Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti QX56 JA60 2004-2005 Approved 2004_QX56 tf
<< Back | HomeMost service manuals and schematics are PDF files, so You will need Adobre Acrobat Reader to view : Acrobat Download Some of the files are DjVu format. Readers and resources available here : DjVu Resources
For the compressed files, most common are zip and rar. Please, extract files with Your favorite compression software ( WinZip, WinRAR ... ) before viewing. If a document has multiple parts, You should download all, before extracting.
Good luck. Repair on Your own risk. Make sure You know what You are doing.
Image preview - the first page of the document
>> Download tf documenatation <<
Text preview - extract from the document
D DRIVELINE/AXLE
A
SECTION TF
TRANSFER
B
C
TF
E
CONTENTS
PREPARATION .......................................................... 4 . CONSULT-II Function (ALL MODE AWD/4WD) .... 31 . F
Special Service Tools .............................................. 4 . Trouble Diagnosis with CONSULT-II ..................... 31 .
Commercial Service Tools ....................................... 7 . SELF-DIAGNOSIS ............................................. 31 .
PRECAUTIONS ......................................................... 8 . SELF-DIAGNOSTIC ITEMS ............................... 32 . G
Precautions for Supplemental Restraint System DATA MONITOR ................................................ 34 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- DATA MONITOR ITEMS .................................... 35 .
SIONER" ................................................................. 8
. REFERENCE VALUE IN DATA MONITOR MODE
H
Precautions ............................................................. 8
. ... 38
Service Notice ......................................................... 9
. WORK SUPPORT .............................................. 41 .
Wiring Diagrams and Trouble Diagnosis ................. 9 . CLUTCH FORCE RELEASE LIMIT ADJUST-
ALL-MODE 4WD SYSTEM ..................................... 10 . MENT ................................................................. 42
. I
Cross-sectional View ............................................. 10 . TROUBLE DIAGNOSIS -- INTRODUCTION .......... 44 .
Control System .......................................................11 . Introduction ............................................................ 44
.
ALL-MODE 4WD TRANSFER BASIC CONTROL DESCRIPTION ................................................... 44 . J
... 12 DIAGNOSTIC WORKSHEET ............................. 44 .
HYDRAULIC CONTROL CIRCUITS .................. 12 . Work Flow .............................................................. 46
.
OUTLINE ............................................................ 12. HOW TO PERFORM TROUBLE DIAGNOSES
K
CONTROL SYSTEM DIAGRAM ........................ 13 . FOR QUICK AND ACCURATE REPAIR ............ 46 .
INDICATIONS OF 4WD WARNING LAMP ........ 13 . TROUBLE DIAGNOSIS -- BASIC INSPECTION ... 47
CAN Communication ............................................. 13 . Listen to Customer Complaints ............................. 47 .
SYSTEM DESCRIPTION ................................... 13 . Transfer Fluid Check ............................................. 47 . L
Location of Electrical Parts .................................... 14 . Road Test .............................................................. 47
.
Description of Electrical Parts ............................... 15 . PREPARATION FOR ROAD TEST .................... 47 .
TRANSFER MOTOR ......................................... 15 . 1. CHECK BEFORE ENGINE IS STARTED ...... 48 . M
WAIT DETECTION SWITCH ............................. 15 . 2. CHECK AT IDLE ............................................. 49 .
2-4WD SHIFT SOLENOID VALVE ..................... 15 . 3. CRUISE TEST ................................................ 53 .
LINE PRESSURE SWITCH ............................... 16 . TROUBLE DIAGNOSIS -- GENERAL DESCRIP-
Circuit Diagram for Quick Pinpoint Check ............. 17 . TION ......................................................................... 55
.
Wiring Diagram -- T/F -- ...................................... 18 . Transfer Control Unit Terminals and Reference
ON BOARD DIAGNOSTIC SYSTEM DESCRIP- Value ...................................................................... 55
.
TION ......................................................................... 27
. TRANSFER CONTROL UNIT HARNESS CON-
Trouble Diagnosis without CONSULT-II ................ 27 . NECTOR LAYOUT ............................................. 55 .
DESCRIPTION ................................................... 27 . TRANSFER CONTROL UNIT INSPECTION
SELF-DIAGNOSTIC PROCEDURE ................... 28 . TABLE ................................................................ 55
.
