2003 NISSAN X-TRAIL ECO mode

TF-2 DIAGNOSTIC PROCEDURE .............................. 40
COMPONENT INSPECTION .............................. 42
Engine Control Signal ............................................. 42
DIAGNOSTIC PROCEDURE .............................. 42
CAN Communication Line ...................................... 43
DIAGNOSTIC PROCEDURE .............................. 43
TROUBLE DIAGNOSIS FOR SYMPTOMS .............. 44
4WD Indicator Lamp and LOCK Indicator Lamp Do
Not Turn ON for Approx. 1 Second When The Igni-
tion Switch Is Turned to ON .................................... 44
DIAGNOSTIC PROCEDURE .............................. 44
4WD Warning Lamp Does Not Turn ON When The
Ignition Switch Is Turned to ON .............................. 45
DIAGNOSTIC PROCEDURE .............................. 45
4WD Warning Lamp Does Not Turn OFF Several
Seconds after Engine Started ................................. 46
DIAGNOSTIC PROCEDURE .............................. 46
4WD Mode Cannot Be Switched after Engine Is
Started .................................................................... 47
DIAGNOSTIC PROCEDURE .............................. 47
Heavy Tight-corner Braking Symptom Occurs
When The Vehicle Is Driven in AUTO Mode and The
Steering Wheel Is Turned Fully to Either Side after
The Engine Is Started ............................................. 48
DIAGNOSTIC PROCEDURE .............................. 48
Vehicle Does Not Enter 4WD Mode Even Though
4WD Warning Lamp Turned to OFF ....................... 49
DIAGNOSTIC PROCEDURE .............................. 50
While Driving, 4WD Warning Lamp Flashes Rapidly
(When Flashing in Approx. 1 Minute and Then Turn-
ing OFF) ................................................................. 50
While Driving, 4WD Warning Lamp Flashes Slowly
(When Continuing to Flash until Turning Ignition Switch OFF) ............................................................ 51
DIAGNOSTIC PROCEDURE ............................... 51
4WD CONTROL UNIT ............................................... 52
Removal and Installation ......................................... 52
REMOVAL ............................................................ 52
INSTALLATION .................................................... 52
SIDE OIL SEAL ......................................................... 53
Removal and Installation ......................................... 53
REMOVAL ............................................................ 53
INSTALLATION .................................................... 53
AIR BREATHER HOSE ............................................. 54
Components ............................................................ 54
Removal and Installation ......................................... 54
TRANSFER ASSEMBLY ........................................... 55
Removal and Installation ......................................... 55
COMPONENTS ................................................... 55
REMOVAL ............................................................ 55
INSTALLATION .................................................... 56
Disassembly and Assembly .................................... 57
COMPONENTS ................................................... 57
ASSEMBLY INSPECTION ................................... 58
DISASSEMBLY .................................................... 62
INSPECTION AFTER DISASSEMBLY ................ 66
SELECTING ADJUSTING SHIMS ....................... 67
ASSEMBLY .......................................................... 68
SERVICE DATA AND SPECIFICATIONS (SDS) ...... 74
General Specifications ............................................ 74
Inspection and Adjustment ...................................... 74
PRELOAD TORQUE BEFORE DISASSEMBLY ... 74
PRELOAD TORQUE AFTER DISASSEMBLY
AND REASSEMBLY ............................................ 74
BACKLASH .......................................................... 74
COMPANION FLANGE RUNOUT ....................... 74
SELECTIVE PARTS ............................................ 74

ALL MODE 4X4 SYSTEM
TF-11
C
E
F
G
H
I
J
K
L
MA
B
TF

4WD MODE SWITCH
AUTO Mode

Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions.

4WD mode makes possible stable driving, with no wheel spin, on snowy roads or other slippery surfaces.

On roads which do not require 4WD, AUTO mode contributes to improved fuel economy by driving in con-
ditions close to front-wheel drive.

