BATTERY INFINITI QX56 2011 Factory Service Manual

PRECAUTIONSDLN-7
< PRECAUTION > [TRANSFER: ATX90A]
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5. When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button ignition switch is turned to LOCK position.)
6. Perform self-diagnosis check of a ll control units using CONSULT-III.
Service Notice or Precautions for TransferINFOID:0000000006222211
CAUTION:
 Use Genuine NISSAN Transfer Fluid. Refer to MA-10, "
Fluids and Lubricants".
 Never reuse transfer fluid, once it has been drained.
 Check the fluid level or repl ace the fluid only with the vehicle parked on level ground.
 During removal or installati on, keep inside of transfer clear of dust or dirt.
 Replace all tires at the same time. Always use tir es of the proper size and the same brand and pat-
tern. Fitting improper size and unusually worn tires applies excessive force to vehicle mechanism
and can cause longitudinal vibration.
 Disassembly should be done in a clean work area, it is preferable to work in dustproof area.
 Before proceeding with disassembly, thoroughly clean the transfer. It is important to prevent the
internal parts from becoming contamin ated by dirt or other foreign matter.
 All parts should be carefully cl eaned with a general purpose, non-flammable solvent before inspec-
tion or reassembly.
 Check for the correct installation status prior to removal or disassembly. If matching marks are
required, be certain they do not interfere wit h the function of the parts when applied.
 Check appearance of the disassembled parts for damage, deformation, and unusual wear. Replace
them with a new ones if necessary.
 Gaskets, seals and O-rings should be replaced any time the transfer is disassembled.
 In principle, tighten bolts or nu ts gradually in several steps workin g diagonally from inside to out-
side. If tightening sequence is specified, use it.
 Observe the specified torque when assembling.
 Clean and flush the parts su fficiently and blow-dry them.
 Be careful not to damage sliding surfaces and mating surfaces.
 Clean inner parts with lint-free cloth or towels . Do not use cotton work gloves and rags to prevent
adhering fibers.
Revision: 2010 May2011 QX56

TRANSFER CONTROL UNITDLN-25
< ECU DIAGNOSIS INFORMATION > [TRANSFER: ATX90A]
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HI-LO POSI SEN 3 4WD mode: AUTO or 4H ON
4WD mode: Shifting OFF
4WD mode: 4L OFF
HI-LO POSI SEN 1 4WD mode: AUTO or 4H ON
4WD mode: Shifting ON
4WD mode: 4L OFF
LOCK POSI SEN When lock sleeve is opening OPEN
When lock sleeve locking LOCK
When transfer lock position sensor
signal circuit is short. (Battery
short) BAT
When transfer lock position sensor is unlearned. UNLEAN
When the temperature of transfer lock position sensor is high. HI TMP
When transfer lock position sensor is malfunctioning. ERROR
When transfer lock position sensor signal circuit is short. (Ground
short) GND
AT P I N D ATP lamp: ON ON
AT P l a m p : O F F O F F
4WD FAIL LAMP 4WD warning lamp: ON ON
4WD warning lamp: OFF OFF
4WD MODE IND 4WD shift switch: AUTO AUTO
4WD shift switch: 4H LOCK
4WD shift switch: 4L 4L
MOTOR DRIVE B When transfer motor is driving in reversal. (100% duty controlled) HI
When transfer motor is driving or stopping. LO
When transfer motor is driving in reversal. (PWM output) PWM
MOTOR DRIVE A When transfer motor is driving. (100% duty controlled) HI
When transfer motor is driving in reversal or stopping. LO
When transfer motor is driving. (PWM output) PWM
FLUID TEMP SE The temperature of transfer fluid is 20 – 80 °C. Approx. 1.1 – 0.3 V
MOTOR TEMP The temperature of transfer motor is 20 – 80 °C. Approx. 1.1 – 0.3 V
C/U POWER SUP Always Battery voltage
MOTOR POWER SUP Always Battery voltage
ROTARY POSI SEN 4WD mode: AUTO
A/T shift selector: DDepress the accelerator pedal several
times.
Value is changing
THRTL POS SEN When depressing accelerator pedal
(Value rises gradually in response to throttle position) 0 – 100 %
AT R SPEED Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle driving (4WD mode: AUTO)
CAUTION:
Check air pressure of tire under standard condition. Approx. equal to the indication
on speedometer (inside of ±10
%)
T/M GEAR A/T shift selector: D
Vehicle driving 1
2
3
4
5
6
7
Monitor item Condition Value/Status
Revision: 2010 May2011 QX56