INDICATIONS OF 4WD WARNING LAMP ........ 28 . DTC U1000, U1001 CAN COMMUNICATION LINE 59 ...
CAN Communication System Inspection ............... 59 .
4WD SOLENOID VALVE ......................................... 60 .
Diagnostic Procedure ............................................ 60 .
2-4WD SHIFT SOLENOID VALVE AND 4WD SHIFT
Revision: August 2007 TF-1 2004 QX56
SWITCH .................................................................... 62. SWITCH AND LINE PRESSURE SWITCH ........95 .
Diagnostic Procedure ............................................ 62 . TRANSFER DROPPING RESISTOR .................96 .
TRANSFER MOTOR AND TRANSFER MOTOR ATP SWITCH, NEUTRAL-4LO SWITCH AND
RELAY ...................................................................... 64
. WAIT DETECTION SWITCH ..............................96 .
Diagnostic Procedure ............................................ 64 . TRANSFER MOTOR ..........................................96 .
TRANSFER FLUID TEMPERATURE SENSOR ...... 66 . TRANSFER MOTOR RELAY ..............................97 .
Diagnostic Procedure ............................................ 66 . TRANSFER SHIFT RELAY (HIGH & LOW) ........97 .
ATP SWITCH, WAIT DETECTION SWITCH AND ACTUATOR AND ACTUATOR POSITION
NEUTRAL-4LO SWITCH ......................................... 69 . SWITCH ..............................................................97
.
Diagnostic Procedure ............................................ 69 . TRANSFER CONTROL UNIT ..................................98 .
CLUTCH PRESSURE SWITCH ............................... 72 . Removal and Installation ........................................98 .
Diagnostic Procedure ............................................ 72 . REMOVAL ...........................................................98 .
LINE PRESSURE SWITCH ...................................... 74 . INSTALLATION ...................................................98 .
Diagnostic Procedure ............................................ 74 . FRONT OIL SEAL ....................................................99 .
DATA ERASE/DISPLAY ........................................... 76 . Removal and Installation ........................................99 .
Diagnostic Procedure ............................................ 76 . REMOVAL ...........................................................99 .
SHIFT ACTUATOR .................................................. 77 . INSTALLATION ................................................. 100 .
Diagnostic Procedure ............................................ 77 . REAR OIL SEAL .................................................... 101 .
SHIFT ACTUATOR POSITION SWITCH ................. 80 . Removal and Installation ...................................... 101 .
Diagnostic Procedure ............................................ 80 . REMOVAL ......................................................... 101 .
SHIFT ACTUATOR CIRCUIT ................................... 82 . INSTALLATION ................................................. 101 .
Diagnostic Procedure ............................................ 82 . SIDE OIL SEAL ...................................................... 103 .
TROUBLE DIAGNOSES FOR SYMPTOMS ............ 85 . Removal and Installation ...................................... 103 .
Symptom 1. 4WD Shift Indicator Lamp Does Not REMOVAL ......................................................... 103 .
Turn ON (Although the ignition switch is turned ON, INSTALLATION ................................................. 103 .
all the 4WD indicator lamps do not turn ON for 1 TRANSFER CONTROL DEVICE ........................... 104 .
second) .................................................................. 85
. Removal and Installation ...................................... 104 .
Symptom 2. 4WD Warning Lamp Does Not Turn ON AIR BREATHER HOSE .......................................... 105 .
(Although the ignition switch is turned ON, the 4WD Removal and Installation ...................................... 105 .
warning lamp does not turn ON) ............................ 87 . TRANSFER MOTOR .............................................. 106 .
Symptom 3. 4WD Shift Indicator Lamp Does Not Removal and Installation ...................................... 106 .
Turn OFF (When 4WD shift switch is set from 4H REMOVAL ......................................................... 106 .
to 4LO, all the 4WD shift indicator lamps do not turn INSTALLATION .................................................... 106 .
off) .......................................................................... 88
. TRANSFER OIL FILTER ........................................ 107 .
Symptom 4. ATP Warning Lamp Does Not Turn ON Removal and Installation ...................................... 107 .