Sensor inputs determine the vehicle's turning condition, and tight cornering/braking are controlled by dis-
tributing optimum torque to rear wheels.
LOCK Mode

Front/rear wheel torque distribution is fixed, ensuring stable driving when climbing slopes.

Vehicle will switch automatically to AUTO mode if vehicle speed increases. If vehicle speed then
decreases, the vehicle automatically returns to direct 4-wheel driving conditions.

LOCK mode will change to AUTO mode automatically, when the vehicle speed exceeds approx. 30 km/h
(19 MPH). The LOCK indicator light keeps illuminating.
NOTE:
If there is a significant difference in pressure or wear between tires, full vehicle performance is not available.
LOCK mode may be prohibited, or speeds at which LOCK mode is enabled may be restricted detecting tire
conditions.
2WD Mode
Vehicle is in front-wheel drive.
NOTE:

If front wheels are slipping in 2WD mode, do not switch to AUTO or LOCK. This can cause difficulties for
the system.

Even if the 4WD mode switch is in 2WD mode, the 4WD control unit occasionally automatically change to
AUTO mode depending on the driving condition (For example; Depressing the acceleration firmly). This is
not malfunction. However, 4WD indicator lamp dose not illuminate.
4WD INDICATOR LAMP AND LOCK INDICATOR LAMP
The following is the indications of indicator lamp.
4WD WARNING LAMP
Turns ON when there is a malfunction in 4WD system. It indicates that the vehicle is in fail-safe mode and
change to front-wheel drive or shifting driving force-4WD (Rear-wheels still have some driving torque).
Also turns ON when ignition switch is turned ON, for purpose of lamp check. Turns OFF approximately for 1
seconds after the engine starts if system is normal.
4WD Warning Lamp Indication
Condition 4WD indicator lamp LOCK indicator lamp
AUTO mode ON OFF
LOCK mode ON ON
2WD mode OFF OFF
Lamp check Turns ON for approx. 1 second when ignition switch is turned ON.
SDIA2298E
Condition 4WD warning lamp
Lamp checkTurns ON when ignition switch is turned ON. Turns OFF
approx. 1 seconds after engine start.
4WD system malfunctionON
Protection function is activated due to heavy load to electric con-
trolled coupling. (4WD system is not malfunctioning and 4WD system
changes to 2WD mode.)Rapid flashing: 2 times/second
(Flashing in approx. 1 minute and then turning OFF.)

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

TROUBLE DIAGNOSIS
TF-27
C
E
F
G
H
I
J
K
L
MA
B
TF

Trouble Diagnosis Chart for SymptomsEDS001VJ
If 4WD warning lamp turns ON, perform self-diagnosis. Refer to TF-30, "SELF-DIAG RESULT MODE" .
NOTE:

Light tight-corner braking symptom may occur depending on driving conditions in AUTO mode. This is not malfunction.

Heavy tight-corner braking symptom occurs when vehicle is driven in the following conditions: LOCK mode, steering
wheel is turned fully to either sides, and accelerator pedal was depressed.Symptom Condition Check item Reference page
4WD indicator lamp and LOCK indicator
lamp do not turn ON for approx. 1 second
when the ignition switch is turned to ON.
(4WD indicator lamp and LOCK indicator
lamp check)Ignition switch: ONCAN communication line
TF-44
Power supply and ground for 4WD con-
trol unit
Unified meter control unit
4WD warning lamp does not turn ON when
the ignition switch is turned to ON.
(4WD warning lamp check)Ignition switch: ONCAN communication line
TF-45
Unified meter control unit
4WD warning lamp does not turn OFF sev-
eral seconds after engine started.Engine runningCAN communication line
TF-46
Power supply and ground for 4WD con-
trol unit
Unified meter control unit
4WD solenoid
4WD actuator relay (integrated in 4WD
control unit)
Wheel sensor
4WD mode cannot be switched after engine
is started.Engine running4WD mode switch
TF-47
CAN communication line
Unified meter control unit
Heavy tight-corner braking symptom occurs
when the vehicle is driven in AUTO mode
and the steering wheel is turned fully to
either side after the engine is started. (See
NOTE.)

