diagram INFINITI QX56 2010 Factory Service Manual

BCM (BODY CONTROL MODULE)DLK-157
< ECU DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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Wiring Diagram — POWE R DOOR LOCK SYSTEM —INFOID:0000000005147021
ABKWA0521GB
Revision: April 20092010 QX56

DLK-178
< ECU DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
INTELLIGENT KEY UNIT
Wiring Diagram — INTELLI GENT KEY SYSTEM —
INFOID:0000000005147027
ABKWA0486GB
Revision: April 20092010 QX56

BACK DOOR CONTROL UNITDLK-199
< ECU DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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Wiring Diagram—AUTOMATIC BACK DOOR SYSTEM—INFOID:0000000005147030
ABKWA0459GB
Revision: April 20092010 QX56

DLN-1
TRANSMISSION & DRIVELINE
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SECTION DLN
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CONTENTS
DRIVELINE
ATX14B
BASIC INSPECTION ....... .............................
6
DIAGNOSIS AND REPAIR WORKFLOW ..... .....6
Work Flow ........................................................... ......6
Preliminary Check .....................................................7
FUNCTION DIAGNOSIS ..............................10
4WD SYSTEM ................................................ ....10
System Diagram .................................................. ....10
System Description .................................................11
Component Parts Location ......................................16
CAN Communication ...............................................17
DIAGNOSIS SYSTEM (TRANSFER CON-
TROL UNIT) ........................................................
18
CONSULT-III Function (ALL MODE AWD/4WD) ....18
COMPONENT DIAGNOSIS .........................22
P1811 POWER SUPPLY CIRCUIT FOR
TRANSFER CONTROL UNIT ........................ ....
22
Description .......................................................... ....22
DTC Logic ...............................................................22
Diagnosis Procedure ...............................................22
Component Inspection ............................................23
P1802 – P1804, P1809 TRANSFER CON-
TROL UNIT .........................................................
25
Description ..............................................................25
DTC Logic ...............................................................25
Diagnosis Procedure ...............................................25
P1807 VEHICLE SPEED SENSOR (A/T) ..........27
Description .......................................................... ....27
DTC Logic ...............................................................27
Diagnosis Procedure ...............................................27
P1808 VEHICLE SPEED SENSOR (ABS) .........28
Description .......................................................... ....28
DTC Logic ............................................................ ....28
Diagnosis Procedure ...............................................28
P1810 NEUTRAL-4LO SWITCH .......................29
Description ...............................................................29
DTC Logic ................................................................29
Diagnosis Procedure ...............................................29
Component Inspection .............................................31
P1813 4WD SHIFT SWITCH .............................32
Description ...............................................................32
DTC Logic ................................................................32
Diagnosis Procedure ...............................................32
Component Inspection .............................................34
P1814 WAIT DETECTION SWITCH .................36
Description ...............................................................36
DTC Logic ................................................................36
Diagnosis Procedure ...............................................36
Component Inspection .............................................38
P1816 TRANSMISSION RANGE SWITCH .......39
Description ...............................................................39
DTC Logic ................................................................39
Diagnosis Procedure ...............................................39
P1817 ACTUATOR MOTOR .............................40
Description ...............................................................40
DTC Logic ................................................................40
Diagnosis Procedure ...............................................40
Component Inspection .............................................44
P1818 ACTUATOR POSITION SWITCH ..........46
Description ...............................................................46
DTC Logic ................................................................46
Diagnosis Procedure ...............................................46
Component Inspection .............................................48
P1819 TRANSFER CONTROL DEVICE ...........49
Description ...............................................................49
DTC Logic ................................................................49
Diagnosis Procedure ...........................................
....49
Revision: April 20092010 QX56

