2011 INFINITI QX56 ignition

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

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

P1816 PARKING/NEUTRAL POSITION SWITCHDLN-69
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
C
EF
G H
I
J
K L
M A
B
DLN
N
O P
P1816 PARKING/NEUTRAL POSITION SWITCH
DTC LogicINFOID:0000000006222266
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Shift the A/T shift selector P position.
3. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“P1816” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-69, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222267
1.PERFORM TCM SELF-DIAGNOSIS
With CONSULT-III
Perform self-diagnosis for “TRANSMISSION”.
Is any DTCs detected?
YES >> Check the DTC.
NO >> GO TO 2.
2.ERASE SELF-DIAGNOSTIC RESULT
With CONSULT-III
1. Erase self-diagnostic results for “ALL MODE AWD/4WD”.
2. Start the engine and drive vehicle at 30 km/h (19 MPH) or more.
3. Check that A/T CHECK indictor lamp turns OFF.
Does A/T CHECK indicator lamp turn OFF?
YES >> GO TO 3.
NO >> Refer to TM-165, "
Symptom Table".
3.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
"P1816" is detected, 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
P1816 PNP SW/CIRC Malfunction is detected in PNP switch
signal that is output from TCM through
CAN communication Harness or connector (CAN communi-
cation line)
TCM
- Internal malfunction of TCM
- A/T shift selector error
Revision: 2010 May2011 QX56

DLN-70
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P1817 TRANSFER MOTOR
P1817 TRANSFER MOTOR
DTC LogicINFOID:0000000006222268
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
“P1817” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-70, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222269
1.CHECK TRANSFER MOTOR CIRCUIT (1)
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 unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.CHECK TRANSFER MOTOR
Check the transfer control actuator. Refer to DLN-71, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Transfer motor is malfunctioning. Repl ace transfer control actuator. Refer to DLN-114, "
Removal
and Installation".
3.CHECK TRANSFER INTERNAL FUNCTION
With CONSULT-III
1. Remove transfer control actuator. Refer to DLN-114, "
Removal and Installation".
DTC Display item Malfunction detected condition Possible cause
P1817 SHIFT ACTUATOR Malfunction is detected in transfer motor. Transfer control actuator
 Transfer motor error
 malfunction of transfer motor circuit
Transfer control unit Transfer control actuator
Continuity
Connector Terminal Connector Terminal
E60 45
F52 8
Existed
43 1
Transfer control unit —Continuity
Connector Terminal
E60 45
Ground Not existed
43
Revision: 2010 May2011 QX56

DLN-72
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P181A TRANSFER MOTOR TEMPERATURE SENSOR
P181A TRANSFER MOTOR TEMPERATURE SENSOR
DTC LogicINFOID:0000000006222271
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
“P181A” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-72, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222272
1.CHECK TRANSFER MOTOR TEMPERATURE SENSOR POWER SUPPLY
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 contro l actuator harness connector terminals.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK TRANSFER MOTOR TEMPERATURE 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
P181A MOTOR TEMP SEN When vehicle speed is 40km/h or more
and transfer motor temperature is lower
than normal
Transfer control actuator
 Malfunction of transfer motor temper-
ature sensor circuit. (open)
When transfer motor temperature is
higher than normal Transfer control actuator
 Malfunction of transfer motor temper-
ature sensor circuit. (short)
+ −
Voltag e
Transfer control actuator
Connector Terminal F52 4 7 Approx. 5 V
Transfer control unit Transfer control actuator Continuity
Connector Terminal Connector Terminal
E59 28
F52 4
Existed
97
Revision: 2010 May2011 QX56

P181A TRANSFER MOTOR TEMPERATURE SENSOR
DLN-73
< 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 MOTOR TEMPERATURE SENSOR
Check the transfer control actuator. Refer to DLN-73, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Transfer motor temperature sensor is malfuncti oning. Replace transfer control actuator. Refer to
DLN-114, "
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:0000000006222273
1.CHECK TRANSFER MOTOR TEMPERATURE SENSOR
1. Turn the ignition switch OFF.
2. Disconnect transfer control actuator harness connector.
3. Check the resistance between transfer cont rol actuator harness connector terminals.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Transfer motor temperature sensor is malfuncti oning. Replace transfer control actuator. Refer to
DLN-114, "
Exploded View".
Transfer control actuator —Continuity
Connector Terminal
F52 7 Ground Not existed
Transfer control actuator Condition Resistance
Te r m i n a l
47 20
°C (68 °F) Approx. 12.5 k Ω
80 °C (176 °F) Approx. 1.3 k Ω
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