sensor NISSAN X-TRAIL 2003 Electronic Repair Manual

BRC-48
[4WD/ABS]
WHEEL SENSORS
WHEEL SENSORS
PFP:47910
Removal and InstallationEFS001C1
CAUTION:
lBe careful not to damage sensor edge and rotor tooth. Before removing front or rear wheel hub,
remove wheel speed sensor to avoid sensor wiring damage. Otherwise, sensor may be deacti-
vated.
lWhen removing sensor, avoid rotating it as much as possible. Do not forcibly pull sensor harness.
lWhen installing, check sensor pick-up and mounting hole for foreign material such as iron chips.
Check no foreign material has been caught in sensor rotor. Remove any foreign material found.
Tighten mounting bolts and nuts to the specified torque.
SFIA0042E

G-SENSOR (4WD MODEL ONLY)
BRC-49
[4WD/ABS]
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G-SENSOR (4WD MODEL ONLY)PFP:47930
Removal and InstallationEFS001C2
CAUTION:
Be careful not to drop or bump G -sensor because it is sensitive to impact.
1. Remove center console and instrument. Refer to applicable sec-
tion inIP-3, "
INSTRUMENT PANEL ASSEMBLY".
2. Disconnect G -sensor connector.
3. Remove mounting nuts and remove G -sensor.
Install in the reverse order of removal observing the precautions
above.
SFIA0065E

BRC-50
[4WD/ABS]
SENSOR ROTOR
SENSOR ROTOR
PFP:47970
Removal and InstallationEFS001C3
REMOVAL
Front
1. Remove drive shaft. Refer toFAX-11, "REMOVAL"in “FAX Front Axle/Drive Shaft”.
2. Remove sensor rotor from drive shaft. Refer toFAX-13, "
DISASSEMBLY"in “FAX Front axle/Drive shaft
”.
Rear
1. Remove drive shaft. Refer toRAX-9, "Removal"in “RAX Rear Axle/Drive Shaft”.
2. Remove sensor rotor from drive shaft. Refer toRAX-10, "
DISASSEMBLY"in “RAX Rear axle/Drive
shaft”.
INSTALLATION
Front
1. Install sensor rotor to drive shaft. Refer toFA X -1 5 , "ASSEMBLY"in “FAX Front axle/Drive shaft”.
2. Connect drive shaft. Refer toFAX-12, "
INSTALLATION"in “FAX Front Axle/Drive Shaft”.
Rear
1. Install sensor rotor to drive shaft. Refer toRAX-12, "ASSEMBLY"in “RAX Rear axle/Drive shaft”.
2. Connect drive shaft. Refer toRAX-9, "
Installation"in “RAX Rear Axle/Drive Shaft”.

BRC-54
[ESP/TCS/ABS]
ON-VEHICLE SERVICE
ON-VEHICLE SERVICE
PFP:00000
Adjustment of Neutral Position of Steering Angle SensorEFS0019R
lAfter removing/installing or replacing the ESP/TCS/ABS control unit, steering angle sensor, steering com-
ponents, suspension components, and tires, or after adjusting the wheel alignment, make sure to adjust
the neutral position of the steering angle sensor before running the vehicle.
CAUTION:
To adjust the neutral position of the steering angle sensor, make sure to use CONSULT-II.
(Adjustment cannot be done other than CONSULT-II.)
1. Stop the vehicle with the front wheels in the straight-ahead position.
2. Connect CONSULT-II to data link connector on the vehicle, and
turn the ignition switch to ON position (engine not running).
3. Touch “START”, “ABS”, “WORK SUPPORT” and “ST ANGLE
SENSOR ADJUSTMENT” on the CONSULT-II screen in this
order.
PBIB0196E
SFIA0364E
SFIA0365E
SFIA0370E

ON-VEHICLE SERVICE
BRC-55
[ESP/TCS/ABS]
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4. Touch “START”.
CAUTION:
Do not touch the steering wheel while adjusting the steer-
ing angle sensor.
5. After approximately 10 seconds, touch “END”. (After approxi-
mately 60 seconds, it ends automatically.)
6. Turn the ignition switch OFF, then turn it ON again.
CAUTION:
Make sure to carry out the above operation.
7. Run the vehicle with the front wheels in the straight-ahead posi-
tion, then stop.
8. Select “DATA MONITOR“, “ECU INPUT SIGNALS” on the CON-
SULT-II screen. Then check that the “ST ANGLE SIG” is within
0±2.5deg. If the value is more than the specification, repeat
steps 1 to 5.
9. Erase the memory of ESP/TCS/ABS control unit and ECM.
10. Turn the ignition switch OFF.
SFIA0371E
SFIA0365E

