2003 NISSAN X-TRAIL diagram

TF-1
TRANSFER
D DRIVELINE/AXLE
CONTENTS
C
E
F
G
H
I
J
K
L
M
SECTION
A
B
TF

TRANSFER
PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Precautions .............................................................. 3
Service Notice .......................................................... 4
Wiring Diagrams and Trouble Diagnosis .................. 4
PREPARATION ........................................................... 5
Special Service Tools ............................................... 5
NOISE, VIBRATION AND HARSHNESS (NVH)
TROUBLESHOOTING ................................................ 8
NVH Troubleshooting Chart ..................................... 8
TRANSFER OIL .......................................................... 9
Replacement ............................................................ 9
DRAINING ............................................................. 9
FILLING ................................................................. 9
Inspection ................................................................. 9
OIL LEAKAGE AND OIL LEVEL ........................... 9
ALL MODE 4X4 SYSTEM ........................................ 10
Power Transfer Diagram ........................................ 10
System Description ................................................ 10
ELECTRIC CONTROLLED COUPLING ............. 10
4WD CONTROL UNIT ........................................ 10
4WD MODE SWITCH .......................................... 11
4WD INDICATOR LAMP AND LOCK INDICATOR
LAMP ................................................................... 11
4WD WARNING LAMP ........................................ 11
System Diagram ..................................................... 12
COMPONENTS FUNCTION DESCRIPTION ..... 13
CAN Communication .............................................. 13
SYSTEM DESCRIPTION .................................... 13
CAN COMMUNICATION UNIT (M/T MODELS
WITHOUT ESP) .................................................. 13
CAN COMMUNICATION UNIT (A/T MODELS
WITHOUT ESP) .................................................. 14
CAN COMMUNICATION UNIT (M/T MODELS
WITH ESP) .......................................................... 15
CAN COMMUNICATION UNIT (A/T MODELS
WITH ESP) .......................................................... 16
TROUBLE DIAGNOSIS ............................................ 18Fail-safe Function ................................................... 18
How to Perform Trouble Diagnosis ......................... 18
BASIC CONCEPT ............................................... 18
Location of Electrical Parts ..................................... 19
Circuit Diagram ....................................................... 20
Wiring Diagram — 4WD — ..................................... 21
LHD MODELS ..................................................... 21
RHD MODELS .................................................... 24
Trouble Diagnosis Chart for Symptoms .................. 27
4WD Control Unit Input/Output Signal Reference
Values ..................................................................... 28
4WD CONTROL UNIT INSPECTION TABLE ..... 28
CONSULT-II Function ............................................. 29
FUNCTION .......................................................... 29
CONSULT-II SETTING PROCEDURE ................ 29
SELF-DIAG RESULT MODE ............................... 30
DATA MONITOR MODE ...................................... 31
ACTIVE TEST MODE ......................................... 32
4WD CONTROL UNIT PART NUMBER .............. 32
TROUBLE DIAGNOSIS FOR SYSTEM .................... 33
Power Supply Circuit for 4WD Control Unit ............ 33
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ................................................ 33
DIAGNOSTIC PROCEDURE .............................. 33
4WD Control Unit .................................................... 34
DIAGNOSTIC PROCEDURE .............................. 34
ABS System ........................................................... 34
DIAGNOSTIC PROCEDURE .............................. 34
4WD Solenoid ......................................................... 36
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ................................................ 36
DIAGNOSTIC PROCEDURE .............................. 36
COMPONENT INSPECTION .............................. 38
4WD Actuator Relay ............................................... 38
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ................................................ 38
DIAGNOSTIC PROCEDURE .............................. 38
4WD Mode Switch .................................................. 40
CONSULT-II REFERENCE VALUE IN DATA
MONITOR MODE ................................................ 40

TF-4
PRECAUTIONS

Service NoticeEDS001V7

After overhaul refill the transfer with new transfer oil.

Check the oil level or replace the oil only with the vehicle parked on level ground.