DLN-2
P1820 ENGINE SPEED SIGNAL ......................53
Description ........................................................... ...53
DTC Logic ...............................................................53
Diagnosis Procedure ..............................................53
P1822 CLUTCH PRESSURE SOLENOID .........54
Description ..............................................................54
DTC Logic ...............................................................54
Diagnosis Procedure ..............................................54
Component Inspection ............................................57
P1823 2-4 SOLENOID .......................................58
Description ........................................................... ...58
DTC Logic ...............................................................58
Diagnosis Procedure ..............................................58
Component Inspection ............................................61
P1824 TRANSFER MOTOR ..............................62
Description ..............................................................62
DTC Logic ...............................................................62
Diagnosis Procedure ..............................................62
Component Inspection ............................................66
P1826 TRANSFER FLUID TEMPERATURE ....68
Description ........................................................... ...68
DTC Logic ...............................................................68
Diagnosis Procedure ..............................................68
Component Inspection ............................................69
P1827 CLUTCH PRESSURE SWITCH .............71
Description ........................................................... ...71
DTC Logic ...............................................................71
Diagnosis Procedure ..............................................71
Component Inspection ............................................73
P1828 LINE PRESSURE SWITCH ....................74
Description ........................................................... ...74
DTC Logic ...............................................................74
Diagnosis Procedure ..............................................74
Component Inspection ............................................76
P1829 THROTTLE POSITION SIGNAL (ECM)
...
77
Description ........................................................... ...77
DTC Logic ...............................................................77
Diagnosis Procedure ..............................................77
P1830 ABS OPERATION SIGNAL (ABS) ........78
Description ........................................................... ...78
DTC Logic ...............................................................78
Diagnosis Procedure ..............................................78
P1831 VDC OPERATION SIGNAL (ABS) ........79
Description ........................................................... ...79
DTC Logic ...............................................................79
Diagnosis Procedure ..............................................79
P1832 TCS OPERATION SIGNAL (ABS) .........80
Description ........................................................... ...80
DTC Logic ...............................................................80
Diagnosis Procedure ..............................................80
ECU DIAGNOSIS .......................................81
TRANSFER CONTROL UNIT ...........................81
Reference Value .................................................. ...81
Wiring Diagram - ALL-MODE 4WD SYSTEM - .... ...89
DTC Index ............................................................ ...97
SYMPTOM DIAGNOSIS ...........................102
4WD SYSTEM SYMPTOMS ........................... ..102
Symptom Table .................................................... .102
4WD SHIFT INDICATOR LAMP AND 4LO IN-
DICATOR LAMP DO NOT TURN ON ..............
103
Description ............................................................103
Diagnosis Procedure .............................................103
4WD WARNING LAMP DOES NOT TURN ON ..105
Description ........................................................... .105
Diagnosis Procedure .............................................105
4WD SHIFT INDICATOR LAMP OR 4LO INDI-
CATOR LAMP DO NOT CHANGE ...................
107
Description ........................................................... .107
Diagnosis Procedure .............................................107
ATP WARNING LAMP DOES NOT TURN ON ..109
Description ........................................................... .109
Diagnosis Procedure .............................................109
4WD SHIFT INDICATOR LAMP KEEPS
FLASHING ........................................................
111
Description ........................................................... .111
Diagnosis Procedure .............................................111
4WD WARNING LAMP FLASHES RAPIDLY ..112
Description ............................................................112
Diagnosis Procedure .............................................112
4WD WARNING LAMP FLASHES SLOWLY ..113
Description ............................................................113
Diagnosis Procedure .............................................113
HEAVY TIGHT-CORNER BRAKING SYMP-
TOM OCCURS ................................................ ..
114
Description ........................................................... .114
Diagnosis Procedure .............................................114
ATP SWITCH ....................................................116
Description ........................................................... .116
Diagnosis Procedure .............................................116
4WD SYSTEM DOES NOT OPERATE ............118
Description ........................................................... .118
Diagnosis Procedure .............................................118
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING ...........................
119
NVH Troubleshooting Chart ..................................119
PRECAUTION ............... ............................120
Revision: April 20092010 QX56

