2001 NISSAN X-TRAIL brake sensor

BRC-28
[4WD/ABS]
TROUBLE DIAGNOSIS
×: Applicable
–: Not applicableRR RH OUT SOL (ON/
OFF)–××Operating condition
(ON/OFF) of rear RH
ABS outlet solenoid
valve is displayed.
RR LH IN SOL (ON/
OFF)–××Operating condition
(ON/OFF) of rear RH
ABS inlet solenoid
valve is displayed.
RR LH OUT SOL (ON/
OFF)–××Operating condition
(ON/OFF) of rear RH
ABS outlet solenoid
valve is displayed.
E-TS SOLENOID (A) –××Current supplied to E-
TS solenoid valve
ACTUATOR RLY (ON/
OFF)–××Condition of ABS actu-
ator relay (ON/OFF) is
displayed.
MOTER RLY (ON/OFF) –××Condition of ABS motor
relay (ON/OFF) is dis-
played.
E-TS ACTUATOR –××E-TS actuator relay
ON/OFF condition
WARNING LAMP (ON/
OFF)–××Indicates ABS warning
lamp operating condi-
tion
G-SEN VOLT (V)×–×Condition of G -sensor
(ON/OFF) is displayed.
BATTERY VOLT×–×Indicates voltage sup-
plied by 4WD/ABS con-
trol unit
4WD WARNING LAMP –××Indicates 4WD warn-
ing lamp operating con-
dition
4WD MODE SW –××4WD mode recognized
by control module
4WD MODE MON –××Output condition of
drive mode indicator
lamp signal
DIS TIRE MONI (mm) –××Improper size tire
installed condition
PARK BRAKE SW
(ON/OFF)–××Indicates parking brake
switch ON/OFF condi-
tion
SPEED MTR O/P (km/
h)–××Indicates vehicle speed
recognized by meter
control unit
VOLTAGE – –×Displays values mea-
sured by voltage probe
FREQUENCY – –
×Refer to CONSULT
operation manual. Item (Unit)Monitor item selection
Remarks
Control module input
itemMain item Item menu selection

BRC-32
[4WD/ABS]
TROUBLE DIAGNOSIS
4WD SOLENOID VALVE
●Disconnect connector B152 and measure resistance between
terminals No. 1 and No. 2.
Basic InspectionEFS001BK
BASIC INSPECTION 1 BRAKE FLUID LEVEL AND LEAKAGE INSPECTION
1. Check fluid level in brake reservoir tank. If fluid level is low, refill brake fluid.
2. Check area around brake piping and ABS actuator for leaks. If a leak or oozing is detected, check as fol-
lows:
● If connections at ABS actuator are loose, tighten piping to the specified torque. Then check again for
leaks, and be sure there is no fluid leak.
● If the flare nuts at the connections and the threads of the ABS actuator are damaged, replace the dam-
aged parts. Then check again for leaks, and make sure that there is no fluid leak.
●If leak or oozing is detected except for ABS actuator connections, wipe it with clean cloth. Then check
again for leaks. If there is still leak or oozing, replace damaged part.
●If leak or oozing is detected on ABS actuator, wipe with a clean cloth. Check again for leaks, and if
there is still leak or oozing, replace ABS actuator.
CAUTION:
ABS actuator body cannot be disassembled.
BASIC INSPECTION 2 INSPECTION FOR LOOSE POWER SUPPLY TERMINAL
Check battery for looseness on battery positive/negative terminals and ground connection.
BASIC INSPECTION 3 ABS/4WD WARNING LAMP INSPECTION
1. Be sure ABS warning lamp turns on when ignition switch is turned ON. If it does not turn on, check ABS
warning lamp harness.
2. Check 4WD warning lamp illuminates with ignition switch ON. If not so, check 4WD warning lamp path.
3. Be sure ABS warning lamp turns off after approximately 1 second when ignition switch is turned ON. If it
does not turn off, perform self-diagnosis.
4. Be sure 4WD warning lamp turns off after several seconds when engine is started. If it does not turn off,
perform self-diagnosis.
5. After driving the vehicle at Approx. 30km/h (19MPH) for a few seconds, check 4WD warning lamp and
ABS warning lamp do not illuminate.
6. After completing the self-diagnosis, always erase the diagnosis memory.
Wheel Sensor SystemEFS001BL
INSPECTION PROCEDURE
1. TIRE INSPECTION
Check tire air pressure, wear, and size.
Are air pressure, wear, and size within specifications?
YES >> GO TO 2.
NO >> Adjust air pressure, or replace tire.4WD solenoid valve 1 - 2 : Approx. 2.45 Ω
SDIA0136E

