clutch INFINITI QX56 2011 Factory User Guide

DLK-34
< SYSTEM DESCRIPTION >
SYSTEM (AUTOMATIC BACK DOOR SYSTEM)
TIME CHART FOR AUTOMATIC POWER BACK DOOR SYSTEM
Fully Closed to Fully Open Operation
When operating the automatic back door switch, automatic back door opener switch and Intelligent Key in the
fully closed position, the system operates as follows.
Vehicle speed
(0 km/h → More than 0 km/h) Open operation
Operation stop and intermittent clutch function [Back
door fully closed or buzzer sounds until the vehicle
stops (pattern C)]
Close operation The operation is continued [buzzer sounds (pattern C)
until back door fully closed]
Touch sensor
(Normal → Open) Open operation
The operation is continued (If the pinch is detected af-
ter that, the system switches to the intermittent clutch
function)
Close operation Intermittent clutch function
Closure (close) opera-
tion Closure (open) operation and buzzer sounds (pattern
B)
Closure [open (return
the latch to the neutral
position)] The operation is continued
Operation time
(More than approx. 30 sec.) Intermittent clutch function
Back door opener switch
(OFF → ON) Open/close operation The operation is continued
Closure (close) opera-
tion
Closure (open) operation and back door open
Closure [open (return
the latch to the neutral
position)] Back door open
Malfunction detected
(IGN circuit, half latch switch and back door
state) Intermittent clutch function
Item
(Condition) Back door condition
Revision: 2010 May2011 QX56

SYSTEM (AUTOMATIC BACK DOOR SYSTEM)
DLK-35
< SYSTEM DESCRIPTION >
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1. Operates the buzzer and hazard after the operation enable conditions are established
2. The back door closure motor performs the open operat ion after the buzzer (pattern A) stops sounding
3. Stops the back door closure motor open operation after turning the open switch to ON Then, operate the automatic back door motor and clutch to perform the back door open operation
4. The back door closure motor performs the close operation after turning the half latch switch to ON
5. Stop the back door closure motor close operation and return the latch to the neutral position after turning the close switch to OFF
NOTE:
In the operation of steps 3 and 4, the inputs of half la tch switch, open switch, and close switch may be different
according to the reaction force of the back door weather-strip. Refer to the area encircled by a broken line in
the Time chart (Fully closed to fully open operation)
Fully Open to Fully Closed Operation
When operating the automatic back door switch, automatic back door close switch and Intelligent Key, the
automatic back door system operates as follows.
JMKIA5203GB
Revision: 2010 May2011 QX56

DLK-36
< SYSTEM DESCRIPTION >
SYSTEM (AUTOMATIC BACK DOOR SYSTEM)
1. Operates the buzzer and hazard after the operation enable conditions are established
2. After the buzzer (pattern A) stops sounding, operates the automatic back door motor and clutch to perform
the back door close operation
3. The back door closure motor performs the close operat ion after 300 msec. or more from turning the half
latch switch to OFF
4. The back door closure motor performs the open operation after turning the close switch to ON
5. Stop the back door closure motor open operation and return the latch to the neutral position after turning
the close switch to OFF
JMKIA5204GB
Revision: 2010 May2011 QX56

DLK-42
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (BCM)
SELF-DIAG RESULT
Refer to BCS-57, "DTCIndex".
DATA MONITOR
AUTO LOCK SET Auto door lock operation time can be changed in this mode
 MODE 1: OFF
 MODE 2: 30 sec
 MODE 3: 1 minute
 MODE 4: 2 minutes
 MODE 5: 3 minutes
 MODE 6: 4 minutes
 MODE 7: 5 minutes
HORN WITH KEYLESS LOCK Horn reminder function mode by Intelligent Key button can be selected from the following with
this mode
 On: Operate
 Off: Non-operation
PW DOWN SET Unlock button pressing time on Intelligent Key button can be selected from the following with
this mode
 MODE 1: 3 sec
 MODE 2: Non-operation
 MODE 3: 5 sec
WELCOME LIGHT SELECT Welcome light function mode can be selected from the following with this mode
 Puddle/Outside Handle
 Room lamp
 Head & Tail Lamps (this item is displayed, but cannot be used)
 Heart Beat
WELCOME LIGHT OP SET Welcome light function mode can be changed to operation with this mode
 On: Operate
 Off: Non-operation
Monitor item Description
Monitor Item Condition
REQ SW -DR Indicates [On/Off] condition of door request switch (driver side)
REQ SW -AS Indicates [On/Off] condition of door request switch (passenger side)
REQ SW -BD/TR Indicates [On/Off] condition of back door request switch
PUSH SW Indicates [On/Off] condition of push-button ignition switch
CLUTCH SW NOTE:
This item is displayed, but cannot be monitored
BRAKE SW 1 Indicates [On/Off]* condition of stop lamp switch power supply
BRAKE SW 2 Indicates [On/Off] condition of stop lamp switch
DETE/CANCL SW Indicates [On/Off] condition of P position
SFT PN/N SW Indicates [On/Off] condition of P or N position
S/L -LOCK Indicates [On/Off] condition of steering lock unit (LOCK)
S/L -UNLOCK Indicates [On/Off] condition of steering lock unit (UNLOCK)
S/L RELAY -F/B Indicates [On/Off] condition of steering lock relay
UNLK SEN -DR Indicates [On/Off] condition of driver door UNLOCK status
PUSH SW -IPDM Indicates [On/Off] condition of push-button ignition switch
IGN RLY1 -F/B Indicates [On/Off] condition of ignition relay 1
DETE SW -IPDM Indicates [On/Off] condition of P position
SFT PN -IPDM Indicates [On/Off] condition of P or N position
SFT P -MET Indicates [On/Off] condition of P position
SFT N -MET Indicates [On/Off] condition of N position
ENGINE STATE Indicates [Stop/Stall/Crank/Run] condition of engine states
Revision: 2010 May2011 QX56

