2009 INFINITI QX56 oil

P1826 TRANSFER FLUID TEMPERATURE
DLN-67
< COMPONENT DIAGNOSIS > [ATX14B]
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P1826 TRANSFER FLUID TEMPERATURE
DescriptionINFOID:0000000003772134
Signal voltage from the transfer fluid temperature sens or is abnormally high (Transfer fluid temperature is
abnormally low) while driving.
DTC LogicINFOID:0000000003772135
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1826 displayed?
YES >> Perform diagnosis procedure. Refer to DLN-67, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003772136
1.CHECK TRANSFER FLUID TE MPERATURE SENSOR SIGNAL
With CONSULT-III
1. Start engine.
2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT-III.
3. Read out the value of FLUID TEMP SE.
Without CONSULT-III
1. Start engine.
2. Check voltage between transfer control unit harness connector
terminals and ground.
Are inspection results normal?
YES >> GO TO 4.
NO >> GO TO 2.
2.CHECK HARNESS BETWEEN TRANSF ER CONTROL UNIT AND TRANSFER TERMINAL CORD AS-
DTC CONSULT-III Diagnostic item is detected when... Reference
[P1826] OIL TEMP SEN Signal voltage from transfer fluid temper-
ature sensor is abnormally high (Trans-
fer fluid temperature is abnormally low)
while driving.Refer to
DLN-67
.
Condition Display value
(Approx.)
Transfer fluid temperature approx. 20 - 80 °C (68 - 176 °F) 1.1 - 0.3V
Connector Terminal Condition Data
(Approx.)
E143 28 -
Ground Always 0V
31 -
Ground Ignition switch:
ON Transfer fluid temperature
approx. 20
°C (68 °F) 1.1V
Transfer fluid temperature
approx. 80 °C (176 °F) 0.3V
SDIA2742E
Revision: December 20092009 QX56

TRANSFER CONTROL UNITDLN-99
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CAUTION:
 If CAN COMM CIRCUIT [U1000] or CONTROL UNIT (CAN) [U1010] is displayed with other DTCs, first perform the trouble
diagnosis for CAN communication line.
 If ABS OP SIG [P1830], VDC OP SIG [P1831] or TCS OP SIG [P1832] is displayed, first perform the trouble diagnosis for ABS system.
 If VHCL SPEED SEN·AT [P1807] is displayed, firs t perform the trouble diagnosis for A/T system.
NOTE:
 If SHIFT ACT POSI SW [P1818] or SHIFT ACT CIR [P1819] is disp layed, first erase self-diagnostic results. (SHIFT ACT POSI SW
[P1818] or SHIFT ACT CIR [P1819] may be displayed after installing transfer control unit or transfer assembly.)
 If CL PRES SW [P1827] or LINE PRES SW [P1828] is displayed only while driving in reverse, check the continuity of R position o n
transmission range switch. When there is no malfunction found in the electrical system, check the hydraulic system.
FLASH CODE CHART
[P1826] OIL TEMP SEN Signal voltage from transfer fluid temperature sen-
sor is abnormally high (Transfer fluid temperature is
abnormally low) while driving. Refer to
DLN-67.
[P1827] CLUTCH PRES SW  Improper signal from clutch pressure switch is in-
put due to open or short circuit.
 Malfunction occurs in clutch pressure switch or
hydraulic circuit. Refer to
DLN-70
.
[P1828] LINE PRES SW  Improper signal from line pressure switch is input
due to open or short circuit.
 Malfunction occurs in line pressure switch or hy-
draulic circuit. Refer to
DLN-73
.
[P1829] THROTTLE POSI SEN  Malfunction is detected in accelerator pedal posi-
tion signal that is output from ECM through CAN
communication.
 Signal voltage from accelerator pedal position sensor is abnormally high or low. Refer to
DLN-76
.
[P1830] ABS OP SIG Malfunction is detected in ABS operation signal that
is output from ABS actuator and electric unit (control
unit) through CAN communication. Refer to
DLN-77
.
[P1831] VDC OP SIG Malfunction is detected in VDC operation signal that
is output from ABS actuator and electric unit (control
unit) through CAN communication.
Refer to
DLN-78
.
[P1832] TCS OP SIG Malfunction is detected in TCS operation signal that
is output from ABS actuator and electric unit (control
unit) through CAN communication. Refer to
DLN-79
.
[U1010] CONTROL UNIT (CAN) Detecting error during the initial diagnosis of CAN
controller of transfer control unit. Refer to
DLN-80
DTC CONSULT-III Diagnostic item is detected when... Reference
Flashing pattern Item Diagnostic item is detected when... Reference
2 Vehicle speed signal
(from A/T)  Malfunction is detected in output shaft revolution signal
that is output from TCM through CAN communication.
 Improper signal is input while driving. Refer to
DLN-26
.
3 Clutch pressure sole-
noid signal Proper voltage is not applied to clutch pressure solenoid
valve due to open or short circuit.
Refer to
DLN-53
.
4 2-4WD solenoid signal Proper voltage is not applied to 2-4WD solenoid valve due
to open or short circuit.
Refer to
DLN-57
.
5 Transfer motor Transfer motor does not operate properly due to open or
short circuit in transfer motor or transfer motor relay. Refer to
DLN-61
.
6 Vehicle speed signal
(from ABS)  Malfunction is detected in vehicle speed signal that is out-
put from ABS actuator and elec tric unit (control unit)
through CAN communication.
 Improper signal is input while driving. Refer to
DLN-27
.
7 CAN communication Malfunction has been detected from CAN communication
line. Refer to
LAN-51
.
Revision: December 20092009 QX56

