2003 NISSAN X-TRAIL relay

FUEL TRANSPORT PUMP
EC-1487
[YD (WITHOUT EURO-OBD)]
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FUEL TRANSPORT PUMPPFP:17020
DescriptionEBS0126G
SYSTEM DESCRIPTION
Fuel supply entrance of fuel tank is at the left side of fuel tank. The duel at the right side of the fuel tank is sent
to the left side of the fuel tank by fuel transport pump.
When the ECM receives engine revolution signal from the crankshaft position sensor, it knows that the engine
is rotating, and causes the pump operate. If the remainder of the fuel at the right side of the fuel tank
decreases, fuel level switch sends a signal to the ECM. When the ECM receives a signal from the fuel level
switch, the ECM stops the operation of the pump.
The ECM does not directly drive the fuel transport pump. It controls the ON/OFF fuel transport pump relay,
which in turn controls the fuel transport pump.
COMPONENT DESCRIPTION
Fuel Transport Pump
Fuel transport pump sends the fuel from right side of fuel tank to left
side.
Fuel Level Switch
Fuel level switch is assembled in sub fuel level sensor unit. When the remainder of the fuel at the right side of
the fuel tank is less than specified value, the switch is turned OFF.
Sensor Input Signal to ECM ECM function Actuator
Crankshaft position sensor Engine speed
Fuel transport pump control Fuel transport pump relay
Fuel level switch Fuel level
Condition Fuel transport pump operation
Engine is running.Operates
Engine is stopped.Stops
The remainder of the fuel in the fuel tank is less than specified value. Stops
PBIB1887E
PBIB0469E

EC-1488
[YD (WITHOUT EURO-OBD)]
FUEL TRANSPORT PUMP

ECM Terminals and Reference ValueEBS0126H
Specification data are reference values, and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage)
14 W/PU Fuel level switch[Ignition switch ON]

Some fuel is in the fuel tankApproximately 0V
[Ignition switch ON]

No fuel is in the fuel tankBATTERY VOLTAGE
(11 - 14V)
39 B/OR Fuel transport pump relay[Engine is running]

Some fuel is in the fuel tankApproximately 0V
[Engine is running]

No fuel is in the fuel tankBATTERY VOLTAGE
(11 - 14V)

EC-1492
[YD (WITHOUT EURO-OBD)]
FUEL TRANSPORT PUMP

3. CHECK FUEL TRASPORT PUMP RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Reconnect ECM harness connector.
3. Disconnect fuel transport pump relay.
4. Turn ignition switch ON.
5. Check voltage between fuel transport pump relay terminals 1, 5
and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4. DETECT MALFUNCTIONING PERT
Check the following.

Harness connectors M17, B1

Fuse block (J/B) connectors M1

15A fuse

Harness for open or short between fuse and fuel transport pump relay
>> Repair harness or connectors.
5. CHECK FUEL TRANSPORT PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND
SHORT
1. Turn ignition switch OFF.
2. Disconnect fuel transport pump harness connector.
3. Check harness continuity between fuel transport pump relay ter-
minal 3 and fuel transport pump terminal 1 and between fuel
transport pump terminal 2 and ground. Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
PBIB1933E
Voltage: Battery voltage
PBIB0471E
Continuity should exist.
PBIB1931E

FUEL TRANSPORT PUMP
EC-1493
[YD (WITHOUT EURO-OBD)]
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6. DETECT MALFUNCTIONING PART
Check the following.

Harness connector B22, B128

Harness for open or short between fuel transport pump relay and fuel transport pump

Harness for open or short between fuel transport pump and ground
>> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK FUEL TRANSPORT PUMP RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 39 and fuel transport pump relay terminal 2. Refer to
Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> GO TO 8.
8. DETECT MALFUNSTIONING PART
Check the following.

Harness connector M17, B1 (LHD models)

Harness connector M18, B2 (RHD models)

Harness connector M63, F30

Harness for open or short between ECM and fuel transport pump relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK FUEL TRANSPORT PUMP RELAY
Refer to EC-1494, "
Component Inspection" .
OK or NG
OK >> GO TO 10.
NG >> Replace fuel transport pump relay.
10. CHECK TRANSPORT PUMP
Refer to EC-1494, "
Component Inspection" .
OK or NG
OK >> GO TO 14.
NG >> Replace fuel transport pump.Continuity should exist.