TRANSFER CONTROL UNITDLN-27
< ECU DIAGNOSIS INFORMATION > [TRANSFER: ATX90A]
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7
(Y) Ground
Transfer fluid tempera-
ture sensor power supply Input Engine running 0 – 5V
9
(G) Ground Transfer internal speed
sensor (GND) —Always 0 V
10
(Y/G) Ground Transfer internal speed
sensor (IMP)
Input IGN ON Transfer motor driving
11
(V) Ground 4WD shift SW (4Lo) Input IGN ON 4WD shift switch: 4L Battery voltage
4WD shift switch: Except
4L
0 V
12
(L) —CAN-H Input/
Output ——
13
(P) —CAN-L
Input/
Output ——
14
(W/R) Ground 4WD shift SW (AUTO) Input IGN ON 4WD shift switch: AUTO Battery voltage
4WD shift switch: Except
AUTO
0 V
15
(P/B) Ground Transfer rotary position
sensor (PWM)
Input IGN ON
16
(LG) Ground
Transfer rotary position
sensor (GND) —Always 0 V
17
(W/L) Ground Transfer lock position
sensor power supply InputIGN ON 5V
10 seconds or more later after ignition
switch turned OFF 0V
18
(BR/Y) Ground Transfer rotary position
sensor power supply
InputIGN ON 5V
10 seconds or more later after ignition
switch turned OFF 0V
20
(GR) Ground
Transfer control unit pow-
er supply Input Always Battery voltage
25
(P/L) Ground Hi-Lo position sensor 3 Input/
Output Engine
running
(Never
drive the
vehicle.) 4WD mode: AUTO or 4H 0 V
4WD mode: Shifting 5 V
4WD mode: 4L 5 V
28
(W) Ground
Transfer motor tempera-
ture sensor power supply InputIGN ON 0 – 5V
IGN OFF 0V
Te r m i n a l N o .
(Wire color) Description
Condition Value (Approx.)
+ - Signal name Input/
Output
JPDIE0267GB
JPDIE0268GB
Revision: 2010 May2011 QX56

DLN-28
< ECU DIAGNOSIS INFORMATION >[TRANSFER: ATX90A]
TRANSFER CONTROL UNIT
CAUTION:
When using circuit tester to measure voltage for in
spection, be sure not to extend forcibly any con-
nector terminals.
Fail-SafeINFOID:0000000006222228
 If any malfunction occurs in 4WD electrical system, and control unit detects the malfunction, 4WD warning
lamp on combination meter turns ON to indicate system malfunction.
 When 4WD warning lamp is ON, vehicle changes to rear-wheel drive or shifts to 4-wheel drive (front-wheels
still have some driving torque).
29
(LG/R) Ground Hi-Lo position sensor 2
Input/
Output Engine
running
(Never
drive the
vehicle.)
Always 0 V
30
(R/B) Ground Transfer lock position
sensor (GND) —Always 0 V
31
(L/O) Ground Transfer internal speed
sensor (DIR)
Input IGN ONWhen changing the trans-
fer motor rota
tion direc-
tion.
32
(BR/R) Ground IGN SW Input IGN ON Battery voltage
IGN OFF 0V
35
(R) Ground 4WD shift SW (4H) Input IGN ON 4WD shift switch: 4H Battery voltage
4WD shift switch: Except
4H
0 V
36
(L/R) Ground Transfer fluid tempera-
ture sensor (GND)
—Always 0 V
38
(G/O) Ground
Transfer lock position
sensor signal Input IGN ON
39
(R/W) Ground Transfer internal speed
sensor power supply
InputIGN ON 8 V
IGN OFF 0V
41
(W/R) Ground Transfer control actuator
power supply Input Always Battery voltage
43
(G/R) Ground Motor drive B Input/
Output Transfer motor driving 0V - Battery voltage
44
(B) Ground GND — Always 0 V
45
(G/Y) Ground Motor drive A Input/
Output Transfer motor driving 0V - Battery voltage
46
(B) Ground Transfer control actuator
(GND)
—Always 0 V
Te r m i n a l N o .
(Wire color) Description
Condition Value (Approx.)
+ - Signal name Input/
Output
JPDIE0269GB
JPDIE0268GB
Revision: 2010 May2011 QX56

TRANSFER CONTROL UNITDLN-29
< ECU DIAGNOSIS INFORMATION > [TRANSFER: ATX90A]
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DTC Inspection Priority ChartINFOID:0000000006222229
If some DTCs are displayed at the same time, per form inspections one by one based on the following priority
chart.
DTC IndexINFOID:0000000006222230
Priority Detected items (DTC)
1  U1000 CAN COMM CIRCUIT
 U1010 CONTROL UNIT (CAN)
2  P1802 CONTROL UNIT 1
 P1803 CONTROL UNIT 2
 P1804 CONTROL UNIT 3
 P1809 CONTROL UNIT 4
 P180C SEN POWER SUPPLY (5V)
 P180E SEN POWER SUPPLY (8V)
 P1811 BATTERY VOLTAGE
 P181B INCOMP SELFSHUT
 P181C MOTOR POWER SUPPLY
 P181F INCOMP CALIBRATION
3  P1807 VECL SPEED SEN-AT
 P1808 VECL SPEED SEN-ABS
 P1816 PNP SW/CIRC
 P181E ST ANGLE SEN SIG
 P1820 ENGINE SPEED SIG
 P1829 THROTTLE POSI SEN
 P1830 ABS OP SIG
 P1831 VDC OP SIG
 P1832 TCS OP SIG
4  P180D ROTARY POSITION SEN
 P1813 4WD MODE SW
 P181A MOTOR TEMP SEN
 P1826 OIL TEMP SEN
 P182A HI-LO POSITION SEN
 P182B LOCK POSITION SEN
5  P180F MOTOR SYSTEM
 P1817 SHIFT ACTUATOR
DTC Display Items Reference
P1802 CONTROL UNIT 1 DLN-51, "
DTC Logic"
P1803 CONTROL UNIT 2DLN-51, "DTC Logic"
P1804 CONTROL UNIT 3DLN-51, "DTC Logic"
P1807 VHCL SPEED SEN-ATDLN-52, "DTC Logic"
P1808 VHCL SPEED SEN-ABSDLN-53, "DTC Logic"
P1809 CONTROL UNIT 4DLN-51, "DTC Logic"
P180C SEN POWER SUPPLY (5V) DLN-54, "DTC Logic"
P180D ROTARY POSITION SENDLN-57, "DTC Logic"
P180E SEN POWER SUPPLY (8V)DLN-59, "DTC Logic"
P180F MOTOR SYSTEMDLN-61, "DTC Logic"
P1811 BATTERY VOLTAGEDLN-64, "DTC Logic"
P1813 4WD MODE SW DLN-67, "DTC Logic"
P1816 PNP SW/CIRCDLN-69, "DTC Logic"
P1817 SHIFT ACTUATORDLN-70, "DTC Logic"
P181A MOTOR TEMP SEN DLN-72, "DTC Logic"
P181B IMCOMP SELFSHUTDLN-74, "DTC Logic"
Revision: 2010 May2011 QX56

DLN-64
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P1811 POWER SUPPLY CIRCUIT
FOR TRANSFER CONTROL UNIT
P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT
DescriptionINFOID:0000000006222260
Supplies power to transfer control unit.
DTC LogicINFOID:0000000006222261
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“P1811” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-64, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222262
1.CHECK TRANSFER CONTROL UNIT POWER SUPPLY (1)
1. Turn the ignition switch OFF.
2. Disconnect transfer control unit harness connector.
3. Check the voltage between transfer control unit harness connector and ground.
4. Turn the ignition switch ON. CAUTION:
Never start the engine.
5. Check the voltage between transfer control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK TRANSFER CONTROL UNIT POWER SUPPLY (2)
1. Turn the ignition switch OFF.
2. Check the 10A fuse (#34).
3. Check the harness for open or short between transfe r control unit harness connector No.20 terminal and
10A (#34).
Is the inspection result normal?
YES >> Perform the trouble diagnosis for power supply circuit. Refer to PG-11, "Wiring Diagram - BAT-
TERY POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
DTC Display item Malfunction detected condition Possible cause
P1811 BATTERY VOLTAGE When transfer control unit power supply
is lower or higher than normalMalfunction of transfer control unit pow-
er supply circuit (open or short)
Transfer control unit
—Voltage
Connector Terminal
E59 20 Ground Battery voltage
Transfer control unit —Voltage
Connector Terminal
E59 20 Ground Battery voltage
Revision: 2010 May2011 QX56

P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT
DLN-65
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
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3.CHECK TRANSFER CONTROL UNIT POWER SUPPLY (3)
1. Turn the ignition switch OFF.
2. Check the voltage between transfer control unit harness connector and ground.
3. Turn the ignition switch ON. CAUTION:
Never start the engine.
4. Check the voltage between transfer control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.CHECK TRANSFER CONTROL UNIT POWER SUPPLY (4)
1. Turn the ignition switch OFF.
2. Check the 10A fuse (#56).
3. Disconnect IPDM E/R harness connector.
4. Check the continuity between transfer control unit harness connector and IPDM E/R harness connector.
5. Check the continuity between transfer control unit harness connector and the ground.
Is the inspection result normal?
YES >> Perform the trouble diagnosis for ignition power supply circuit. Refer to PG-89, "Wiring Diagram -
IGNITION POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
5.CHECK TRANSFER CONTROL UNIT GROUND
1. Turn the ignition switch OFF.
2. Check the continuity between transfer control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace error-detected parts.
6.CHECK TERMINALS AND HARNESS CONNECTORS
Transfer control unit — Voltage
Connector Terminal
E59 32 Ground 0 V
Transfer control unit — Voltage
Connector Terminal
E59 32 Ground Battery voltage
IPDM E/R Transfer control unit Continuity
Connector Terminal Connector Terminal
E15 58 E59 32 Existed
Transfer control unit —Continuity
Connector Terminal
E59 32 Ground Not existed
Transfer control unit —Continuity
Connector Terminal
E60 46
Ground Existed
44
Revision: 2010 May2011 QX56

DLN-74
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P181B INCOMPLETE SELFSHUT
P181B INCOMPLETE SELFSHUT
DTC LogicINFOID:0000000006222274
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF.
2. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“P181B” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-74, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222275
1.CHECK TRANSFER CONTROL UNIT POWER SUPPLY (1)
1. Turn the ignition switch OFF.
2. Disconnect transfer control unit harness connector.
3. Check the voltage between transfer control unit harness connector and ground.
4. Turn the ignition switch ON. CAUTION:
Never start the engine.
5. Check the voltage between transfer control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK TRANSFER CONTROL UNIT POWER SUPPLY (2)
1. Turn the ignition switch OFF.
2. Check the 10A fuse (#34).
3. Check the harness for open or short between transfe r control unit harness connector No.20 terminal and
10A (#34).
Is the inspection result normal?
YES >> Perform the trouble diagnosis for power supply circuit. Refer to PG-11, "Wiring Diagram - BAT-
TERY POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
3.CHECK TRANSFER CONTROL UNIT GROUND
1. Turn the ignition switch OFF.
DTC Display item Malfunction detected condition Possible cause
P181B IMCOMP SELFSHUT When ignition switch is OFF and transfer
control unit power su
pply is lower or
higher than normal Self-shut is incomplete.
Transfer control unit
—Voltage
Connector Terminal
E59 20 Ground Battery voltage
Transfer control unit —Voltage
Connector Terminal
E59 20 Ground Battery voltage
Revision: 2010 May2011 QX56

DLN-76
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P181C TRANSFER MOTOR POWER SUPPLY
P181C TRANSFER MO
TOR POWER SUPPLY
DescriptionINFOID:0000000006222276
Supplies power to transfer control actuator (transfer motor).
DTC LogicINFOID:0000000006222277
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“P181C” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-76, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222278
1.CHECK TRANSFER MOTOR POWER SUPPLY (2)
Check the voltage between transfer control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK TRANSFER MOTOR POWER SUPPLY CIRCUIT (2)
1. Turn the ignition switch OFF.
2. Check the 30A fusible link (J).
3. Check the harness for open or short between transfe r control unit harness connector No.41 terminal and
30A fusible link (J).
Is the inspection result normal?
YES >> Perform the trouble diagnosis for power supply circuit. Refer to PG-11, "Wiring Diagram - BAT-
TERY POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
3.CHECK TERMINALS AND HARNESS CONNECTORS
Check the pin terminals for damage or loose connection with each harness connector.
Is the inspection result normal?
YES >> Replace transfer control unit. Refer to DLN-107, "Removal and Installation".
NO >> Repair or replace error-detected parts.
DTC Display item Malfunction detected condition Possible cause
P181C MOTOR POWER SUPPLY When transfer control actuator power
supply is lower or higher than normalMalfunction of transfer control actuator
(transfer motor) powe
r supply circuit
+ −
Voltag e
Transfer control unit
Connector Terminal E60 41 46 Battery voltage
Revision: 2010 May2011 QX56

P182B TRANSFER LOCK POSITION SENSOR
DLN-85
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
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P182B TRANSFER LOCK POSITION SENSOR
DTC LogicINFOID:0000000006222292
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Turn the 4WD shift switch AUTO ⇒4H ⇒4LO ⇒4H ⇒AUTO.
3. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“P182B” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-85, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222293
1.CHECK TRANSFER LOCK POSITION SENSOR
With CONSULT-III
1. Start the engine.
2. Turn the 4WD shift switch AUTO ⇒4H ⇒4LO ⇒4H ⇒AUTO.
3. Check “LOCK POSI SEN” of CONSULT-III “DATA MONITOR” for “ALL MODE AWD/4WD”.
What is the item on "DATA MONITOR"?
OPEN >> GO TO 7.
LOCK >> GO TO 7.
UNLEAN>>GO TO 6.
HI TEMP>>GO TO 5.
ERROR>> GO TO 5.
BAT >> GO TO 2.
GND >> GO TO 2.
2.CHECK TRANSFER LOCK POSITION POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect transfer positi on sensor harness connector.
3. Turn the ignition switch ON. CAUTION:
DTC Display item Malfunction detected condition Possible cause
P182B Lock POSITION SEN Malfunction related to transfer lock posi-
tion sensor has been detected. Transfer lock position sensor
- Transfer lock position sensor error
- Malfunction of transfer lock position
sensor circuit
Monitor item Condition Status
LOCK POSI SEN 4WD shift switch: AUTO or 4H OPEN
4WD shift switch: 4L LOCK
When transfer lock position sensor is unlearned. UNLEAN
When the temperature of transfer lock position sensor is
high.
HI TEMP
When transfer lock position sensor is malfunctioning. ERROR
When transfer lock position sensor signal circuit is short.
(Battery short) BAT
When transfer lock position sensor signal circuit is short.
(Ground short) GND
Revision: 2010 May2011 QX56