(When 4WD shift switch is set from 4H to 4LO with REMOVAL ......................................................... 107 .
the A/T selector lever in P position, the ATP warning INSTALLATION ................................................. 107 .
lamp does not turn on) ........................................... 89 . REMOVAL AND INSTALLATION ........................... 109 .
Symptom 5. 4LO Indicator Lamp Does Not Turn ON Removal ............................................................... 109
.
(When 4WD shift switch is set from 4H to 4LO posi- Installation ............................................................ 109
.
tion, 4LO indicator lamp does not turn ON) ........... 90 . OVERHAUL ............................................................ 110 .
Symptom 6. 4WD Shift Indicator Lamp Does Not Transfer Components .......................................... 110 .
Indicate "LOCK" (When 4WD shift switch is set to REAR CASE ........................................................... 112 .
"4H", 4WD shift indicator lamp does not indicate Disassembly ......................................................... 112
.
"LOCK") ................................................................. 91. CENTER CASE ...................................................... 113 .
Symptom 7. 4WD Shift Indicator Lamp Repeats Disassembly ......................................................... 113
.
Flickering (4WD Shift Indicator Lamp Keeps Flick- FRONT DRIVE SHAFT AND DRIVE CHAIN .... 115 .
ering) ..................................................................... 92
. MAINSHAFT AND CLUTCH DRUM ................. 116 .
Symptom 8. Tight Corner Braking Symptom (Tight CLUTCH PISTON ............................................. 118 .
Corner Braking Symptom Occurs-Hydraulic Sys- CONTROL VALVE ............................................ 119 .
tem Failure) ........................................................... 93 . MAINSHAFT REAR BEARING ......................... 122 .
Symptom 9. 4WD System Does Not Operate (The MAIN OIL PUMP ............................................... 122 .
Vehicle Cannot Be Put Into 4WD Mode-Hydraulic SUB OIL PUMP ................................................ 123 .
System Failure) ..................................................... 94 . OIL FILTER ....................................................... 124.
Component Inspection ........................................... 95 . FRONT CASE ......................................................... 125 .
4WD SHIFT SWITCH ......................................... 95 . Disassembly ......................................................... 125
.
2-4WD SHIFT SOLENOID VALVE AND TRANS- SHIFT ROD COMPONENTS ............................ 125 .
FER FLUID TEMPERATURE SENSOR ............. 95 . PLANETARY CARRIER, SUN GEAR AND
4WD SOLENOID VALVE, CLUTCH PRESSURE INTERNAL GEAR ............................................. 127 .
Revision: August 2007 TF-2 2004 QX56
FRONT CASE ........................................................ 131. CENTER CASE ...................................................... 140.
Inspection ............................................................ 131
. Assembly ............................................................. 140
. A
PLANETARY CARRIER ................................... 131 . OIL FILTER ....................................................... 140
.
SUN GEAR ...................................................... 131 . SUB OIL PUMP ................................................ 140 .
INTERNAL GEAR ............................................ 131 . MAIN OIL PUMP .............................................. 141 . B
SHIFT ROD COMPONENTS ........................... 131 . CONTROL VALVE ............................................ 142 .
CENTER CASE ..................................................... 133 . CLUTCH PISTON ............................................. 144 .
Inspection ............................................................ 133
. MAINSHAFT AND CLUTCH DRUM ................. 145 .
BEARINGS ....................................................... 133. FRONT DRIVE SHAFT AND DRIVE CHAIN .... 148 . C
SUB-OIL PUMP ............................................... 133 . ASSEMBLY ............................................................ 149
.
MAIN OIL PUMP .............................................. 133 . Final Assembly .................................................... 149
.
MAINSHAFT .................................................... 133 . SERVICE DATA AND SPECIFICATIONS (SDS) ... 153 . TF
CONTROL VALVE ........................................... 134 . General Specifications ......................................... 153 .
CLUTCH ........................................................... 134
. Inspection and Adjustment .................................. 153 .
FRONT CASE ........................................................ 136. CLEARANCE BETWEEN INNER GEAR AND E
Assembly ............................................................. 136
. OUTER GEAR .................................................. 153 .
PLANETARY CARRIER, SUN GEAR AND CLUTCH ........................................................... 153
.
