INFINITI QX56 2011 Factory Service Manual

P180E SENSOR POWER SUPPLY (8V)DLN-59
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
C
EF
G H
I
J
K L
M A
B
DLN
N
O P
P180E SENSOR POWER SUPPLY (8V)
DescriptionINFOID:0000000006222255
Supplies power (8V) to transfer internal speed sensor.
DTC LogicINFOID:0000000006222256
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch ON.
2. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“P180E” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-59, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222257
1.CHECK TRANSFER INTERNAL SPEED SENSOR POWER SUPPLY (1)
1. Turn the ignition switch OFF.
2. Disconnect transfer control actuator harness connector.
3. Turn the ignition switch ON. CAUTION:
Never start the engine.
4. Check the voltage between transfer cont rol actuator harness connector terminals.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK TRANSFER INTERNAL SPEED 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 control actuator harness connector and ground.
DTC Display item Malfunction detected condition Possible cause
P180E SEN POWER SUPPLY (8V) When the sensor power supply (8V) volt-
age is lower or higher than normal.Malfunction of transfer internal speed
sensor power supply circuit (open or
short)
+
−
Vo l ta g e
Transfer control actuator
Connector Terminal F52 3 7 Approx. 8 V
Transfer control unit Transfer control actuator Continuity
Connector Terminal Connector Terminal
E59 39
F52 3
Existed
97
Revision: 2010 May2011 QX56

DLN-60
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P180E SENSOR PO
WER SUPPLY (8V)
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
3.CHECK TRANSFER INTERNAL SPEED SENSOR POWER SUPPLY (2)
1. Turn the ignition switch OFF.
2. Connect transfer control actuator harness connector.
3. Turn the ignition switch ON. CAUTION:
Never start the engine.
4. Check the voltage between transfer contro l actuator harness connector terminals.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Transfer internal speed sensor is malfunctioni ng. Replace transfer control actuator. Refer to DLN-
114, "Removal and Installation".
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.
Transfer control actuator —Continuity
Connector Terminal
F52 7 Ground Not existed
+ −
Voltag e
Transfer control actuator
Connector Terminal F52 3 7 Approx. 8 V
Revision: 2010 May2011 QX56

P180F TRANSFER INTERNAL SPEED SENSORDLN-61
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
C
EF
G H
I
J
K L
M A
B
DLN
N
O P
P180F TRANSFER INTE RNAL SPEED SENSOR
DTC LogicINFOID:0000000006222258
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
“P180F” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-61, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222259
1.CHECK TRANSFER INTERNAL SPEED SENSOR SIGNAL
1. Turn the ignition switch ON.
2. Check the voltage between transfer control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 2.
2.CHECK TRANSFER INTERNAL SPEED SENSOR POWER SUPPLY
DTC Display item Malfunction detected condition Possible cause
P180F MOTOR SYSTEM  Malfunction is detected in transfer mo-
tor.
 Malfunction is detected in transfer in- ternal speed sensor. Transfer control actuator
 Transfer motor error
 Transfer internal speed sensor circuit
error
 Transfer assembly internal malfunc-
tion.
+
— Condition Voltage
Transfer control unit
Connector Terminal
E59 10 Ground
4WD mode: AUTO
A/T shift selector: N
Depress accelerator pedal several time
31 Ground NOTE:
When changing the transfer motor
rotation direction.
JPDIE0267GB
JPDIE0269GB
Revision: 2010 May2011 QX56

DLN-62
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P180F TRANSFER INTE
RNAL SPEED SENSOR
1. Turn the ignition switch OFF.
2. Disconnect transfer control actuator harness connector.
3. Turn the ignition switch ON.
4. Check the voltage between transfer contro l actuator harness connector terminals.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK TRANSFER INTERNAL SPEED 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 control actuator har-
ness connector.
4. Check the continuity between transfer control actuator harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace error-detected parts.
4.CHECK TRANSFER INTERNAL S PEED 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 control actuator har-
ness connector.
4. Check the continuity between transfer control actuator harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace error-detected parts.
+ −
Voltag e
Transfer control actuator
Connector Terminal F52 3 7 8V
Transfer control unit Transfer control actuator Continuity
Connector Terminal Connector Terminal
E59 39
F52 3
Existed
97
Transfer control actuator —Continuity
Connector Terminal
F52 3 Ground Not existed
Transfer control unit Transfer control actuator Continuity
Connector Terminal Connector Terminal
E59 10
F52 2
Existed
31 6
Transfer control actuator —Continuity
Connector Terminal
F52 2
Ground Not existed
6
Revision: 2010 May2011 QX56