AUTOMATIC BACK DOOR CONTROL MODULEDLK-49
< ECU DIAGNOSIS INFORMATION >
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Fail SafeINFOID:0000000006225861
DTC Inspection Priority ChartINFOID:0000000006225862
If some DTCs are displayed at the same time, per form inspections one by one based on the following priority
chart.
16
(LG) Ground
Touch sensor RH sig-
nal Input Touch sensor RH Detect obstruc-
tion
0 V
Other than above 6 V
17
(O) Ground Automatic back door
main switch
InputAutomatic back
door main switch ON Battery voltage
OFF 0 V
19
(L/Y) Ground Close switch signal Input Back door Fully closed 0 V
Open/half latch Battery voltage
20
(G/Y) Ground Open switch signal Input Back door Open 0 V
Half latch/fully
closed
Battery voltage
22
(B) Ground Ground (destination) — — 0 V
23
(B) Ground
Ground (Hazard re-
minder) —— 0 V
28
(R/W) Ground Power supply (BAT) Input — Battery voltage
34
(B) Ground Ground — — 0 V
Te r m i n a l N o .
(Wire color) Description
Condition Vo l ta g e
(Approx.)
(+) (–) Signal name Input/
Output
Display contents of CONSUL T-III Fail-safe Cancellation
B2401 IGN OPEN Intermittent clutch function All following condition are satisfied
 Power supply condition of auto-
matic back door control unit: OFF
 BCM receive ignition position sig- nal (OFF) via CAN
B2403 PULSE ENCODER Inhibit automatic back door operation When receiving the pulse from en-
coders A and B normally (5 pulses)
B2409 HALF LATCH SW Intermittent clutch function Half latch switch is ON from OFF
B2416 TOUCH SEN R OPEN During close operation: Intermittent clutch
function
Normal return
B2417 TOUCH SEN L OPEN During close operation: Intermittent clutch
function Normal return
B2419 OPEN SW Inhibit automatic back door operation Erase DTC, reconnect battery
B2420 CLOSE SW Inhibit automatic back door operation Erase DTC, reconnect battery
B2421 CLUTCH TIME OUT Intermittent clutch function Reception of next operation request
B2422 BACK DOOR STATE Intermittent clutch function Detect back door fully closed posi-
tion
B2423 ABD MTR TIME OUT Intermittent clutch function Reception of next operation request
B2424 CLSR CONDITION Inhibit automatic back door operation Normal return or reconnect battery
Revision: 2010 May2011 QX56

DLK-50
< ECU DIAGNOSIS INFORMATION >
AUTOMATIC BACK DOOR CONTROL MODULE
DTC Index
INFOID:0000000006225863
NOTE: Details of time display
 1 - 39: Displayed if any previous malfunction is present when current condition is normal. It increases like 1
→ 2 → 3...38 → 39 after returning to the normal condition whenever ignition switch OFF → ON. The counter
remains at 39 even if the number of cycles exceeds it . It is counted from 1 again when turning ignition switch
OFF → ON after returning to the normal condition if the malfunction is detected again.
Priority DTC
1  B2425 AUTO BK DR CNT UNIT
 U1000: CAN COMM
 U1010: CONTROL UNIT (CAN)
 B2401 IGN OPEN
2  B2403 PULSE ENCODER
 B2409 HALF LATCH SW
 B2416 TOUCH SEN R OPEN
 B2417 TOUCH SEN L OPEN
 B2419 OPEN SW
 B2420 CLOSE SW
 B2421 CLUTCH TIME OUT
 B2422 BACK DOOR STATE
 B2423 ABD MTR TIME OUT
 B2424 CLSR CONDITION
CONSULT-III display Fail-safe Item Reference page
U1000: CAN COMM — CAN communication circuit DLK-82
U1010: CONTROL UNIT(CAN) — Internal CAN communication circuitDLK-83
B2401: IGN OPEN×IGN power supply circuit DLK-84
B2403: PULSE ENCODER×Encoder signal DLK-85
B2409: HALF LATCH SW×Half latch switch signal DLK-86
B2416: TOUCH SEN R OPEN×Touch sensor RH DLK-88
B2417: TOUCH SEN L OPEN×Touch sensor LH DLK-90
B2419: OPEN SW×Open switch signal DLK-92
B2420: CLOSE SW×Close switch signal DLK-95
B2421: CLUTCH TIME OUT×Clutch operation time DLK-97
B2422: BACK DOOR STATE×Back door state DLK-98
B2423: ABD MTR TIME OUT×Automatic back door motor operation time DLK-99
B2424: CLSR CONDITION×Closure condition DLK-100
B2425: AUTO BCK DR CNT UNIT — Automatic back door control unit DLK-103
Revision: 2010 May2011 QX56