EC-1494
[YD (WITHOUT EURO-OBD)]
FUEL TRANSPORT PUMP

11 . CHECK FUEL LEVEL SWITCH POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect sub fuel level sensor unit harness connector.
4. Check harness continuity between ECM terminal 14 and sub
fuel level sensor unit terminal 2, between sub fuel level sensor
unit terminal 4 and ground. Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> GO TO 8.
12. DETECT MALFUNCTIONING PART
Check the following.

Harness connector F30, M63

Harness connector M78, B105 (LHD models)

Harness connectors M18, B2 (RHD models)

Harness for open or short between sub fuel level sensor unit and ground.
>> Repair open circuit or short to ground or short to power in harness or connectors.
13. CHECK FUEL LEVEL SWITCH
Refer to EC-1494, "
Component Inspection"
OK or NG
OK >> GO TO 14.
NG >> Replace sub fuel level sensor unit.
14. CHECK INTERMITTENT INCIDENT
Refer to EC-1260, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>>INSPECTION END
Component InspectionEBS0126K
FUEL TRANSPORT PUMP RELAY
Check continuity between terminals 3 and 5 under the following coni-
tions.Continuity should exist.
PBIB1944E
Conditions Continuity
12V direct current supply between terminals 1 and 2 Yes
No current supply No
PBIB0098E

TF-1
TRANSFER
D DRIVELINE/AXLE
CONTENTS
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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

TROUBLE DIAGNOSIS
TF-27
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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-28
TROUBLE DIAGNOSIS

4WD Control Unit Input/Output Signal Reference ValuesEDS001VK
4WD CONTROL UNIT INSPECTION TABLE
Specifications with CONSULT-II
Monitored item [Unit] Content Condition Display value
FR RH SENSOR [km/h] or [mph]Wheel speed (Front wheel
right)Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle running
CAUTION:
Check air pressure of tire under
standard condition.Approximately equal to
the indication on speed-
ometer (Inside of ±10%)
FR LH SENSOR [km/h] or [mph]Wheel speed (Front wheel
left)Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle running
CAUTION:
Check air pressure of tire under
standard condition.Approximately equal to
the indication on speed-
ometer (Inside of ±10%)
RR RH SENSOR [km/h] or [mph]Wheel speed (Rear wheel
right)Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle running
CAUTION:
Check air pressure of tire under
standard condition.Approximately equal to
the indication on speed-
ometer (Inside of ±10%)
RR LH SENSOR [km/h] or [mph]Wheel speed (Rear wheel
left)Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle running
CAUTION:
Check air pressure of tire under
standard condition.Approximately equal to
the indication on speed-
ometer (Inside of ±10%)
BATTERY VOLT [V]Power supply voltage for
4WD control unitIgnition switch: ON Battery voltage
THRTL POS SEN [%] Throttle opening conditionWhen depressing accelerator pedal
(Value rises gradually in response to
throttle position.)0 - 100%
ETS SOLENOID [A]Monitored value of current at
4WD solenoidEngine speed
: At idle2WD Approx. 0.000A
AUTO Approx. 0.000A
LOCK Approx. 0.000A
Engine speed
: 3,000 rpm or more con-
stant2WD Approx. 0.000A
AUTO Approx. 0.000 - 1.500A*
LOCK Approx. 2.800A
STOP LAMP SW [ON/OFF]Condition of brake pedal
operationBrake pedal: Depressed ON
Brake pedal: Released OFF
ENG SPEED SIG [RUN/STOP] Condition of engine runningEngine stopped
(Engine speed: Less than 400 rpm)STOP
Engine running
(Engine speed: 400 rpm or more)RUN
ETS ACTUATOR [ON/OFF]Operating condition of 4WD
actuator relay (integrated in
4WD control unit)Engine stopped (Ignition
switch: ON)OFF
Engine running ON
4WD WARN LAMP [ON/OFF] 4WD warning lamp condition4WD warning lamp: ON ON
4WD warning lamp: OFF OFF
4WD MODE SW [2WD/AUTO/
LOCK]Input condition from 4WD
mode switch4WD mode switch2WD 2WD
AUTO AUTO
LOCK LOCK