GENERAL INFORMATION
BRC-57
[ESP/TCS/ABS]
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lWhen starting the engine, or just after starting the vehicle, the brake pedal may vibrate or the
motor operating noise may be heard from the engine compartment. This is a normal status of the
operation check.
lThe stopping distance may be longer than that of vehicles without ABS when the vehicle drives on
rough, gravel, or snowy (fresh deep snow) road.
TCS FunctionsEFS0019V
1. With the wheel speed sensor signals from 4 wheels, the ESP/TCS/ABS control unit detects a wheel spin.
If a wheel spins, the control unit controls brake fluid pressure to the spinning wheel, and cuts the fuel to
the engine. It also closes the throttle valve to reduce the engine torque. Furthermore, throttle position is
controlled to the appropriate engine torque.
2. If a wheel spins, the TCS system works same as LSD (Limited Slip Differential) function applying brake
fluid pressure to the spinning wheel.
3. During TCS operation, it informs a driver of system operation by flashing SLIP indicator lamp.
CAUTION:
lDuring TCS operation, the body and the brake pedal lightly vibrate and the mechanical noise may
be heard. This is a normal condition.
lDepending on road circumstances, the driver may have a sluggish feel. This is not abnormal,
because the optimum traction has the highest priority by TCS operation.
lWhen the vehicle is passing through a road where the surface friction coefficient varies, down-
shifting or depressing the accelerator pedal fully may activate TCS temporarily.
ESP FunctionsEFS0019W
1. The Electronic Stability Program is called the ESP for short.
The ESP is indicated as the VDC (the Vehicle Dynamics Control) on the CONSULT-II screen.
2. In addition to the ABS/TCS function, ESP detects the driver's steering operation amount and brake opera-
tion amount from the steering angle sensor and pressure sensor. Using the information from the yaw rate/
side G sensor and wheel speed sensors, ESP judges the driving condition (conditions of understeer and
oversteer) to improve the stability by controlling the brake on 4 wheels and engine output.
3. During ESP operation, the SLIP indicator lamp flashes to inform the driver of the operation.
CAUTION:
lDuring ESP operation, the body and the brake pedal lightly vibrate and their mechanical noise
may be heard. This is a normal condition.
lIf the vehicle is rotated on a turn table, or rolled and rocked on a ship, the ABS warning lamp,
ESP OFF indicator lamp, and SLIP indicator lamp may turn ON. In this case, start the engine on a
normal road again. If the ABS warning lamp, ESP OFF indicator lamp, and SLIP indicator lamp
turn OFF after the restart, it is normal.
lWhen driving in a steep slope such as a bank, the ABS warning lamp, ESP OFF indicator lamp,
and SLIP indicator lamp may turn ON. In this case, start the engine on a normal road again. If the
ABS warning lamp, ESP OFF indicator lamp, and SLIP indicator lamp turn OFF after the restart, it
is normal.

CAN COMMUNICATION
BRC-59
[ESP/TCS/ABS]
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CAN COMMUNICATIONPFP:23710
System DescriptionEFS001CN
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.
FOR M/T MODELS
System diagram
Input/output signal chart
T: Transmit R: Receive
SKIA0885E
Signals ECMSteering wheel
angle sensor4WD control unitESP/ TCS / ABS
control unit
Engine speed signal T R R
Accelerator pedal position signal T R
ESP operation signal R R T
TCS operation signal R R T
ABS operation signal R R T
Stop lamp switch signalRT
Steering wheel angle sensor signal T R
ESP-OFFSW signalRT
Wheel speed sensor signalRT
4WD Mode signalTR

TROUBLE DIAGNOSIS
BRC-71
[ESP/TCS/ABS]
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Control Unit Input/Output Signal StandardEFS001A6
STANDARDS USING A CIRCUIT TESTER AND OSCILLOSCOPE
CAUTION:
Connect the connectors for the ESP/TCS/ABS control unit and actuator, and turn the ignition switch
ON.
SFIA0363E
Measure-
ment termi-
nalMeasuring point Standard value (Note 1)(Reference) Check
items for malfunc-
tion
+–
1
Body
groundPower supply Ignition switch ON Battery voltage (Approx. 12V)
Control unit power
supply circuit
2Actuator motor relay,
actuator relay power
supply and steering
angle sensor power sup-
plyIgnition switch ON Battery voltage (Approx. 12V)
7 Actuator motor relayActuator motor being driven
(²Active test²mode with CON-
SULT-II)Approx. 0V
Actuator motor,
motor relay, and
circuit
Actuator motor while the vehicle
is stoppedBattery voltage (Approx. 12V)
36 Actuator relayWhen actuator relay is active.
(the engine running)Approx. 0V
Actuator relay and
circuit
When actuator relay is inactive.
(Fail-safe, engine starts.)Battery voltage (Approx. 12V)
20 Actuator motor monitorWhen actuator relay is active.
(the engine running)Battery voltage (Approx. 12V)
Actuator motor
monitor circuit
When actuator relay is inactive.
(Fail-safe, engine starts.)Approx. 0V