INTERNAL GEAR ............................................ 136 . PINION GEAR END PLAY ............................... 153 .
SHIFT ROD ASSEMBLY .................................. 139 . CLEARANCE BETWEEN SHIFT FORK AND F
SLEEVE ........................................................... 153
.
SELECTIVE PARTS ......................................... 153 .
G
H
I
J
K
L
M
Revision: August 2007 TF-3 2004 QX56
PREPARATION
PREPARATION PFP:00002
Special Service Tools EDS0017H
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number Description
(Kent-Moore No.)
Tool name
ST30021000 Removing carrier bearing
( -- ) a: 110 mm (4.33 in) dia.
Puller b: 68 mm (2.68 in) dia.
NT411
ST30031000 Removing front drive shaft bearing
( -- ) a: 90 mm (3.54 in) dia.
Puller b: 50 mm (1.97 in) dia.
NT411
ST30720000 Installing mainshaft front bearing and oil seal
(J-25405) a: 77 mm (3.03 in) dia.
Drift b: 55.5 mm (2.185 in) dia.
NT658
ST33220000 Installation needle bearings
( -- ) a: 37 mm (1.46 in) dia.
Drift b: 31 mm (1.22 in) dia.
c: 22 mm (0.87 in) dia.
ZZA1046D
KV40100621 Installing front drive shaft front and rear bear-
(J-25273) ing
Drift a: 76 mm (2.99 in) dia.
b: 69 mm (2.72 in) dia.
NT086
ST30032000 Installing front drive shaft bearing
(J-26010-01) a: 38 mm (1.50 in) dia.
Base b: 80 mm (3.15 in) dia.
NT660
ST33052000 Removing front drive shaft bearing
( -- ) a: 28 mm (1.10 in) dia.
Adapter b: 22 mm (0.87 in) dia.
NT431
Revision: August 2007 TF-4 2004 QX56
PREPARATION
Tool number Description
(Kent-Moore No.) A
Tool name
ST33200000 Removing mainshaft front bearing
(J-26082) Installing planetary carrier assembly B
Support ring Installing oil seal
a: 74.5 mm (2.933 in) dia.
b: 62.5 mm (2.461 in) dia.
C
NT661
ST3532500 Removing metal bushing TF
( -- ) a: 215 mm (8.46 in)
Remover b: 25 mm (0.98 in) dia.
c: M 12 x P=1.5
E
NT663
KV38100500 Installing front oil seal F
( -- ) a: 80 mm (3.15 in) dia.
Drift b: 60 mm (2.36 in) dia.
G
NT115 H
ST30911000
( -- ) Removing and installing press flange snap
Puller ring
I
Installing carrier bearing
Installing mainshaft center case
a: 98 mm (3.86 in) dia.
b: 40.5 mm (1.594 in) dia. J
NT664
ST33290001 Removing metal bushing and oil seal
(J-34286)
Outer race puller K
L
NT665
ST22452000 Removing and installing press flange snap
(J-34335) ring M
Drift a: 45 mm (1.77 in) dia.
b: 36 mm (1.42 in) dia.
c: 400 mm (15.76 in) dia.
NT117
KV38100300 Removing mainshaft rear bearing
(J-25523) a: 54 mm(2.13 in) dia.
Drift b: 46 mm (1.81 in) dia.
c: 32 mm (1.26 in) dia.
ZZA1046D
Revision: August 2007 TF-5 2004 QX56
PREPARATION
Tool number Description
(Kent-Moore No.)
Tool name
ST35300000 Removing sun gear assembly
( -- ) Removing carrier bearing
Drift Installing metal bushing
a: 59 mm (2.32 in) dia.
b: 45 mm (1.77 in) dia.
NT073
ST33710000 Removing needle bearing
( -- ) Removing metal bushing
Drift a: 89 mm (3.5 in)
b: 30 mm (1.18 in) dia.
c: 24 mm (0.9 in) dia.
ZZA1057D
ST22360002 Installing oil seal
(J-25679-01) a: 23 mm (0.91 in) dia.
Drift b: 32 mm (1.26 in) dia.
ZZA1091D
ST15310000 Installing mainshaft rear bearing
(J-25640-B) a: 96 mm (3.78 in) dia.
Drift b: 84 mm (3.31 in) dia.