DLN-10
< FUNCTION DIAGNOSIS >[ATX14B]
4WD SYSTEM
FUNCTION DIAGNOSIS
4WD SYSTEM
System DiagramINFOID:0000000005148770
COMPONENT DESCRIPTION
WDIA0164E
Components
Function
Transfer control unit Controls transfer control device, control valves and shifts between 2WD/4WD and 4H/4LO.
Transfer control device Integrates actuator motor and actuator position switch.
2-4WD shift solenoid valve Controls oil pressure and allows shifting between 2WD and 4WD.
Clutch pressure solenoid valve Controls oil pressure and distributes torque between front and rear tires.
Line pressure switch Detects line pressure.
Clutch pressure switch Detects clutch pressure.
Transfer fluid temperature sensor Detects transfer fluid temperature.
Actuator motor Moves shift rods when signaled by transfer control unit.
Actuator position switch Detects actuator motor position.
Wait detection switch Detects whether or not 4WD lock gear is locked.
4LO switch Detects if transfer case is in 4LO.
ATP switch Detects if transfer case is in neutral.
4WD shift switch Allows driver to select from 2WD/4WD, 4H/4LO and AUTO.
4WD warning lamp • Illuminates if malfunction is detected in 4WD system.
• Flashes (1 flash / 2 seconds) if large difference in diameter of front and rear tires.
• Flashes (2 flashes / 1 second) if high transfer fluid temperature is detected.
AT P w a r n i n g l a m p Indicates that A/T parking mechanism does not operate when A/T selector lever is in P position
because transfer case is in neutral.
4WD shift indicator lamp Displays driving range selected by 4WD shift switch.
4LO indicator lamp Displays 4LO range.
Revision: April 20092010 QX56

DLN-22
< COMPONENT DIAGNOSIS >[ATX14B]
P1811 POWER SUPPLY CIRCUIT
FOR TRANSFER CONTROL UNIT
COMPONENT DIAGNOSIS
P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT
DescriptionINFOID:0000000005148775
Power supply to transfer control unit is abnormally low while driving.
DTC LogicINFOID:0000000005148776
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1811 detected?
YES >> Perform diagnosis procedure. Refer to DLN-22, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000005148777
Regarding Wiring Diagram information, refer to DLN-89, "Wiring Diagram - ALL-MODE 4WD SYSTEM -".
1.CHECK POWER SUPPLY
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Connect transfer control unit harness connector.
3. Check voltage between transfer control unit harness connector terminals and ground.
4. Turn ignition switch ON. (Do not start engine.)
5. Check voltage between transfer control unit harness connector terminals and ground.
DTC CONSULT-III Diagnostic item is detected when... Reference
[ P 1 8 11 ] B AT T E R Y V O LTA G E Power supply voltage for transfer control
unit is abnormally low while driving.Refer to
DLN-22
.
Connector Terminal Voltage (Approx.)
E142 16 - Ground
0V
22 - Ground
E143 29 - Ground
30 - Ground
Battery voltage
47 - Ground
WDIA0165E
Connector Terminal Voltage (Approx.)
E142 16 - Ground
Battery voltage
22 - Ground
E143 29 - Ground
30 - Ground
0V
47 - Ground Battery voltage
WDIA0166E
Revision: April 20092010 QX56

P1810 NEUTRAL-4LO SWITCHDLN-29
< COMPONENT DIAGNOSIS > [ATX14B]
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P1810 NEUTRAL-4LO SWITCH
DescriptionINFOID:0000000005148788
The neutral-4LO switch detects that the transfer case is in neutral or 4LO range. DTC P1810 will set when an
improper signal from the neutral-4LO switch is input due to an open or short circuit.
DTC LogicINFOID:0000000005148789
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1810 displayed?
YES >> Perform diagnosis procedure. Refer to DLN-29, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000005148790
Regarding Wiring Diagram information, refer to DLN-89, "Wiring Diagram - ALL-MODE 4WD SYSTEM -".
1.CHECK 4LO POSITION SWITCH SIGNAL
With CONSULT-III1. Start engine.
2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT-III.
3. Read out the value of N POSI SW TF.
Without CONSULT-III
1. Start engine.
DTCCONSULT-III Diagnostic item is detected when... Reference
[P1810] 4L POSI SW TF Improper signal from neutral-4LO switch
is input due to open or short circuit.Refer to DLN-29
.
Condition
Display value
• Vehicle stopped
• Engine running
• A/T selector lever N position
• Brake pedal depressed 4WD shift switch: 2WD,
AUTO or 4H
OFF
4WD shift switch: 4H to
4LO (While actuator mo-
tor is operating.) OFF
→ ON
4WD shift switch: 4LO to
4H (While actuator motor
is operating.) ON
→ OFF
4WD shift switch: 4LO ON
Revision: April 20092010 QX56