BRC-60
[ESP/TCS/ABS]
GENERAL INFORMATION
●When 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.
●The 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 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 con-
trolled to the appropriate engine torque.
2. If a wheel spins, the TCS system works and function by 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:
●During TCS operation, the body and the brake pedal lightly vibrate and the mechanical noise may
be heard. This is a normal condition.
●Depending 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.
●When 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 wheel angle sensor and pressure sensor. Using the information from the
yaw rate and side G sensor and wheel sensors, ESP judges the driving condition (conditions of under-
steer 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:
●During ESP operation, the body and the brake pedal lightly vibrate and their mechanical noise
may be heard. This is a normal condition.
●If 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.
●When 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.

BRC-76
[ESP/TCS/ABS]
TROUBLE DIAGNOSIS
49
Body
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)
8 10 Front LH wheel sensor
Wheel rotated [Approx. 30 km/h
(19 MPH)] (Note 2)Pulse generation
: Approx. 200 HzWheel speed sen-
sor and circuit 11 12 Rear RH wheel sensor
13 14 Rear LH wheel sensor
15 16 Front RH wheel sensor
48Body
groundStop lamp signalDepress brake pedal. Battery voltage (Approx. 12V)
Stop lamp switch
and circuit
Release the brake pedal. Approx. 0V
44
Body
groundESP OFF switchESP OFF switch is pressed. Approx. 10V
ESP OFF switch
and circuit
ESP OFF switch is released. Approx. 12V
61CAN communication
input/output signal (H)Ignition switch ON
–
63CAN communication
input/output signal (L)Ignition switch ON Measure-
ment termi-
nalMeasuring point Standard value (Note 1)(Reference) Check
items for malfunc-
tion
+–
PBIA0224J
PBIA0223J

TROUBLE DIAGNOSIS
BRC-77
[ESP/TCS/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
(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: For approximately 0.5 seconds after the ignition switch is turned ON, or when a malfunction is detected.
OFF: Approximately 0.5 seconds after the ignition switch is turned ON (when the system is in normal operation).
(Note 4): ON/OFF timing of the ESP OFF indicator lamp
ON: For approximately 0.5 seconds after the ignition switch is turned ON, or when a malfunction is detected ESP OFF switch is ON. 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 and Side
G sensor and cir-
cuit
34
Yaw rate and Side G
sensorIgnition switch ON Battery voltage (Approx. 12V)
Yaw rate and Side
G sensor and cir-
cuit 77 Ignition switch ON
78 Ignition switch ON Approx. 2.5V
79
Yaw rate sensorIgnition 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
warning switch and
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

