminals Remarks
4WD sole-
noid valve6
Ground
terminalApprox. 20°C (68°F): Approx. 3.0 - 3.4Ω
Clutch pres-
sure switch7In room temperature

2-4WD shift solenoid valve “OFF”: No conti-
nuity

2-4WD shift solenoid valve and transfer
motor “ON”: Continuity exists
Line pressure
switch1In room temperature

Turn ignition switch to “OFF” position and
leave vehicle for more than 5 minutes.
(OFF): No continuity

Transfer motor “ON”: Continuity exists
LDIA0094E

TF-96
TROUBLE DIAGNOSES FOR SYMPTOMS
Revision: August 20072004 QX56
TRANSFER DROPPING RESISTOR
Check resistance between terminals.
ATP SWITCH, NEUTRAL-4LO SWITCH AND WAIT DETECTION SWITCH
1. Remove the ATP switch, neutral-4LO switch and the wait detection switch.
2. Measure the resistance between terminals of ATP switch F55, neutral-4LO switch F60 , and wait detection
switch F59.
TRANSFER MOTOR
Apply battery voltage directly to transfer motor harness connector
F57. (Positive: Terminal 14, Negative: Terminal 15)
Transfer motor should operate.
WDIA0091E
Resistance : 11.2 - 12.8 Ω
Switch released state : Continuity should not
exist
Switch pushed state : Continuity should exist
WDIA0082E
LDIA0097E

TROUBLE DIAGNOSES FOR SYMPTOMS
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Revision: August 20072004 QX56
TRANSFER MOTOR RELAY
1. Apply battery voltage and ground directly to transfer motor relay
E154 terminals 1 and 2.
2. Check continuity between transfer motor relay E153 terminals 3
and 5.
TRANSFER SHIFT RELAY (HIGH & LOW)
Check continuity between transfer shift high relay E46 and low relay
E47 terminals 3 and 4.
ACTUATOR AND ACTUATOR POSITION SWITCH
Actuator
Operation and resistance check

Apply battery voltage directly to actuator assembly.
Actuator Position Switch
Continuity check
Condition Continuity (3-5)
Battery voltage is applied Yes
No voltage is applied No
LDIA0098E
Condition Continuity
12V direct current supply
between terminals 1 and 2No
No current supply Yes
LDIA0099E
Operating check Battery positive terminal Battery negative terminal
121 24
224 21
Check Approx. 0.2Ω (When the motor is not operated.)
LDIA0100E
Continuity checkBattery positive
terminalBattery negative
terminalContinuity
121 24 20 - 22
224 21 23 - 22
LDIA0101E

AIR BREATHER HOSE
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Revision: August 20072004 QX56
AIR BREATHER HOSEPFP:31098
Removal and InstallationEDS00319
Refer to the figure for air breather hose removal and installation information.
CAUTION:

Make sure there are no pinched or restricted areas on the air breather hose caused by bending or
winding when installing it.

Install the air breather hose into the air breather (metal connector) and actuator (case connector)
until the hose end reaches the base of the tube.

Install the air breather hose into the breather tube (metal connector) and transfer motor (case con-
nector) until the hose end reaches the end of the curved section.
SDIA2656E

TF-106
TRANSFER MOTOR
Revision: August 20072004 QX56
TRANSFER MOTORPFP:00000
Removal and InstallationEDS0018R
REMOVAL
1. Disconnect transfer motor harness connector.
2. Remove breather pipe from transfer motor.
3. Remove bolts to detach transfer motor.
NOTE:
After removing transfer motor, be sure to replace O-ring with
new one.
INSTALLATIONEDS0018S
1. Apply ATF or petroleum jelly to new O-ring.
NOTE:
Do not reuse O-ring.
2. Align width across flat-notch with oil pump groove, and install
transfer motor.
3. Tighten bolts.
4. Install breather pipe to transfer motor.
5. Connect transfer motor harness connector.
SDIA2133E
Transfer motor bolts : 45 N·m (4.6 kg-m, 33 ft-lb)
SDIA2185E

REMOVAL AND INSTALLATION
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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

OVERHAUL
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Revision: August 20072004 QX56
46. Snap ring 47. Retaining pin 48. L-H fork
49. 2-4 fork 50. Shift fork spring 51. Fork guide
52. Retainer pin 53. Shift rod
1. Dust cover 2. Oil seal 3. Rear case
4. Air breather 5. Seal ring 6. Main oil pump cover
7. Inner gear 8. Outer gear 9. Main oil pump housing
10. D-ring 11. D-ring 12. Clutch piston
13. Thrust needle bearing race 14. Oil strainer 15. O-ring
16. Snap ring 17. Control valve assembly 18. Lip seal (7 pieces)
19. Washer 20. Filler plug 21. Filler stud
22. O-ring 23. Oil filter 24. ATP switch
25 Neutral-4LO switch 26. Oil pressure check plug 27. Harness bracket
28. Stem bleeder 29. Harness bracket 30. Center case
31. Mainshaft rear bearing 32. C-ring 33. Washer holder
34. Snap ring 35. Sub oil pump housing 36. Outer gear
37. Inner gear 38. Sub oil pump cover 39. O-ring
40. Transfer motor 41. Connector bracket
SDIA2091E

CENTER CASE
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Revision: August 20072004 QX56
SUB OIL PUMP
1. Remove bolts to detach transfer motor from center case. Then
remove O-ring from the transfer motor.
2. Remove sub oil pump cover bolts.
3. Thread two bolts (M4 x 0.8) into the holes of sub oil pump cover
as shown, and pull out to remove sub oil pump assembly.
4. Remove sub oil pump cover, outer gear, inner gear, and O-ring
from sub oil pump housing.
SDIA2133E
SDIA2134E
SMT934C
SDIA2135E

CENTER CASE
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Revision: August 20072004 QX56
3. Apply ATF or petroleum jelly to new O-ring and install it to trans-
fer motor.
NOTE:
Do not reuse O-rings.
4. Fit double-flat end of transfer motor shaft into slot of sub-oil
pump assembly. Then tighten bolts.
CAUTION:
Be sure to install connector bracket.
MAIN OIL PUMP
1. Install inner gear and outer gear in the main oil pump housing.
Then, measure the side clearance. Refer to TF-133, "
MAIN OIL
PUMP" .
2. Install main oil pump housing, outer gear and inner gear to cen-
ter case.
3. Apply ATF or petroleum jelly to the new seal ring and install it to
main oil pump cover.
NOTE:
Do not reuse seal ring.
4. Install main oil pump cover to the center case, and install bolts.Transfer motor bolts : 45 N·m (4.6 kg-m, 33 ft-lb)
SDIA2185E
SDIA2174E
Main oil pump bolts : 7.8 N·m (0.8 kg-m, 69 in-lb)
SDIA2188E
SDIA2132E
Main oil pump cover bolts : 7.8 N·m (0.8 kg-m, 69 in-lb)
SDIA2130E