ABS INFINITI QX56 2011 Factory Service Manual

DLN-10
< SYSTEM DESCRIPTION >[TRANSFER: ATX90A]
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006222214
1. ECM
Refer to EC-16, "
Component Parts
Location". 2. ABS actuator and electric unit (con-
trol unit)
Refer to BRC-10, "Component Parts
Location". 3. Steering angle sensor
Refer to BRC-10, "
Component Parts
Location".
4. Control valve & TCM Refer to TM-10, "
A/T CONTROL
SYSTEM : Compon ent Parts Loca-
tion". 5. Transfer control unit 6. 4WD switch assembly
7. Transfer lock position sensor 8. Transfer Hi-Lo position sensor 9. Transfer rotary position sensor
10. Transfer control actuator 11. Transfer fluid temperature sensor
A. Back of glove box assembly B. 4WD indicator lamp, 4WD warning lamp, ATP warning lamp (in combina-
tion meter)C. Console assembly
D. Transfer assembly upper side E. Transfer assembly under side
JPDIE0270GB
Revision: 2010 May2011 QX56

COMPONENT PARTSDLN-11
< SYSTEM DESCRIPTION > [TRANSFER: ATX90A]
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Component DescriptionINFOID:0000000006222215
Transfer Control UnitINFOID:0000000006222216
 Transfer control unit operates transfer control act uator, 4WD warning lamp and 4WD mode indicator lamp
according to input signal from 4WD shift switch and each sensor and control unit.
 When 4WD system is malfunctioning, 4WD warning la mp turns ON and fail-safe status activates.
 When protection is necessary, 4WD warning la mp blinks and protection status activates.
Transfer Control ActuatorINFOID:0000000006222217
Transfer control actuator integrates transfer motor, transfer internal position sensor, and transfer motor tem-
perature sensor, and switches 4WD mode (AUTO ⇔4H ⇔4L).
TRANSFER MOTOR
Transfer motor operates according to signal from transfer control unit and switches 4WD mode
(AUTO ⇔4H ⇔4L). It also performs front and rear distri bution of traction force during AUTO mode.
TRANSFER INTERNAL SPEED SENSOR
Transfer internal speed sensor detects rotation status of transfer motor and transmits signal to transfer control
unit.
TRANSFER MOTOR TEMPERATURE SENSOR
 Transfer motor temperature sensor m easures temperature of transfer motor.
Component parts Reference/Function
Transfer control unit DLN-11, "
Transfer Control Unit"
Transfer control actua-
torTransfer motor
DLN-11, "
Transfer Control Actuator"
Transfer internal speed
sensorDLN-11, "Transfer Control Actuator"
Transfer motor temper-
ature sensor
DLN-11, "Transfer Control Actuator"
Transfer Hi-Lo position sensor
DLN-12, "Transfer Hi-Lo Position Sensor"
Transfer rotary position sensorDLN-12, "Transfer Rotary Position Sensor"
Transfer lock position sensorDLN-12, "Transfer Lock Position Sensor"
Transfer fluid temperature sensorDLN-12, "Transfer Fluid Temperature Sensor"
4WD mode switchDLN-18, "4WD SYSTEM : System Description"
4WD indicator lampDLN-18, "4WD SYSTEM : System Description"
4WD warning lampDLN-18, "4WD SYSTEM : System Description"
AT P w a r n i n g l a m pDLN-18, "4WD SYSTEM : System Description"
ABS actuator and electric unit (control unit)Transmits the following signals via CAN communication line to transfer control unit.
 Vehicle speed signal (ABS)
 Stop lamp switch signal (brake signal)
 ABS operation signal
 VDC operation signal
 TCS operation signal
Steering angle sensor Transmits the following signals via CAN communication line to transfer control unit.
 Steering angle sensor signal
ECM Transmits the following signals via CAN communication line to transfer control unit.
 Accelerator pedal position signal
 Engine speed signal
 Engine torque signal
TCM Transmits the following signals via CAN communication line to transfer control unit.
 Shift position signal
 Gear position signal
 Output shaft revolution signal
Revision: 2010 May2011 QX56