BRC-78
[ESP/TCS/ABS]
TROUBLE DIAGNOSIS
OFF: Approximately 0.5 seconds after the ignition switch is turned ON (when the system is in normal operation) or when ESP OFF
switch is OFF.
(Note 5): SLIP indicator lamp ON/OFF timing
ON: For approximately 0.5 seconds after the ignition switch is turned ON, or when a malfunction is detected.
OFF: Approximately 0.5 seconds after the ignition switch is turned ON (when the system is in normal operation) and ESP/TCS function
is not activated.
Flashing: ESP/TCS function is active during driving.
STANDARDS WITH CONSULT-II
CAUTION:
The displayed item is the data calculated by the control unit, so it may indicate a normal value even if
an output circuit (harness) is open or shorted.
Data monitor item ContentsData monitor
(Reference) Check items
for malfunction
ConditionReference value in
normal operation
FR RH SENSOR
FR LH SENSOR
RR RH SENSOR
RR LH SENSORWheel speed Vehicle stopped 0 [km/h (MPH)]
Wheel sensor circuit
During driving (Note 1)Almost in accor-
dance with the
speedometer dis-
play (within ±10%)
ACCEL POS SIGOpen/close condition
of throttle valve (linked
with accelerator pedal)Accelerator pedal not
depressed (ignition switch is
ON)0%Control unit communica-
tion circuit between the
ESP/TCS/ABS control
unit and ECM Accelerator pedal depressed
(ignition switch is ON)0 – 100%
ENG RPMWith the engine run-
ningWith the engine stopped 0rpm
Engine speed signal cir-
cuit
Engine runningAlmost in accor-
dance with
tachometer display
STR ANGLE SIGSteering wheel angle
detected by steering
wheel angle sensorStraight-ahead condition Approx. 0 deg
Steering wheel angle
sensor and circuit
Steering – 720 to 720deg
YAW RATE SENYaw rate detected by
yaw rate sensorVehicle stopped Approx. 0 d/s
Yaw rate sensor and cir-
cuit
During driving – 70 to 70d/s
SIDE G-SENSORTransverse accelera-
tion detected by side G
sensorVehicle stopped
Approx. 0 m/s
2
Side G sensor and circuit
During driving
– 24.3 to 24.1m/s2
PRESS SENSORBrake fluid pressure
detected by pressure
sensorWith the ignition switch
turned ON and brake pedal
released.Approx. 0 bar
Pressure sensor and cir-
cuit
With the ignition switch
turned ON and brake pedal
depressed.– 40 to 300bar
BATTERY VOLTBattery voltage sup-
plied to the ESP/TCS/
ABS control unitIgnition switch ON 10 – 16VESP/TCS/ABS control
unit power supply circuit
and ground circuit
MOTOR RELAYMotor relay
ON/OFF conditionABS not activated. OFF
Motor relay and circuit
ABS activated. ON
ACTUATOR RLYActuator relay
ON/OFF conditionIgnition ON and Vehicle
stopped.OFF
Actuator relay and circuit
Engine running and Vehicle
stopped.ON
STOP LAMP SWOperating status of
brake pedalDepress brake pedal. ON
Stop lamp switch circuit
Release the brake pedal. OFF

BRC-80
[ESP/TCS/ABS]
TROUBLE DIAGNOSIS
(Note 1): Check the pressure of the tire in normal condition.
(Note 2): ON/OFF timing of the ABS warning lamp
ON: For approximately 0.5 seconds after the ignition switch is turned ON, or when a malfunction is detected.
OFF: Approximately 0.5 seconds after the ignition switch is turned ON (when the system is in normal operation).
(Note 3): ON/OFF timing of the ESP OFF indicator lamp
ON: For approximately 0.5 seconds after the ignition switch is turned ON, or when a malfunction is detected ESP OFF switch is ON.
OFF: Approximately 0.5 seconds after the ignition switch is turned ON (when the system is in normal operation) or when ESP OFF
switch is OFF.
(Note 4): SLIP indicator lamp ON/OFF timing
ON: For approximately 0.5 seconds after the ignition switch is turned ON, or when a malfunction is detected.
OFF: Approximately 0.5 seconds after the ignition switch is turned ON (when the system is in normal operation) and ESP/TCS function
is not activated.
Flashing: ESP/TCS function is active during driving.
Functions of CONSULT-IIEFS001A7
CONSULT-II MAINLY FUNCTION APPLICATION TO ESP/TCS/ABS
×: Applicable
–: Not applicableFLUID LEV SWBrake fluid level warn-
ing switch status.W he n br ak e fl ui d l e v el w a r n in g
switch is ON.ON
Brake fluid level warning
switch, brake warning
lamp and circuit. When brake fluid lever warning
switch is OFF.OFF
EBD FAIL SIG
ABS FAIL SIG
TCS FAIL SIG
VDC FAIL SIGSystem fail signal sta-
tusMalfunctions condition
(When system failed)OFFEBD system
ABS system
TCS system
ESP system Data monitor item ContentsData monitor
(Reference) Check items
for malfunction
ConditionReference value in
normal operation
Item Self-diagnosis Data monitor Active test
Wheel sensors××–
Solenoid valves×××
Switch-over solenoid valves×××
Stop lamp switch××–
Yaw rate sensor×××
Side G sensor×××
Press sensor×××
Steering wheel angle sensor×××
Actuator relay×××
Motor relay×××
ABS warning lamp –××
Battery voltage××–
ESP/TCS/ABS C/U×––
ESP actuator motor×××
CAN communication××–
Engine speed signal –×–
ESP OFF switch –×–
ESP OFF indicator lamp –××
SLIP indicator lamp –××
Throttle angle –×–