During removal or installation, keep inside of transfer clear of dust or dirt.

Replace all tires at the same time. Always use tires of the proper size and the same brand and pattern.
Fitting improper size and unusual wear tires applies excessive force to vehicle mechanism and can cause
longitudinal vibration.

Disassembly should be done in a clean work area.

Before proceeding with disassembly, thoroughly clean the transfer. It is important to prevent the internal
parts from becoming contaminated by dirt or other foreign matter.

Check for the correct installation status prior to removal or disassembly. If matching marks are required,
be certain they do not interfere with the function of the parts when applied.

All parts should be carefully cleaned with a general purpose, non-flammable solvent before inspection or
reassembly.

Check appearance of the disassembled parts for damage, deformation, and unusual wear. Replace them
with a new ones if necessary.

Gaskets, seals, O-rings and lock nuts should be replaced any time when the transfer is disassembled.

In principle, tighten bolts or nuts gradually in several steps working diagonally from inside to outside. If
tightening sequence is specified, use it.

Observe the specified torque when assembling.

Clean and flush the parts sufficiently and blow-dry them.

Be careful not to damage sliding surfaces and mating surfaces.

Use lint-free cloth or towels for wiping parts clean. Common shop rags can leave fibers that could interfere
with the operation of the transfer.
Wiring Diagrams and Trouble DiagnosisEDS001V8
When reading wiring diagrams, refer to the following:

GI-14, "How to Read Wiring Diagrams".

PG-2, "POWER SUPPLY ROUTING".
When performing trouble diagnosis, refer to the following:

GI-10, "How to Follow Trouble Diagnoses".

GI-23, "How to Perform Efficient Diagnosis for an Electrical Incident".

TF-10
ALL MODE 4X4 SYSTEM

ALL MODE 4X4 SYSTEMPFP:47850
Power Transfer DiagramEDS001VA
System DescriptionEDS001VB
ELECTRIC CONTROLLED COUPLING
Operation Principle
1. The 4WD control unit supplies command current to electric con-
trolled coupling (4WD solenoid).
2. The control clutch is engaged by electromagnet and torque is
detected in control clutch.
3. The cam operates in response to control clutch torque and
applies pressure to main clutch.
4. The main clutch transmits torque to front wheels according to
pressing power.

Transmission torque to the rear wheels is determined accord-
ing to command current.
4WD CONTROL UNIT

4WD controls distribution of drive power between front-wheel
drive (100:0) and 4WD (50:50) conditions according to signals
from sensors.

Self-diagnosis can be done with CONSULT-II.
SDIA1607E
SFIA0284E
SDIA1844E
SDIA2285E

TF-12
ALL MODE 4X4 SYSTEM

System DiagramEDS001VC
Large difference in diameter of front/rear tiresSlow flashing: 1 time/2 seconds
(Continuing to flash until turning ignition switch OFF)
Other than above (system normal) OFFCondition 4WD warning lamp
SDIA1866E

ALL MODE 4X4 SYSTEM
TF-13
C
E
F
G
H
I
J
K
L
MA
B
TF

COMPONENTS FUNCTION DESCRIPTION
CAN CommunicationEDS0027K
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
CAN COMMUNICATION UNIT (M/T MODELS WITHOUT ESP)
System diagram
Component parts Function
4WD control unit

Controls driving force distribution by signals from each sensor and switch from front wheel driving
mode (100:0) to 4WD mode (50:50).

2WD mode is available by fail-safe function if malfunction is detected in electrical system.
Wheel sensors Detects wheel speed.
4WD solenoid Controls electric controlled coupling by operation signal from 4WD control unit.
Electric controlled coupling Transmits driving force to rear final drive.
4WD mode switch Able to select from 2WD, AUTO or LOCK mode.
4WD warning lamp

Illuminates if malfunction is detected in electrical system of 4WD system.

There is 1 blink in 2 seconds if rotation difference of front wheels and rear wheels is large.