B2421 CLUTCH OPERATION TIMEDLK-97
< DTC/CIRCUIT DIAGNOSIS >
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B2421 CLUTCH OPERATION TIME
DTC LogicINFOID:0000000006225897
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self Diagnostic Result” mode of “AUTOMAT IC BACK DOOR CONTROL UNIT” using CONSULT-
III.
Is DTC detected?
YES >> Refer to DLK-97, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225898
1.CHECK AUTOMATIC BACK DOOR CONTROL MODULE POWER SUPPLY AND GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check automatic back door control module power supply and ground circuit. Refer to DLK-116, "
AUTOMATIC BACK DOOR CONTROL UNIT : Diagnosis Procedure".
Is the inspection result normal?
YES >> Replace automatic back door control module. Refer to DLK-262, "Removal and Installation".
NO >> Repair or replace the malfunctioning parts.
DTC CONSULT-III display
description DTC detecting condition Possible cause
B2421 CLUTCH TIME OUT When the automatic back door control unit detects
the power distribution to the clutch for 2 minutes or
more  Automatic back door control mod-
ule
 Battery voltage (low voltage)
Revision: 2010 May2011 QX56

STRUCTURE AND OPERATIONDLN-13
< SYSTEM DESCRIPTION > [TRANSFER: ATX90A]
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STRUCTURE AND OPERATION
Sectional ViewINFOID:0000000006222222
Torque Split MechanismINFOID:0000000006222223
CONTROL DIAGRAM
1. Rear companion flange 2. Main shaft 3. Rear case
4. Ball ramp lever 5. Ball lamp lever 6. Piston
7. Clutch 8. Sprocket 9. Lock sleeve
10. Hi-Lo sleeve 11. Sun gear 12. Front case
13. Planetary carrier assembly 14. Internal gear 15. Shift fork
16. Transfer rotary position sensor 17. Front shaft flange 18. Drive chain
19. Actuator shaft 20. Cam 21. Transfer control actuator
JPDIE0277ZZ
Revision: 2010 May2011 QX56

DLN-14
< SYSTEM DESCRIPTION >[TRANSFER: ATX90A]
STRUCTURE AND OPERATION
DESCRIPTION
 Ball ramp lever operates in the direction of main shaft axis according to rotation of actuator shaft and
presses piston. Pressure is applied to each clutch and torque is transmitted.
 Shift fork operates in the direction of main shaft axis according to rotation of actuator shaft and performs
engagement and disengagement to Hi-Lo sleeve and lock sleev e of main shaft. Mode is switched between
4H ⇔4L.
AUTO MODE
 The optimum torque distribution is electronically performed for front and rear wheels according to road con-
ditions.
 Stable start without wheel spin is possible on slippery road conditions, such as on a snowy road.
 When road condition does not require 4WD driving, the st atus becomes close to rear wheel drive, which
results in better fuel efficiency and prov ides FR-like steering characteristics.
 The vehicle cornering status is judged according to information from each sensor, and the optimum torque is
distributed to front wheels for prev enting tight-corner braking symptom.
NOTE:
When there is a difference of revolution speed between the front and rear wheel the shift occasionally changes
to direct 4-wheel driving conditions aut omatically. This is not a malfunction.
4H MODE
 Torque distribution for front and rear wheels is fixed and stable start is achieved while driving on an rough,
sandy or snowy road.
4L MODE
 Large traction force is obtained due to low gear. High running ability and escaping ability are achieved.
 Switching from 4H mode to 4L mode is not possible w hen the vehicle is not stopped and A/T shift selector is
not in the neutral position.
TORQUE DISTRIBUTION DIAGRAM
JPDIE0256GB
Revision: 2010 May2011 QX56

STRUCTURE AND OPERATIONDLN-15
< SYSTEM DESCRIPTION > [TRANSFER: ATX90A]
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TORQUE DISTRIBUTION FLOW
OPERATION PRINCIPLE
AUTO, 4H MODE
1. Main shaft 2. Clutch 3. Sprocket
4. Lock sleeve 5. Hi-Lo sleeve 6. Sun gear
7. Planetary carrier assembly 8. Front shaft flange 9. Drive chain
JPDIE0271GB
JPDIE0257GB
Revision: 2010 May2011 QX56