ZZA0908D
KV40105310 Installing dust cover
( -- ) Installing carrier bearing
Support ring a: 89.1 mm (3.508 in) dia.
b: 80.7 mm (3.177 in) dia.
NT661
KV31103300 Removing and installing press flange snap
( -- ) ring
Drift a: 76.3 mm (3.004 in) dia.
b: 130 mm (5.12 in)
NT668
Revision: August 2007 TF-6 2004 QX56
PREPARATION
Commercial Service Tools EDS0017I
A
Tool name Description
Flange wrench Removing and installing companion flange
B
C
NT771
Puller Removing companion flange
TF
E
NT077
Pin punch Removing and installing retainer pin F
a: 6 mm (0.24 in) dia.
G
NT410
H
Power tool Removing transfer case assembly
I
J
PBIC0190E
K
L
M
Revision: August 2007 TF-7 2004 QX56
PRECAUTIONS
PRECAUTIONS PFP:00001
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EDS0017J
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:
G To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.
G Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
G Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions EDS0017K
G Before connecting or disconnecting the transfer control
unit harness connector, turn ignition switch OFF and dis-
connect negative battery terminal. Failure to do so may
damage the transfer control unit. Because battery voltage is
applied to transfer control unit even if ignition switch is
turned off.
SEF289H
G When connecting or disconnecting pin connectors into or
from transfer control unit, take care not to damage pin ter-
minals (bend or break).
Make sure that there are not any bends or breaks on trans-
fer control unit pin terminal, when connecting pin connec-
tors.
SEF291H
G Before replacing transfer control unit, perform transfer con-
trol unit input/output signal inspection and make sure
whether transfer control unit functions properly or not. (See
page TF-55 .)
MEF040DB
Revision: August 2007 TF-8 2004 QX56
PRECAUTIONS
Service Notice EDS0017L
A
1. Before proceeding with disassembly, thoroughly clean the outside of the all-mode 4WD transfer. It is
important to prevent the internal parts from becoming contaminated by dirt or other foreign matter.
2. Disassembly should be done in a clean work area.
B
3. Use lint-free cloth or towels for wiping parts clean. Common shop rags can leave fibers that could interfere
with the operation of the all-mode 4WD transfer.
4. Place disassembled parts in order for easier and proper assembly.
C
5. All parts should be carefully cleaned with a general purpose, non-flammable solvent before inspection or
reassembly.
6. Gaskets, seals and O-rings should be replaced any time the all-mode 4WD transfer is disassembled.
TF
7. It is very important to perform functional tests whenever they are indicated.
8. The valve body contains precision parts and requires extreme care when parts are removed and serviced.
Place removed parts in a parts rack in order to replace them in correct positions and sequences. Care will
E
also prevent springs and small parts from becoming scattered or lost.
9. Properly installed valves, sleeves, plugs, etc. will slide along bores in valve body under their own weight.
10. Before assembly, apply a coat of recommended ATF to all parts. Apply petroleum jelly to protect O-rings
F
and seals, and to hold bearings and washers in place during assembly. Do not use grease.
11. Extreme care should be taken to avoid damage to O-rings, seals and gaskets when assembling.
12. After overhaul, refill the transfer with new ATF. G
13. When the all-mode 4WD transfer drain plug is removed, only some of the fluid is drained. Old all-mode
4WD transfer fluid will remain in torque converter and ATF cooling system. Always follow the proper pro-
cedure. Refer to MA-24, "Changing Transfer Fluid" .
H
Wiring Diagrams and Trouble Diagnosis EDS001CE
When you read wiring diagrams, refer to the following:
G GI-15, "How to Read Wiring Diagrams" . I
G PG-4, "POWER SUPPLY ROUTING CIRCUIT" for power distribution circuit.
When you perform trouble diagnosis, refer to the following:
J
G GI-11, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES".
G GI-27, "How to Perform Efficient Diagnosis for an Electrical Incident".