DLN-18
< SYSTEM DESCRIPTION >[TRANSFER: ATX90A]
SYSTEM
SYSTEM
4WD SYSTEM
4WD SYSTEM : System DescriptionINFOID:0000000006222224
 In AUTO mode, distribution of traction force is cont
rolled from 2WD status (0:100) to 4WD status (50:50)
according to signal from each sensor and switch.
 In accordance with fail-safe function, when system is malfunctioning, 4WD warning lamp on combination meter turns ON and 4WD control stops. For fail-safe function, refer to DLN-20, "
4WD SYSTEM : Fail-Safe".
 When a high load status continues for transfer assembly (transfer control actuator or transfer fluid), 4WD
control temporarily becomes 4H or 2WD status, according to protection function.
NOTE:
4WD system is not malfunctioning.
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL
It transmits/receives each signal from the followi ng transfer control unit via CAN communication line.
JPDIE0272GB
Component parts Control signal
ABS actuator and electric unit (control unit) Transmits the following signals via CAN communication line to transfer control unit.
 Vehicle spee
d signal (ABS)
 Stop lamp switch signal (brake signal)
 ABS operation signal
 VDC operation signal
 TCS operation signal
ECM Transmits the following signals via CAN communication line to transfer control unit.
 Accelerator pedal position signal
 Engine speed signal
 Engine torque signal
Revision: 2010 May2011 QX56

DLN-22
< SYSTEM DESCRIPTION >[TRANSFER: ATX90A]
DIAGNOSIS SYSTEM (T
RANSFER CONTROL UNIT)
ABS OPER [On/Off] X ABS operation status via CAN communication
line is displayed.
SAND MODE IND [On/Off] This indicator is not equipped, but it is dis-
played.
ROCK MODE IND [On/Off] This indicator is not equipped, but it is dis-
played.
SNOW MODE IND [On/Off] This indicator is not equipped, but it is dis-
played.
ONROAD MODE IND [On/Off] This indicator is not equipped, but it is dis-
played.
SAND MODE SW [On/Off] X This switch is not equipped, but it is displayed.
ROCK MODE SW [On/Off] X This switch is not equipped, but it is displayed.
SNOW MODE SW [On/Off] X This switch is not equipped, but it is displayed.
ONROAD MODE SW [On/Off] X This switch is not equipped, but it is displayed.
HI/LO POSI SEN 3 [On/Off] X Transfer Hi-Lo position sensor (3) status is dis-
played.
HI/LO POSI SEN 1 [On/Off] X Transfer Hi-Lo position sensor (1) status is dis-
played.
LOCK POSI SEN [OPEN/LOCK/BAT/UNLEAN/HI
TEMP/ERROR/GND] X
Transfer lock position sensor signal is dis-
played.
ATP IND [On/Off] Control status of ATP warning lamp is dis-
played.
4WD FAILLAMP [On/Off] X Control status of ATP warning lamp is dis-
played.
4WD MODE IND [4L/LOCK/AUTO] X Control status of 4WD mode indicator lamp is
displayed.
(LOCK means 4H of 4WD mode)
MOTOR DRIVE B [HI/LO/PWM] X Driving status of transfer motor is displayed.
(Reverse side)
MOTOR DRIVE A [HI/LO/PWM] X Driving status of transfer motor is displayed.
(Drive side)
FLUID TEMP SEN [V] X Temperature of transfer fluid is displayed.
MOTOR TEMP [V] X Temperature of transfer motor is displayed.
C/U POWER SUP [V] X Power supply voltage value of transfer control
unit is displayed.
MOTOR POWER SUP [V] X Power supply voltage value of transfer motor
unit is displayed.
ROTARY POSI SEN [%] X Transfer rotary position sensor signal is dis-
played.
THRTL POSI SEN [%] X X Throttle opening status via CAN communica-
tion line is displayed.
AT R SPEED [km/h] X Output shaft revolution speed via CAN commu-
nication line is displayed.
T/M GEAR [0 - 7] X Current transmission gear via CAN communi-
cation line is displayed.
COMPR VHCL SPEED [km/h] X Vehicle speed calculated by transfer control
unit is displayed.
VHCL/S SEN-FR [km/h] X Wheel speed (front) average calculated by
transfer control.
Monitor item (Unit)
SELECT MONITOR ITEM
Remarks
ECU INPUT
SIGNALS MAIN SIG-
NALS
Revision: 2010 May2011 QX56