While driving

AUTO mode

Steering wheel is
turned fully to either
sidesCAN communication line
TF-48
4WD mode switch
Accelerator pedal position signal
4WD solenoid
Mechanical malfunction of electric con-
trolled coupling (clutch sticking etc.)
Vehicle does not enter 4WD mode even
though 4WD warning lamp turned to OFF.Vehicle speed: 10 km/h
(6 MPH) or less4WD solenoid
TF-49
Mechanical malfunction of electric con-
trolled coupling (Mechanical engage-
ment of clutch is not possible.)
Vehicle speed: 10 km/h
(6 MPH) or moreOperating condition of parking brake
4WD solenoid
Mechanical malfunction of electric con-
trolled coupling (Mechanical engage-
ment of clutch is not possible.)
While driving, 4WD warning lamp flashes
rapidly. (When flashing in approx. 1 minute
and then turning OFF.)
Rapid flashing: 2 times/second

While driving

AUTO mode and
LOCK modeProtection function is activated due to
heavy load to electric controlled cou-
pling. (4WD system is not malfunction-
ing.)TF-50
While driving, 4WD warning lamp flashes
slowly. (When continuing to flash until turn-
ing ignition switch OFF)
Slow flashing: 1 time/2 seconds
While driving

Vehicle speed: 20 km/h
(12 MPH) or moreTire size is different between front and
rear of vehicle.TF-51

TF-34
TROUBLE DIAGNOSIS FOR SYSTEM

2. CHECK GROUND CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect 4WD control unit harness connector.
3. Check continuity between 4WD control unit harness connector
M107 terminals 10 (B/R), 11 (B/R) and ground.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
3. CHECK DTC
Start engine.
Does 4WD warning lamp turn OFF?
YES >>INSPECTION END
NO >> Perform the self-diagnosis, repair or replace damaged parts. Refer to TF-30, "
SELF-DIAG
RESULT MODE" .
4WD Control UnitEDS001VN
DIAGNOSTIC PROCEDURE

Check the following if “CONTROLLER FAILURE [C1201]” is displayed in self-diagnostic results of CON-
SULT-II.
1. PERFORM SELF-DIAGNOSIS
With CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “ALL MODE AWD/4WD” with CONSULT-II.
3. Touch “ERASE”.
4. Turn ignition switch “OFF” and wait at least 10 seconds.
5. Perform the self-diagnosis again.
Is the
“CONTROLLER FAILURE [C1201]” displayed?
YES >> Replace 4WD control unit. Refer to TF-52, "4WD CONTROL UNIT" .
NO >>INSPECTION END
ABS SystemEDS001VO
DIAGNOSTIC PROCEDURE

Check the following if “ABS SYSTEM [C1203]” is displayed in self-diagnostic results of CONSULT-II.
1. CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) OR ESP/TCS/ABS/
CONTROL UNIT
Perform self-diagnosis with ABS actuator and electric unit (control unit) (without ESP) or ESP/TCS/ABS con-
trol unit (with ESP). Refer to BRC-27, "
SELF-DIAGNOSIS" (without ESP) or BRC-79, "SELF-DIAGNOSIS"
(with ESP).
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 2.Continuity should exist.
SDIA2305E

TF-42
TROUBLE DIAGNOSIS FOR SYSTEM

6. CHECK 4WD INDICATOR LAMP AND LOCK INDICATOR LAMP
1. Turn ignition switch “OFF”.
2. Check 4WD indicator lamp and LOCK indicator lamp “ON” for approx. 1 second when the ignition switch
is turned “ON”.
Do 4WD indicator lamp and LOCK indicator lamp
“ON” for approx. 1 second?
YES >>INSPECTION END
NO >> Go to TF-44, "
4WD Indicator Lamp and LOCK Indicator Lamp Do Not Turn ON for Approx. 1 Sec-
ond When The Ignition Switch Is Turned to ON" .
COMPONENT INSPECTION
1. Turn ignition switch “OFF”.
2. Disconnect 4WD mode switch harness connector.
3. Operate 4WD mode switch and check continuity between 4WD
mode switch harness connector terminals.
4. If NG, replace 4WD mode switch.
Engine Control SignalEDS0026S
DIAGNOSTIC PROCEDURE