There are 2 blinks in 1 second if load is still applied to driving parts.
4WD indicator lamp Indicate operation with optimal distribution of torque to front/rear wheels.
LOCK indicator lamp Indicate that 4WD system is under direct 4-wheel driving mode.
ABS actuator and electric unit
(control unit) (without ESP) or
ESP/TCS/ABS control unit (with
ESP)Transmits the following signals via CAN communication to 4WD control unit.

Vehicle speed signal

Stop lamp switch signal (brake signal)
ECMTransmits the following signals via CAN communication to 4WD control unit.

Accelerator pedal position signal

Engine speed signal
Unified meter control unit Transmits conditions of parking brake switch via CAN communication to 4WD control unit.
PKIA6458E

TF-14
ALL MODE 4X4 SYSTEM

Input/output signal chart
T: Transmit R: Receive
CAN COMMUNICATION UNIT (A/T MODELS WITHOUT ESP)
System diagram
Input/output signal chart
T: Transmit R: Receive Signals ECMABS actuator and
electric unit
(control unit)4WD control unit Combination meter
Stop lamp switch signal T R
Engine speed signal T R R
Engine coolant temperature signal T R
Accelerator pedal position signal T R
A/C compressor feedback signal T R
Vehicle speed signalTRR
RT
ABS warning lamp signal T R
4WD warning lamp signalTR
4WD mode indicator lamp signal T R
Parking brake switch signalRT
MI signal T R
PKIA6457E
Signals ECM TCMABS actuator
and electric unit
(control unit)4WD control
unitCombination
meter
Stop lamp switch signalRT
TR
P·N range signal R T
A/T position indicator lamp signal T R
Overdrive control switch signal R T
O/D OFF indicator signal T R
Closed throttle position signal T R
Wide open throttle position signal T R

ALL MODE 4X4 SYSTEM
TF-15
C
E
F
G
H
I
J
K
L
MA
B
TF

CAN COMMUNICATION UNIT (M/T MODELS WITH ESP)
System diagram
Input/output signal chart
T: Transmit R: Receive Engine speed signal T R R
Engine coolant temperature signal TR
Accelerator pedal position signal T R
Output shaft revolution signal R T
A/C compressor feedback signal TR
Vehicle speed signalTRR
RT
ABS warning lamp signal T R
4WD warning lamp signalTR
4WD mode indicator lamp signalTR
Parking brake switch signalRT
MI signal TR
Engine A/T integrated control signalTR
RT
A/T self-diagnosis signal R TSignals ECM TCMABS actuator
and electric unit
(control unit)4WD control
unitCombination
meter
PKIA6459E
Signals ECMESP/TCS/ABS
control unitSteering angle
sensor4WD control
unitCombination
meter
Stop lamp switch signal T R
Engine speed signal T R R R
Engine coolant temperature signal TR
Accelerator pedal position signal T R R
A/C switch signal*
1RT
A/C compressor feedback signal*
2TR

TF-16
ALL MODE 4X4 SYSTEM

*1: YD engine models only
*2: QR engine models only
CAN COMMUNICATION UNIT (A/T MODELS WITH ESP)
System diagram
Input/output signal chart
T: Transmit R: Receive Vehicle speed signalTRR
RT
ABS warning lamp signal T R
Brake warning lamp signal T R
SLIP indicator lamp signal T R
ESP OFF indicator lamp signal T R
4WD warning lamp signalTR
4WD mode indicator lamp signalTR
Parking brake switch signalRT
MI signal TR
Glow indicator lamp signal*
1TR
Steering angle sensor signal R TSignals ECMESP/TCS/ABS
control unitSteering angle
sensor4WD control
unitCombination
meter
PKIA6460E
Signals ECM TCMESP/TCS/
ABS control
unitSteering
angle sensor4WD control
unitCombination
meter
Stop lamp switch signalRT
TR
P·N range signal R T
A/T position indicator lamp signal T R R
O/D OFF indicator signal T R
Overdrive control switch signal R T
Closed throttle position signal T R
Wide open throttle position signal T R