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTINGDLN-119
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NOISE, VIBRATION AND HARSHN ESS (NVH) TROUBLESHOOTING
NVH Troubleshooting ChartINFOID:0000000003772182
Use the chart below to help you find the cause of the symptom. The numbers indicate the order of the inspec-
tion. If necessary, repair or replace these parts.
Reference page
MA-12, "Fluids and Lubricants"DLN-142, "Disassembly and Assembly"DLN-142, "Disassembly and Assembly"DLN-142, "Disassembly and Assembly"DLN-142, "Disassembly and Assembly"
SUSPECTED PARTS
(Possible cause)
TRANSFER FLUID (Level low)
TRANSFER FLUID (Wrong)
TRANSFER FLUID (Level too high)
LIQUID GASKET (Damaged)
O-RING (Worn or damaged)
OIL SEAL (Worn or damaged)
SHIFT FORK (Worn or damaged)
GEAR (Worn or damaged)
BEARING (Worn or damaged)
Symptom Noise 1 2 3 3
Transfer fluid leakage 31222
Hard to shift or will not shift 1 1 2
Revision: December 20092009 QX56

PREPARATIONDLN-123
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PREPARATION
PREPARATION
Special Service ToolINFOID:0000000005874989
The actual shapes of Kent-Moore t ools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name Description
KV381054S0
(J-34286)
Puller  Removing front oil seal
 Removing rear oil seal
 Removing metal bushing
KV38100500
(—)
Drift  Installing front oil seal
a: 80 mm (3.15 in) dia.
b: 60 mm (2.36 in) dia.
ST30720000
(J-25405)
Drift  Installing rear oil seal
 Installing mainshaft front bearing and oil
seal
a: 77 mm (3.03 in) dia.
b: 55.5 mm (2.185 in) dia.
KV40105310
(—)
Drift  Installing dust cover
a: 89 mm (3.50 in) dia.
b: 80.7 mm (3.17 in) dia.
ST22360002
(J-25679-01)
Drift  Installing side oil seal
a: 23 mm (0.91 in) dia.
b: 32 mm (1.26 in) dia.
ST35300000
(—)
Drift  Removing sun gear assembly and planetary
carrier assembly
 Removing carrier bearing
 Installing metal bushing
a: 59 mm (2.32 in) dia.
b: 45 mm (1.77 in) dia.
ZZA0601D
ZZA0811D
ZZA0811D
ZZA1003D
ZZA1091D
NT073
Revision: December 20092009 QX56