Check the following if “ENGINE SIGNAL 1 [C1210]” is displayed in self-diagnosis results of CONSULT-II.
1. CHECK DTC WITH ECM
Perform self-diagnosis with ECM. Refer to EC-52, "
Emission-related Diagnostic Information" (QR engine
models with EURO-OBD), EC-513, "
Emission-related Diagnostic Information" (QR engine models without
EURO-OBD), EC-892, "
Emission-related Diagnostic Information" (YD engine models with EURO-OBD), EC-
1223, "Diagnostic Trouble Code (DTC)" (YD engine models without EURO-OBD).
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 2.
2. CHECK 4WD CONTROL UNIT
Check 4WD control unit input/output signal. Refer to TF-28, "
4WD Control Unit Input/Output Signal Reference
Va l u e s" .
OK or NG
OK >> GO TO 3.
NG >> Check 4WD control unit pin terminals for damage or loose connection with harness connector. If
any item is damaged, repair or replace damaged parts.
3. CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >>INSPECTION END
NG >> Perform self-diagnosis with ECM again. Refer to EC-52, "
Emission-related Diagnostic Informa-
tion" (QR engine models with EURO-OBD), EC-513, "Emission-related Diagnostic Information"
(QR engine models without EURO-OBD), EC-892, "Emission-related Diagnostic Information" (YD
Connector Terminal Condition Continuity
M392 - 44WD mode switch: AUTO Yes
Except the above No
3 - 44WD mode switch: LOCK Yes
Except the above No
4 - 74WD mode switch: 2WD Yes
Except the above No
SDIA2302E

TF-44
TROUBLE DIAGNOSIS FOR SYMPTOMS

TROUBLE DIAGNOSIS FOR SYMPTOMSPFP:00007
4WD Indicator Lamp and LOCK Indicator Lamp Do Not Turn ON for Approx. 1
Second When The Ignition Switch Is Turned to ON
EDS001VT
DIAGNOSTIC PROCEDURE
1. CHECK SYSTEM FOR CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to TF-30, "
SELF-DIAG RESULT MODE" .
Is the
“CAN COMM CIRCUIT [U1000]” displayed?
YES >> Perform trouble diagnosis for CAN communication line. Refer to LAN-4, "CAN Communication
Unit" .
NO >> GO TO 2.
2. CHECK 4WD CONTROL UNIT POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect 4WD control unit harness connector.
3. Turn ignition switch “ON”. (Do not start engine.)
4. Check voltage between 4WD control unit harness connector ter-
minals and ground.
5. Turn ignition switch “OFF”.
6. Check voltage between 4WD control unit harness connector ter-
minals and ground.
OK or NG
OK >> GO TO 3.
NG >> Check the following. If any items are damaged, repair or
replace damaged parts.

10A fuse [No. 8 located in the fuse block (J/B) or No. 37, located in the fuse and fusible link box]

Harness for short or open between battery and 4WD control unit harness connector terminal 9

Harness for short or open between ignition switch and 4WD control unit harness connector ter-
minal 7

Ignition switch. Refer to PG-2, "POWER SUPPLY ROUTING" .
Connector Terminal (Wire color) Voltage (Approx.)
M1077 (GY) - Ground
Battery voltage
9 (P/L) - Ground
SDIA2304E
Connector Terminal (Wire color) Voltage (Approx.)
M1077 (GY) - Ground 0V
9 (P/L) - Ground Battery voltage
SDIA2321E