K
L
M
Revision: August 2007 TF-9 2004 QX56
ALL-MODE 4WD SYSTEM
ALL-MODE 4WD SYSTEM PFP:00000
Cross-sectional View EDS0017N
LDIA0053E
1. Center case 2. Chain 3. Multiple disc clutch
4. Rear case 5. Main shaft 6. Clutch hub assembly
7. Sub oil pump 8. Transfer motor 9. Control valve
10. Front drive shaft 11. Drain plug 12. 2-4 sleeve
13. Sun gear assembly 14. L-H sleeve 15. Planetary carrier assembly
16. Internal gear 17. Front case
Revision: August 2007 TF-10 2004 QX56
ALL-MODE 4WD SYSTEM
Control System EDS0017O
A
B
C
TF
E
F
G
H
I
J
K
L
M
WDIA0074E
Revision: August 2007 TF-11 2004 QX56
ALL-MODE 4WD SYSTEM
ALL-MODE 4WD TRANSFER BASIC CONTROL
LDIA0055E
HYDRAULIC CONTROL CIRCUITS
WDIA0056E
OUTLINE
All-mode 4WD transfer is controlled by the transfer control unit and sensors.
If a malfunction occurs in the all-mode 4WD system, the 4WD warning lamp lights up to indicate the system
malfunction. There are two ways to identify the cause of the malfunction.
1. Performing the self-diagnosis. (The 4WD warning lamp will indicate what kind of malfunction has occurred
by flickering.)
2. Performing diagnosis using CONSULT-II.
Revision: August 2007 TF-12 2004 QX56
ALL-MODE 4WD SYSTEM
CONTROL SYSTEM DIAGRAM
A
B
C
TF
E
F
WDIA0075E
INDICATIONS OF 4WD WARNING LAMP G
Condition Content 4WD warning lamp
During self-diagnosis Indicates the malfunction position by number of flickers. Flickers at malfunction mode.
H
Checks the lamp by turning ON during engine starting. After
Lamp check* ON
engine starts, it turns OFF if there are no malfunctions.
Turns ON to indicate malfunction. When ignition switch is
Malfunction in 4WD system*
turned to "OFF" or the malfunction is corrected, it turns OFF.
ON I
When vehicle is driven with different Flickers once every 2 seconds. Flickers once every 2 sec-
diameters of front and rear tires Turns OFF when ignition switch is "OFF". onds.
J
When fluid temperature is high or fluid temperature sensor cir-
High fluid temperature in transfer unit cuit is shorted, it flickers twice every second. Flickers twice a second.
It turns OFF when fluid temperature becomes normal.
Other than above (System is nor- K
Lamp is OFF. OFF
mal.)
*: When 4WD warning lamp is ON, all the 4WD shift indicator lamps turn OFF.
L
CAN Communication EDS0017P
SYSTEM DESCRIPTION
Refer to LAN-5, "CAN COMMUNICATION" . M
Revision: August 2007 TF-13 2004 QX56
ALL-MODE 4WD SYSTEM
Location of Electrical Parts EDS0017Q
WDIA0069E
Revision: August 2007 TF-14 2004 QX56
ALL-MODE 4WD SYSTEM
Description of Electrical Parts EDS0017R
TRANSFER MOTOR A
1. The transfer motor drives the sub-oil pump to provide proper lubrication and oil pressure control when the
vehicle is at standstill, during low-speed operations or is being driven in reverse.
2. The main oil pump is operated by the driving force of the mainshaft. In other words, sufficient oil pressure B
buildup does not occur when the vehicle is at standstill or during low-speed operations. While the vehicle
is being driven in reverse, the main oil pump rotates in the reverse direction. Therefore the main oil pump
does not discharge oil pressure. During any of the above vehicle operations, the transfer motor drives the C
sub-oil pump to compensate for insufficient oil pressure.
3. The transfer motor operates as follows:
1. The motor relay turns OFF in the 2WD mode. TF
2. The motor relay operates as described in the table below in modes other than the 2WD mode.
Table 1
E
PNP switch "R" position VFF (Vehicle speed) A/T position Motor relay drive command
ON -- R ON
Positions other than the "P" or F
0 ON
"N" positions
"P" or "N" position (See Table
-- --
2.)