DLN-32
< COMPONENT DIAGNOSIS >[ATX14B]
P1813 4WD SHIFT SWITCH
P1813 4WD SHIFT SWITCH
DescriptionINFOID:0000000005148792
The 4WD shift switch allows the driver to select
AUTO, 2WD or 4WD and 4H or 4LO. DTC P1813 will set if
more than two switch inputs are simultaneously detected by the transfer control unit due to a short circuit in the
4WD shift switch.
DTC LogicINFOID:0000000005148793
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1813 displayed?
YES >> Perform diagnosis procedure. Refer to DLN-32, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000005148794
Regarding Wiring Diagram information, refer to DLN-89, "Wiring Diagram - ALL-MODE 4WD SYSTEM -".
1.CHECK 4WD SHIFT SWITCH SIGNAL
With CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT-III.
3. Read out ON/OFF switching action of the 2WD SWITCH, AUTO SWITCH, LO CK SWITCH, 4L SW with
operating 4WD shift switch.
Without CONSULT-III1. Turn ignition switch ON. (Do not start engine.)
2. Check voltage between transfer control unit harness connector terminals and ground.
DTC CONSULT-III Diagnostic item is detected when... Reference
[P1813] 4WD MODE SW More than two switch inputs are simulta-
neously detected due to short circuit of
4WD shift switch.Refer to
DLN-32
.
Connector Terminal ConditionVoltage (Ap-
prox.)
E142 9 - ground
4WD shift switch: 2WD
Battery voltage
4WD shift switch: AUTO, 4H or 4LO 0V
18 - ground 4WD shift switch: 4H
Battery voltage
4WD shift switch: 2WD, AUTO or
4LO 0V
23 - ground 4WD shift switch: 4LO
Battery voltage
4WD shift switch: 2WD, AUTO or 4H 0V
24 - ground 4WD shift switch: AUTO
Battery voltage
4WD shift switch: 2WD, 4H or 4LO 0V
WDIA0148E
Revision: April 20092010 QX56

DLN-36
< COMPONENT DIAGNOSIS >[ATX14B]
P1814 WAIT DETECTION SWITCH
P1814 WAIT DETECTION SWITCH
DescriptionINFOID:0000000005148796
The wait detection switch detects if the transfer case
is in 4WD. DTC P1814 will set if an improper signal from
the wait detection switch is input due to open or short circuit.
DTC LogicINFOID:0000000005148797
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1814 detected?
YES >> Perform diagnosis procedure. Refer to DLN-36, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000005148798
Regarding Wiring Diagram information, refer to DLN-89, "Wiring Diagram - ALL-MODE 4WD SYSTEM -".
1.CHECK WAIT DETECTION SWITCH SIGNAL
With CONSULT-III
1. Start engine.
2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT-III.
3. Read out the value of WAIT DETCT SW.
Without CONSULT-III
1. Start engine.
DTCCONSULT-III Diagnostic item is detected when... Reference
[P1814] 4WD DETECT SWITCH Improper signal from wait detection
switch is input due to open or short cir-
cuit.
Refer to
DLN-36
.
Condition Display value
• Vehicle stopped
• Engine running
• A/T selector lever N position
• Brake pedal depressed 4WD shift switch: 2WD, AUTO
or 4H
OFF
4WD shift switch: 4H to 4LO
(While actuator motor is operat-
ing.) OFF
→ ON
4WD shift switch: 4LO to 4H
(While actuator motor is operat-
ing.) ON
→ OFF
4WD shift switch: 4LO ON
Revision: April 20092010 QX56