DLN-24
< ECU DIAGNOSIS INFORMATION >[TRANSFER: ATX90A]
TRANSFER CONTROL UNIT
ECU DIAGNOSIS INFORMATION
TRANSFER CONTROL UNIT
Reference ValueINFOID:0000000006222227
VALUES ON THE DIAGNOSIS TOOL
Monitor item Condition Value/Status
4WD MODE IGN ON 4WD is booting BOTNG
4WD mode is switching SWTNG
4WD mode: 4L 4L
4WD mode: 4H 4H
4WD mode: AUTO AUTO
2WD SWITCH
*1Always OFF
AUTO SWITCH 4WD shift switch: AUTO ON
4WD shift switch: 4H or 4L OFF
4H SWITCH 4WD shift switch: 4H ON
4WD shift switch: AUTO or 4L OFF
4L SWITCH 4WD shift switch: 4L ON
4WD shift switch: AUTO or 4H OFF
T/M RANGE A/T shift selector: D D
A/T shift selector: N N
A/T shift selector: R R
A/T shift selector: P P
N RANGE SW A/T shift selector: N ON
A/T shift selector: Except N OFF
R RANGE SW A/T shift selector: R ON
A/T shift selector: Except R OFF
IGN SW IGN SW: ON ON
IGN SW: OFF OFF
TCS OPER SW TCS is operating ON
TCS is not operating OFF
VDC OPER SW VDC is operating ON
VDC is not operating OFF
ABS OPER SW ABS is operating ON
ABS is not operating OFF
SAND MODE IND
*2Always OFF
ROCK MODE IND
*2Always OFF
SNOW MODE IND
*2Always OFF
ONROAD MODE IND
*2Always ON
SAND MODE SW
*3Always OFF
ROCK MODE SW
*3Always OFF
SNOW MODE SW
*3Always OFF
ONROAD MODE SW
*3Always ON
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-30
< ECU DIAGNOSIS INFORMATION >[TRANSFER: ATX90A]
TRANSFER CONTROL UNIT
P181C MOTOR POWER SUPPLY
DLN-76, "DTC Logic"
P181E ST ANGLE SEN SIGDLN-77, "DTC Logic"
P181F INCOMP CALIBRATIONDLN-78, "DTC Logic"
P1826 OIL TEMP SENDLN-80, "DTC Logic"
P1820 ENGINE SPEED SIGDLN-79, "DTC Logic"
P1829 THROTTLE POSI SENDLN-82, "DTC Logic"
P182A HI-LO POSITION SEN DLN-83, "DTC Logic"
P182B LOCK POSITION SENDLN-85, "DTC Logic"
P1830 ABS OP SIGDLN-88, "DTC Logic"
P1831 VDC OP SIGDLN-89, "DTC Logic"
P1832 TCS OP SIGDLN-90, "DTC Logic"
U1000 CAN COMM CIRCUIT DLN-91, "DTC Logic"
U1010 CONTROL UNIT (CAN)DLN-92, "DTC Logic"
DTC Display Items Reference
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

P181E STEERING ANGLE SENSORDLN-77
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
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P181E STEERING ANGLE SENSOR
DTC LogicINFOID:0000000006222279
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
“P181E” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-77, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222280
1.PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS
With CONSULT-III
Perform self-diagnosis for “ABS”.
Is DTC
“C1143” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-97, "Diagnosis Procedure".
NO >> GO TO 2.
2.CHECK CAN COMMUNICATION LINE
Check communication line. Refer to LAN-69, "
Diagnosis Procedure".
Is 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
P181E ST ANGLE SEN SIG Malfunction is detected in steering angle
sensor signal through CAN communica-
tion. Harness or connector (CAN communi-
cation line)
 Steering angle sensor
- Steering angle sensor error
- Malfunction of steering angle sensor circuit error
Revision: 2010 May2011 QX56

DLN-88
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P1830 ABS OPERATION SIGNAL
P1830 ABS OPERATION SIGNAL
DTC LogicINFOID:0000000006222294
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.
2. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“P1830” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-88, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222295
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-123, "
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
"P1830" 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
P1830 ABS OP SIG Malfunction is detect
ed in ABS operation
signal that is outp ut from ABS actuator
and electric unit (control unit) through
CAN communication. Malfunction of ABS system
Revision: 2010 May2011 QX56