OFF G
0 < VFF 50 km/h (31 MPH) -- ON
50 km/h (31 MPH) < VFF < 55
-- HOLD
km/h (34 MPH)
H
55 km/h (34 MPH) VFF -- OFF
Table 2
I
Throttle position
A/T position N-4L SW 4WD mode
0 - 0.07/8 0.07/8 - 1/8 1/8 - MAX
LOCK (4H) ON ON ON J
OFF Positions other than
N the LOCK position See NOTE. HOLD ON
(2WD or AUTO)
K
ON -- See NOTE. HOLD ON
P -- -- See NOTE. HOLD ON
NOTE: L
OFF (after 2.5 seconds have elapsed.)
4. 4WD shift switch, PNP switch, Neutral-4LO switch, vehicle speed sensor and throttle position sensor are
used in conjunction with the transfer motor. M
WAIT DETECTION SWITCH
1. The wait detection switch releases the "booming" torque produced in the propeller shaft. After the release
of the "booming" torque, the wait detection switch helps provide the 4WD lock gear (clutch drum) shifts. A
difference may occur between the operation ("4LO" to "4H" shift only) of the 4WD shift switch and actual
drive mode. At this point, the wait detection switch senses an actual drive mode.
2. The wait detection switch operates as follows:
4WD lock gear (clutch drum) locked: ON
4WD lock gear (clutch drum) released: OFF
3. The wait detection switch senses an actual drive mode and the 4WD shift indicator lamp indicates the
vehicle drive mode.
2-4WD SHIFT SOLENOID VALVE
The 2-4WD shift solenoid valve operates to apply oil pressure to the wet, multiplate clutch, depending on the
drive mode. The driving force is transmitted to the front wheels through the clutch when the vehicle is set in the
4WD mode. Setting the vehicle in the 2WD mode requires no pressure buildup. In other words, pressure force
applied to the wet, multiplate clutch becomes zero.
Revision: August 2007 TF-15 2004 QX56
ALL-MODE 4WD SYSTEM
LINE PRESSURE SWITCH
1. With the transfer system design, control of the oil pressure provides the transmission of drive torque to the
front wheels. The main pressure to control the oil pressure is referred to as the line pressure.
The line pressure switch determines whether or not adequate line pressure has built up under different
operating conditions.
2. The line pressure switch turns ON when line pressure is produced.
3. The line pressure switch senses line pressure abnormalities and turns the 4WD warning lamp ON.
Revision: August 2007 TF-16 2004 QX56
ALL-MODE 4WD SYSTEM
Circuit Diagram for Quick Pinpoint Check EDS0017S
A
B
C
TF
E
F
G
H
I
J
K
L
M
WDWA0033E
Revision: August 2007 TF-17 2004 QX56
ALL-MODE 4WD SYSTEM
Wiring Diagram -- T/F -- EDS0017T
WDWA0014E
Revision: August 2007 TF-18 2004 QX56
ALL-MODE 4WD SYSTEM
A
B
C
TF
E
F
G
H
I
J
K
L
M
WDWA0009E
Revision: August 2007 TF-19 2004 QX56
ALL-MODE 4WD SYSTEM
WDWA0034E
Revision: August 2007 TF-20 2004 QX56
ALL-MODE 4WD SYSTEM
A
B
C
TF
E
F
G
H
I
J
K
L
M
WDWA0035E
Revision: August 2007 TF-21 2004 QX56
ALL-MODE 4WD SYSTEM
WDWA0004E
Revision: August 2007 TF-22 2004 QX56
ALL-MODE 4WD SYSTEM
A
B
C
TF
E
F
G
H
I
J
K
L
M
WDWA0036E
Revision: August 2007 TF-23 2004 QX56
ALL-MODE 4WD SYSTEM
WDWA0005E
Revision: August 2007 TF-24 2004 QX56
ALL-MODE 4WD SYSTEM
A
B
C
TF
E
F
G
H
I
J
K
L
M
WDWA0037E
Revision: August 2007 TF-25 2004 QX56
ALL-MODE 4WD SYSTEM
WDWA0038E
Revision: August 2007 TF-26 2004 QX56
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION PFP:00000
A
Trouble Diagnosis without CONSULT-II EDS0017U
DESCRIPTION
If the engine starts when there is something wrong with the all-mode 4WD system, the 4WD warning lamp B
turns ON or flickers in the combination meter. When the system functions properly, the warning lamp turns ON
when the ignition switch is turned to ON, and it turns OFF after eng◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo