2011 INFINITI QX56 ground

P181B INCOMPLETE SELFSHUTDLN-75
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
C
EF
G H
I
J
K L
M A
B
DLN
N
O P
2. Check the continuity between transfer control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK TERMINALS AND HARNESS CONNECTORS
Check transfer control unit pin terminals for damage or loose connection with harness connector.
Is inspection result normal?
YES >> After turning the ignition switch OFF, perform DTC confirmation procedure again. When DTC
"P181B" is detected, Replace transfer control unit. Refer to DLN-107, "
Removal and Installation".
NO >> Repair or replace error-detected parts.
Transfer control unit —Continuity
Connector Terminal
E60 44
Ground Existed
46
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

DLN-80
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P1826 TRANSFER FLUID TEMPERATURE
P1826 TRANSFER FLUID TEMPERATURE
DTC LogicINFOID:0000000006222285
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Start the engine and drive at 40 km/h (25 MPH) or more for approximately 1minute.
2. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“P1826” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-80, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222286
1.CHECK TRANSFER FLUID TEMPER ATURE SENSOR POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect transfer fluid temperature sensor harness connector.
3. Turn the ignition switch ON. CAUTION:
Never start the engine.
4. Check the voltage between transfer fluid temperature sensor harness connector terminals.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK TRANSFER FLUID TE MPERATURE SENSOR CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect transfer control unit harness connector.
3. Check the continuity between transfer control uni t harness connector and transfer control actuator har-
ness connector.
4. Check the continuity between transfer flui d temperature sensor harness connector and ground.
DTC Display item Malfunction detected condition Possible cause
P1826 OIL TEMP SEN When vehicle speed is 40km/h or more
and transfer fluid temperature is lower
than normal
Transfer fluid temperature
 Malfunction of transfer fluid tempera-
ture sensor circuit (open)
When transfer fluid temperature is high-
er than normal Transfer fluid temperature
 Malfunction of transfer fluid tempera-
ture sensor circuit (short)
+ −
Voltag e
Transfer fluid temperature sensor
Connector Terminal F37 2 1 Approx. 5 V
Transfer control unit Transfer fluid temperature sensor Continuity
Connector Terminal Connector Terminal
E59 7
F37 2
Existed
36 1
Revision: 2010 May2011 QX56

P1826 TRANSFER FLUID TEMPERATURE
DLN-81
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
C
EF
G H
I
J
K L
M A
B
DLN
N
O P
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
3.CHECK TRANSFER FLUID TEMPERATURE SENSOR
Check the transfer fluid temperature sensor. Refer to DLN-81, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace transfer fluid temperature sensor. Refer to DLN-120, "
Exploded View".
4.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.
Component InspectionINFOID:0000000006222287
1.CHECK TRANSFER FLUID TEMPERATURE SENSOR
1. Turn the ignition switch OFF.
2. Disconnect transfer fluid temper ature sensor harness connector.
3. Check the resistance between transfer control fluid temperature sensor connector terminals.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace transfer fluid temperature sensor. Refer to DLN-120, "
Exploded View".
Transfer fluid temperature sensor
—Continuity
Connector Terminal
F37 2 Ground Not existed
Transfer fluid temperature sensor Condition Resistance
Te r m i n a l
21 20
°C (68 °F) Approx. 2.5 k Ω
80 °C (176 °F) Approx. 0.3 k Ω
Revision: 2010 May2011 QX56

P182A TRANSFER HI-LO POSITION SENSOR
DLN-83
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
C
EF
G H
I
J
K L
M A
B
DLN
N
O P
P182A TRANSFER HI-LO POSITION SENSOR
DTC LogicINFOID:0000000006222290
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Start the engine. CAUTION:
Never drive the vehicle.
2. Turn the 4WD shift switch AUTO ⇒4H ⇒4LO ⇒4H ⇒AUTO.
3. Drive at 20 km/h (12MPH) or more for 1 minute or more.
4. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“P182A” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-83, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222291
1.CHECK TRANSFER HI-LO POSITION SENSOR SIGNAL
1. Turn the ignition switch ON. CAUTION:
Never start the engine.
2. Check the voltage between transfer control unit harness connector and ground.
CAUTION:
After operating 4WD shift sw itch, move the vehicle back and forth to check voltage.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 2.
2.CHECK TRANSFER HI-LO POSITION SENSOR POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect transfer Hi-Lo position sensor harness connector.
3. Turn the ignition switch ON. CAUTION:
Never start the engine.
4. Check the voltage between transfer Hi-Lo position sensor harness connector terminals.
DTC Display item Malfunction detected condition Possible cause
P182A HI-LO POSITION SEN Malfunction related to transfer Hi-Lo po-
sition sensor has been detected.Internal malfunction of transfer Hi-Lo po-
sition sensor
+
−Condition Voltage
Transfer control unit
Connector Terminal
E59 6
Ground4WD mode: AUTO or 4H Approx. 0 V
4WD mode: 4L Approx. 5 V
25 4WD mode: AUTO or 4H Approx. 0 V
4WD mode: 4L Approx. 5 V
Revision: 2010 May2011 QX56

DLN-84
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P182A TRANSFER HI-LO POSITION SENSOR
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK TRANSFER HI-LO POSITION SENSOR CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect transfer control unit harness connector.
3. Check the continuity between transfer control unit harness connector and transfer Hi-Lo position sensor
harness connector.
4. Check the continuity between transfer Hi- Lo position sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.REPLACE TRANSFER HI-LO POSITION SENSOR
1. Replace transfer Hi-Lo position sensor. Refer to DLN-116, "
Exploded View".
2. Perform confirmation procedure again. Refer to DLN-83, "
DTC Logic".
Is DTC
“P182A” detected?
YES >> GO TO 5.
NO >> INSPECTION END
5.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.
+
−Voltag e
Transfer Hi-Lo position sensor
Connector Terminal
F42 1
Ground Approx. 5 V
2
Transfer control unit Transfer Hi-Lo position sensor Continuity
Connector Terminal Connector Terminal
E59 6
F42 1
Existed
25 2
29 3
Transfer Hi-Lo position sensor —Continuity
Connector Terminal
F42 1
Ground Not existed
2
3
Revision: 2010 May2011 QX56

P182B TRANSFER LOCK POSITION SENSOR
DLN-85
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
C
EF
G H
I
J
K L
M A
B
DLN
N
O P
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

DLN-86
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P182B TRANSFER LOCK POSITION SENSOR
Never start the engine.
4. Check the voltage between transfer position sensor harness connector terminals.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK TRANSFER LOCK POSITION SENSOR POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect transfer control unit harness connector.
3. Check the continuity between transfer control uni t harness connector and transfer lock position sensor
harness connector.
4. Check the continuity between transfer lock position harness connector and ground.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace error-detected parts.
4.CHECK TRANSFER LOCK POSITI ON SENSOR SIGNAL CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect transfer control unit harness connector.
3. Check the continuity between transfer control uni t harness connector and transfer lock position sensor
harness connector.
4. Check the continuity between transfer lock position harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace error-detected parts.
5.REPLACE TRANSFER LOCK POSITION SENSOR
1. Replace transfer lock position sensor. Refer to DLN-119, "
Removal and Installation".
2. Perform confirmation procedure again. Refer to DLN-85, "
DTC Logic".
Is the inspection result normal?
+ −
Voltag e
Transfer lock position sensor
Connector Terminal F40 1 2 Approx. 5 V
Transfer control unit Transfer lock position sensor Continuity
Connector Terminal Connector Terminal
E59 17
F40 1
Existed
30 2
Transfer lock position sensor -Continuity
Connector Terminal
F40 1 Ground Not existed
Transfer control unit Transfer lock position sensor Continuity
Connector Terminal Connector Terminal
E59 38 F40 3 Existed
Transfer lock position sensor -Continuity
Connector Terminal
F40 3 Ground Not existed
Revision: 2010 May2011 QX56