P180F TRANSFER INTERNAL SPEED SENSORDLN-63
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
C
EF
G H
I
J
K L
M A
B
DLN
N
O P
5.REPLACE TRANSFER CONTROL ACTUATOR
1. Replace transfer control actuator. Refer to DLN-114, "
Removal and Installation".
2. Perform confirmation procedure again. Refer to DLN-57, "
DTC Logic".
Is DTC
“P180F” detected?
YES >> GO TO 6.
NO >> INSPECTION END
6.CHECK TRANSFER INTERNAL FUNCTION
With CONSULT-III
1. Remove transfer control actuator. Refer to DLN-114, "
Removal and Installation".
2. Turn the actuator shaft. Refer to DLN-114, "
Inspection".
3. Check “ROTARY POSI SEN” of CONSULT-II I “DATA MONITOR” for “ALL MODE AWD/4WD”.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Transfer assembly is mechanical malfunction. Replace transfer assembly. Refer to DLN-121,
"Removal and Installation".
7.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.
Monitor item Condition Status
ROTARY POSI SEN Turn the actuator shaft. Value is changing
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]
C
EF
G H
I
J
K L
M A
B
DLN
N
O P
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-66
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P1811 POWER SUPPLY CIRCUIT
FOR TRANSFER CONTROL UNIT
Check the transfer control unit pin terminals fo r damage or loose connection with 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.
Revision: 2010 May2011 QX56

P1813 4WD MODE SWITCHDLN-67
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
C
EF
G H
I
J
K L
M A
B
DLN
N
O P
P1813 4WD MODE SWITCH
DTC LogicINFOID:0000000006222263
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
“P1813” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-67, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222264
1.CHECK TRANSFER SHIFT SWITCH
Check 4WD switch assembly. Refer to DLN-68, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> 4WD shift switch is malfunctioning. Replace 4WD switch assembly. Refer to DLN-108, "
Removal
and Installation".
2.CHECK 4WD SHIFT SWITCH CIRCUIT (1)
1. Disconnect transfer control unit harness connector.
2. Check the continuity between transfer control uni t harness connector and 4WD switch assembly harness
connector.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
DTC Display item Malfunction detected condition Possible cause
P1813 4WD MODE SW Multiple signals received from 4WD shift
switch are detected. 4WD switch assembly
- Internal malfunction of 4WD switch
assembly
- Malfunction of 4WD switch assembly circuit
 Transfer control unit
Transfer control unit 4WD switch assembly Continuity
Connector Terminal Connector Terminal
E59 11
M54 11 E x i s t e d
10 Not existed 9 Not existed
35 11 N o t e x i s t e d
10 Existed 9 Not existed
14 11 N o t e x i s t e d
10 Not existed 9 Existed
Revision: 2010 May2011 QX56

DLN-68
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P1813 4WD MODE SWITCH
3.CHECK 4WD SHIFT SWITCH CIRCUIT (2)
Check the continuity between 4WD switch assembly 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.
 Check 4WD switch assembly pin terminals fo r damage or loose connection with 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:0000000006222265
1.CHECK 4WD SHIFT SWITCH
1. Turn the ignition switch OFF.
2. Remove 4WD switch assembly. Refer to DLN-108, "
Removal and Installation".
3. Check the continuity between 4WD switch assembly harness connector terminals.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace 4WD switch assembly. Refer to DLN-108, "
Removal and Installation".
4WD switch assembly
—Continuity
Connector Terminal
M54 11
Ground Not existed
10
9
4WD switch assembly Condition Continuity
Te r m i n a l
12 9 4WD shift switch: AUTO Existed
4WD shift switch: 4H or 4L Not existed
12 10 4WD shift switch: 4H Existed
4WD shift switch: AUTO or 4L Not existed
12 11 4WD shift switch: 4L Existed
4WD shift switch: AUTO or 4H Not existed
Revision: 2010 May2011 QX56