2011 INFINITI QX56 check engine

DLN-52
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P1807 OUT PUT SHAFT SPEED SENSOR
P1807 OUT PUT SHAFT SPEED SENSOR
DTC LogicINFOID:0000000006222246
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Start the engine and drive at 30 km/h (19 MPH) or more for approximately 1minute.
2. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“P1807” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-52, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222247
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
"P1807" 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
P1807 VHCL SPEED SEN-AT  Malfunction is detected in output
speed signal that is output from TCM
through CAN communication.
 Improper signal is input while driving.  Harness or connector (CAN communi-
cation line)
TCM
- Internal malfunction of TCM
- Output speed signal error
Revision: 2010 May2011 QX56

P1808 WHEEL SPEED SENSORDLN-53
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
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P1808 WHEEL SPEED SENSOR
DTC LogicINFOID:0000000006222248
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Start the engine and drive at 30 km/h (19 MPH) or more for approximately 1minute.
2. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“P1808” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-53, "DTC Logic".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222249
1.PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS
With CONSULT-III
Perform self-diagnosis for “ABS”.
Is any DTCs detected?
YES >> Check the DTCs.
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 ABS warning lamp turns OFF.
Does ABS warning lamp turn OFF?
YES >> GO TO 3.
NO >> Refer to BRC-122, "
Diagnosis Procedure".
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
"P1808" 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
P1808 VHCL SPEED SEN-ABS  Malfunction is detected in vehicle
speed signal that is output from ABS
actuator and electric unit (control unit)
through CAN communication.
 Improper signal is input while driving.  Harness or connector (CAN communi-
cation line)
 Malfunction of ABS actuator and elec-
tric unit (control unit)
- Malfunction of ABS actuator and elec-
tric unit (control unit) circuit error
- Vehicle speed signal error
Revision: 2010 May2011 QX56

DLN-54
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P180C SENSOR POWER SUPPLY (5V)
P180C SENSOR POWER SUPPLY (5V)
DescriptionINFOID:0000000006222250
Supplies power (5V) to transfer lock position sensor and transfer rotary position sensor.
DTC LogicINFOID:0000000006222251
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
“P180C” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-54, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222252
1.CHECK TRANSFER LOCK POSITION SENSOR POWER SUPPLY (1)
1. Turn the ignition switch OFF.
2. Disconnect transfer lock position sensor harness c onnector and transfer rotary position sensor harness
connector.
3. Turn the ignition switch ON.
CAUTION:
Never start the engine.
4. Check the voltage between transfer lock position sensor harness connector terminals.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK TRANSFER LOCK POSITION 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 lock position sensor
harness connector.
DTC Display item Malfunction detected condition Possible cause
P180C SEN POWER SUPPLY (5V) When the sensor power supply (5V) volt-
age is lower or higher than normal. Malfunction of transfer lock position
sensor power supply circuit (open or
short)
 Malfunction of transfer rotary position
sensor power supply circuit (open or
short)
+ −
Voltag e
Transfer lock position sensor
Connector Terminal F40 1 2 Approx. 5 V
Revision: 2010 May2011 QX56

P180C SENSOR POWER SUPPLY (5V)DLN-55
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
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4. Check the continuity between transfer lo ck position sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
3.CHECK TRANSFER LOCK POSITION SENSOR POWER SUPPLY (2)
1. Turn the ignition switch OFF.
2. Connect transfer lock position sensor harness connector.
3. Turn the ignition switch ON. CAUTION:
Never start the engine.
4. Check the voltage between transfer lock pos ition sensor harness connector terminals.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace transfer lock position sensor. Refer to DLN-119, "
Removal and Installation".
4.CHECK TRANSFER ROTARY POSITION SENSOR POWER SUPPLY (1)
1. Turn the ignition switch OFF.
2. Connect transfer control unit harness connector.
3. Turn the ignition switch ON. CAUTION:
Never start the engine.
4. Check the voltage between transfer rotary position sensor harness connector terminals.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.CHECK TRANSFER ROTARY POSITION 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 rotary position sensor
harness connector.
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
+ −
Vo l ta g e
Transfer lock position sensor
Connector Terminal F40 1 2 Approx. 5 V
+ −
Vo l ta g e
Transfer rotary position sensor
Connector Terminal F41 1 2 Approx. 5 V
Revision: 2010 May2011 QX56

DLN-56
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P180C SENSOR POWER SUPPLY (5V)
4. Check the continuity between transfer rotary position sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace error-detected parts.
6.CHECK TRANSFER ROTARY POSITION SENSOR POWER SUPPLY (2)
1. Turn the ignition switch OFF.
2. Connect transfer lock position sensor harness connector.
3. Turn the ignition switch ON. CAUTION:
Never start the engine.
4. Check the voltage between transfer rotary position sensor harness connector terminals.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Replace transfer rotary position sensor. Refer to DLN-117, "
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.
Transfer control unit Transfer rotary position sensor Continuity
Connector Terminal Connector Terminal
E59 18
F41 1
Existed
16 2
Transfer rotary position sensor —Continuity
Connector Terminal
F41 1 Ground Not existed
+ −
Voltag e
Transfer rotary position sensor
Connector Terminal F41 1 2 Approx. 5 V
Revision: 2010 May2011 QX56

P180D TRANSFER ROTARY POSITION SENSORDLN-57
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
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P180D TRANSFER ROTARY POSITION SENSOR
DTC LogicINFOID:0000000006222253
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
“P180D” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-57, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222254
1.CHECK TRANSFER ROTARY POSITION 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 ROTARY POSI TION SENSOR POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect transfer rotary pos ition sensor harness connector.
3. Turn the ignition switch ON.
CAUTION:
Never start the engine.
4. Check the voltage between transfer rotary position sensor harness connector terminals.
DTC Display item Malfunction detected condition Possible cause
P180D ROTARY POSITION SEN Malfunction is detected in transfer rotary
position sensor.Transfer rotary position sensor
 Transfer rotary po
sition sensor error
 Transfer rotary posi tion sensor circuit
error
+
−Vol tag e
Transfer control unit
Connector Terminal
E59 15 Ground
JPDIE0268GB
+ −
Vo l ta g e
Transfer rotary position sensor
Connector Terminal F41 1 2 Approx. 5 V
Revision: 2010 May2011 QX56

P180E SENSOR POWER SUPPLY (8V)DLN-59
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
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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