DLN-124
< PREPARATION >[ATX14B]
PREPARATION
ST33200000
(J-26082)
Drift Removing mainshaft front bearing
 Installing sun gear assembly and planetary
carrier assembly
 Installing mainshaft front bearing and oil seal
a: 74.5 mm (2.933 in) dia.
b: 62.5 mm (2.461 in) dia.
ST30031000
(—)
Puller  Removing carrier bearing
 Removing front drive shaft front bearing
 Removing front drive shaft rear bearing
a: 90 mm (3.54 in) dia.
b: 50 mm (1.97 in) dia.
ST33710000
(—)
Drift  Removing needle bearing
 Removing metal bushing
a: 24 mm (0.94 in) dia.
b: 89 mm (3.5 in)
c: 30 mm (1.18 in) dia.
ST35325000
(—)
Drift bar  Removing metal bushing
a: 215 mm (8.46 in)
b: 25 mm (0.98 in) dia.
c: M12
× 1.5P
ST33052000
(—)
Adapter  Removing front drive shaft front bearing
 Removing front drive shaft rear bearing
 Installing mainshaft
a: 28 mm (1.10 in) dia.
b: 22 mm (0.87 in) dia.
ST22452000
(J-34335)
Drift  Removing press flange snap ring
 Installing press flange snap ring
a: 45 mm (1.77 in) dia.
b: 36 mm (1.42 in) dia.
c: 400 mm (15.76 in) dia.
ST30911000
(—)
Puller  Removing press flange snap ring
 Installing press flange snap ring
 Installing mainshaft
 Installing carrier bearing
a: 98 mm (3.86 in) dia.
b: 40.5 mm (1.594 in) dia.
Tool number
(Kent-Moore No.)
Tool name
Description
NT661
NT411
ZZA1057D
NT663
NT431
NT117
NT664
Revision: December 20092009 QX56

TRANSFER OIL FILTERDLN-127
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ON-VEHICLE MAINTENANCE
TRANSFER OIL FILTER
Removal and InstallationINFOID:0000000004193522
REMOVAL
1. Remove the oil filter bolts and oil filter. CAUTION:
 Do not damage center case or oil filter.
 Loosen bolts and detach oil filter evenly.
2. Remove the O-rings (1) from the oil filter (2).
3. Remove the oil filter stud from the oil filter.
4. Remove the O-ring from the oil filter stud.
INSTALLATION
1. Apply ATF to the new O-ring, and install it on the oil filter stud. CAUTION:
Do not reuse O-ring.
2. Install the oil filter stud to the oil filter.
SMT875C
WDIA0285E
SDIA3180E
SDIA3180E
Revision: December 20092009 QX56

DLN-128
< ON-VEHICLE MAINTENANCE >[ATX14B]
TRANSFER OIL FILTER
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 DLN-127, "Removal and Installa-
tion".
CAUTION:
 Do not damage oil filter.
 Attach oil filter an d tighten bolts evenly.
5. Check the transfer fluid. Refer to DLN-129, "Inspection"
.
6. Start the engine for one minute. Then stop the engine and recheck the transfer fluid. Refer to DLN-129, "Inspection"
.
WDIA0285E
SDIA2136E
Revision: December 20092009 QX56

FRONT OIL SEALDLN-131
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FRONT OIL SEAL
Removal and InstallationINFOID:0000000005874979
REMOVAL
1. Partially drain the transfer fluid. Refer to DLN-129, "Replacement".
2. Remove the front propeller shaft. Refer to DLN-186, "Removal and Installation"
.
3. Remove the companion flange self-lock nut using suitable tool.
4. Put a matching mark on top of the front drive shaft in line with the mark on the companion flange.
CAUTION:
Use paint to make the matching mark on the front drive
shaft. Do not damage the front drive shaft.
5. Remove the companion flange using suitable tool.
6. Remove the front oil seal from the front case using Tool. CAUTION:
Do not damage front case.
INSTALLATION
SDIA2657E
SDIA2658E
WDIA0193E
Tool number : KV381054S0 (J-34286)
LDIA0144E
Revision: December 20092009 QX56