BRC-72
[ESP/TCS/ABS]
TROUBLE DIAGNOSIS
3
Body
groundFront LH wheel outlet
solenoid valve
Solenoid valve activated
(In “active test” mode of CON-
SULT-II) or actuator relay inac-
tive (in fail-safe mode)
When solenoid valve is inactive
and actuator relay active (when
ignition switch ON)Approx. 0V
Battery voltage (Approx. 12V)Solenoid valve and
circuit 4Rear RH wheel outlet
solenoid valve
5Front LH wheel inlet
solenoid valve
6Rear RH wheel inlet
solenoid valve
25Rear LH wheel outlet
solenoid valve
26Front RH wheel inlet
solenoid valve
53Rear LH wheel inlet sole-
noid valve
55Front RH wheel outlet
solenoid valve
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groundPrimary-side ESP
switch-over solenoid
valve 1 (USV)When switch-over solenoid
valve is active (in “active test”
mode of CONSULT-II)
Or, when actuator relay inactive
(when fail-safe)
When switch-over solenoid
valve is inactive and actuator
relay is active (when ignition
switch ON)Approx. 0V
Battery voltage (Approx. 12V)Switch-over sole-
noid valve and cir-
cuit 50Secondary-side ESP
switch-over solenoid
valve 1 (USV)
52Secondary-side ESP
switch-over solenoid
valve 2 (HSV)
54Primary-side ESP
switch-over solenoid
valve 2 (HSV)
810Front LH wheel speed
sensor
Wheel rotated (Approx. 30 km/h
(19 MPH) (Note 2)Pulse generation
: Approx. 200 HzWheel speed sen-
sor and circuit 11 1 2Rear RH wheel speed
sensor
13 14Rear LH wheel speed
sensor
15 16Front RH wheel speed
sensor
48Body
groundStop lamp signalDepress brake pedal. Battery voltage (Approx. 12V)
Stop lamp switch
and circuit
Release the brake pedal. Approx. 0V Measure-
ment termi-
nalMeasuring point Standard value (Note 1)(Reference) Check
items for malfunc-
tion
+–

BRC-74
[ESP/TCS/ABS]
TROUBLE DIAGNOSIS
(Note 1): When the standard value is checked using a circuit tester for voltage measurement, the connector terminals should not extend
forcefully.
(Note 2): Check the pressure of the tire in normal condition.
(Note 3): ON/OFF timing of the ABS warning lamp
ON: When the ignition switch is turned ON (before engine start) or a malfunction is detected.
OFF: 2 seconds after the engine started (the system is in normal condition).
(Note 4): ESP OFF indicator lamp ON/OFF timing
ON: When the ignition switch is turned ON (before engine start) or a malfunction is detected, if the ESP OFF switch is ON.
OFF: 2 seconds after the engine started (the system is in normal condition) and ESP OFF switch is OFF.67
Body
groundPressure sensorIgnition switch ON Approx. 0V
Pressure sensor
and circuit 68When ignition switch ON and
brake pedal released.Approx. 0.6V
69 Ignition switch ON Approx. 0V
18 Side G sensor Ignition switch ON Approx. 2.5VYaw rate /Side G
sensor and circuit
34
Yaw rate/Side G sensorIgnition switch ON Battery voltage (Approx. 12V)
Yaw rate /Side G
sensor and circuit 77 Ignition switch ON
78 Ignition switch ON Approx. 2.5V
79
Ya w r a t e s e n s o rIgnition switch ON
Ya w r a t e s e n s o r
and circuit
80 Ignition switch ON Approx. 0V
30 ABS warning lampABS warning lamp turns on
(Note 3)Approx. 0V
ABS warning lamp
and circuit
ABS warning lamp turns off
(note 3)Battery voltage (Approx. 12V)
70 ESP OFF indicator lampESP OFF indicator lamp turns
on (Note 4)Approx. 0V
ESP OFF warning
lamp and circuit
ESP OFF indicator lamp turns
off (note 4)Battery voltage (Approx. 12V)
83 SLIP indicator lampWhen SLIP indicator lamp is ON
(Note 5)Approx. 0V
SLIP indicator
lamp and circuit
SLIP indicator lamp turns off
(note 5)Battery voltage (Approx. 12V)
40 Brake fluid level warning
switchBrake fluid is not enough Battery voltage (Approx. 12V) Brake fluid level
warningswitchand
circuit
Brake fluid is enough Approx. 0V
76Body
groundParking brake signalApply the parking brake. Battery voltage (Approx. 12V)
Parking brake
switch and circuit
Release the parking brake. Approx. 0V Measure-
ment termi-
nalMeasuring point Standard value (Note 1)(Reference) Check
items for malfunc-
tion
+–
SFIA0150E
SFIA0151E