TROUBLE DIAGNOSIS
BRC-83
[ESP/TCS/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
(note) “ACTUATOR RLY” on the CONSULT-II self-diagnosis results indicates the malfunction of the actuator motor relay and circuit.
DATA MONITOR
For details of the data monitor function, refer to the CONSULT-II Instruction Manual.
USV LINE [FL-RR]ESP switch-over solenoid valve 1 on the primary side is open cir-
cuit or shorted, or the control line is open or shorted to the power
supply or the ground.
ESP switch-over sole-
noid valve and circuit.
Refer to BRC-99
. USV LINE [FR-RL]ESP switch-over solenoid valve 1 on the secondary side is open
circuit or shorted, or the control line is open or shorted to the
power supply or the ground.
HSV LINE [FL-RR]ESP switch-over solenoid valve 2 on the primary side is open cir-
cuit or shorted, or the control line is open or shorted to the power
supply or the ground.
HSV LINE [FR-RL]ESP switch-over solenoid valve 2 on the secondary side is open
circuit or shorted, or the control line is open or shorted to the
power supply or the ground.
PUMP MOTOR
ACTUATOR RLY (note) During the actuator motor operation with ON, when the actuator
motor turns OFF. Or when the control line for actuator motor relay
is open.Actuator motor, motor
relay, and circuit. Refer
to BRC-102
During the actuator motor operation with OFF, when the actuator
motor turns ON. Or when the control line for relay is shorted to
ground.
ABS SENSOR
[ABNORMAL SIGNAL]Wheel sensor input is abnormal.Wheel sensor and cir-
cuit. Refer to BRC-92
BATTERY VOLTAGE
[ABNORMAL]ESP/TCS/ABS control unit battery voltage is too low.ESP/TCS/ABS control
unit battery voltage cir-
cuit and ground circuit.
Refer to BRC-106
ST ANGLE SEN SIGNALNeutral position correction of steering wheel angle sensor is not
finished.Neutral position adjust-
ment of steering wheel
angle sensor. Refer to
BRC-108
ST ANG SEN COM CIRCAN communication system or steering wheel angle sensor is
abnormal.Steering wheel angle
sensor and CAN com-
munication circuit. Refer
to BRC-110
SIDE G-SEN CIRCUITSide G sensor is abnormal, or the signal line of side G sensor is
open or shorted.Yaw rate and Side G
sensor and circuit. Refer
to BRC-98
EMERGENCY BRAKEESP/TCS/ABS control unit malfunction (pressure increase is too
much or too little.)ESP/TCS/ABS control
unit. Refer to BRC-108
CONTROLLER FAILURE ESP/TCS/ABS internal malfunction of control unitESP/TCS/ABS control
unit. Refer to BRC-94
CAN COMM CIRCUIT
●CAN communication line is open or shorted.
●ESP/TCS/ABS control unit internal malfunction.
●Battery voltage for EMC is interrupted instantaneously for
Approx. 0.5 seconds or more.Communication circuit
between ESP/TCS/ABS
control unit and units.
Refer to BRC-110
BR FLUID LEVEL LOWBrake fluid level drops or communication line between the ESP/
TCS/ABS control unit and the brake fluid level warning switch is
open or shorted. Communication circuit
between the ESP/TCS/
ABS control unit and the
brake fluid level warning
switch.
Reservoir tank fluid.
Refer to BRC-109
ENGINE SIGNAL 1-4, 6 Major engine components are abnormal Engine system. Refer to
BRC-94
Self-Diagnostic item Malfunction detecting condition Check route