2001 NISSAN X-TRAIL sensor

BRC-26
[4WD/ABS]
TROUBLE DIAGNOSIS
(Note 1): When vehicle was stuck on slippery road, and spin its wheels for Approx. 10 - 80 seconds (the period depends on vehicle
speed). ABS warning lamp may come on. However, this is not malfunction.
(Note 2): Repair short circuit in sensor. ABS warning lamp will come on when ignition switch is turned ON. According to self-diagnosis
operation procedure, drive vehicle at Approx. 30 km/m (19 MPH). Then check ABS warning lamp goes out in about one minute.
CAUTION:
If “ALL MODE 4WD” is not displayed on system selection screen, check the following: 4WD actuator and control unit, data link
connector harness, and No. Of CONSULT-II program card
DATA MONITOR
●For details of data monitor function, refer to CONSULT -II Instruction Manual.
Operation Procedure
1. Turn the ignition switch to OFF.
2. Connect CONSULT-II connector to data link connector on vehicle.
3. Turn ignition switch ON.
4. Touch “START” on the display.
5. Touch “ALL MODE 4WD” on display.
CAUTION:
“ALL MODE 4WD” may not be displayed on the system selection screen in the following case:
When “START” was touched just after engine is started or ignition switch is turned to ON. In this
case, repeat procedure from step 2.
6. Touch “DATA MONITOR”.
ABS actuator relay [ON error] ABS actuator relay turned ON wheel it is controlled OFF.
ABS actuator relay and
harness ABS ACTUATOR RELAY
[OFF malfunction]ABS actuator relay turned OFF wheel it is controlled ON.
BATTERY VOLTAGE [VB-HIGH] 4WD control module power voltage is excessively high.
Control unit power sup-
ply circuit
BATTERY VOLTAGE [VB-LOW] 4WD control module power voltage is excessively low.
DECEL G-SENSOR Longitudinal G -sensor output voltage is outside specification.
G -sensor harness
G-SENSOR VOLTAGEPower voltage of longitudinal G -sensor remains irregularly high
or low for a certain period of time.
ETS SOLENOID
(4WD solenoid valve) (OPEN)4WD solenoid valve control terminal is not supplied with proper
voltage due to open circuit in 4WD solenoid valve.
4WD actuator relay,
solenoid, and harness ETS SOLENOID
(4WD solenoid valve) (Short)4WD solenoid valve control terminal is not supplied with proper
voltage due to short circuit in 4WD solenoid valve.
ETS SOLENOID
(4WD solenoid valve)
(CURRENT FAILURE)Current supplied to 4WD solenoid valve is irregularly high or low
compared with the specification.
CONTROL UNIT Processing function of 4WD/ABS control unit is malfunctioning.4WD/ABS control unit,
power and ground cir-
cuits
DECEL G-SEN MONI Output voltage of longitudinal G -sensor is outside specification G -sensor harness
DECEL G-SEN IN Output voltage of longitudinal G -sensor is outside specification G -sensor harness
3 V POWER SUPPLY CHECK4WD/ABS control unit internal 3V power supply is malfunction-
ingControl unit power sup-
ply circuit
4WD A/R CHECK 4WD actuator relay turned ON while it is controlled OFF.
4WD actuator relay,
4WD solenoid and har-
ness. 4WD SOL/V CHECK4WD solenoid not supplied with proper voltage due to open cir-
cuit in 4WD solenoid valve.
CAN COMM
●CAN communication function of 4WD control units is not mal-
functioning.
●CAN communication function of EPS control unit, ECM is mal-
functioning.CAN communication
system of 4WD control
unit.
ABS 4WD COMM4WD/ABS control unit internal 3V power supply is malfunction-
ingEPS control unit
and harness Faulty lines Malfunction detecting condition Check harness

TROUBLE DIAGNOSIS
BRC-27
[4WD/ABS]
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B
BRC
7. Return to monitor item selection screen. Touch any of “ECU INPUT SIGNALS”, “MAIN SIGNALS”,
“CAN DIG SUPPORT MINTR” or “SELECTION FROM MENU”.
Refer to following “Data monitor item chart”.
8. Touch “MONITOR START”.
9. Screen of data monitor is displayed.
Display Item List
Item (Unit)Monitor item selection
Remarks
Control module input
itemMain item Item menu selection
FR RH SENSOR (km/
h)×××Wheel speed calcu-
lated by front RH wheel
sensor signal is dis-
played.
FR LH SENSOR (km/h)×××Wheel speed calcu-
lated by front LH wheel
sensor signal is dis-
played.
RR RH SENSOR (km/
h)×××Wheel speed calcu-
lated by rear RH wheel
sensor signal is dis-
played.
RR LH SENSOR (km/
h)×××Wheel speed calcu-
lated by rear LH wheel
sensor signal is dis-
played.
DECEL G-SENSOR×××Condition of G -sensor
is displayed.
THRTL POS SEN×××Indicates throttle posi-
tion sensor signal volt-
age
STOP LAMP SW×××Operating condition of
ABS warning lamp by
control unit is dis-
played.
ENGINE SPEED SIG
(STOP/RUN)×××Condition of stop lamp
switch (ON/OFF) is dis-
played.
FR RH IN SOL –××Operating condition
(ON/OFF) of rear RH
ABS inlet solenoid
valve is displayed.
FR RH OUT SOL –××Operating condition
(ON/OFF) of rear RH
ABS outlet solenoid
valve is displayed.
FR LH IN SOL –××Operating condition
(ON/OFF) of rear RH
ABS inlet solenoid
valve is displayed.
FR LH OUT SOL (ON/
OFF)–××Operating condition
(ON/OFF) of rear RH
ABS outlet solenoid
valve is displayed.
RR RH IN SOL (ON/
OFF)–××Operating condition
(ON/OFF) of rear RH
ABS inlet solenoid
valve is displayed.

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

TROUBLE DIAGNOSIS
BRC-33
[4WD/ABS]
C
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B
BRC
2.SENSOR ROTOR INSPECTION
Check sensor rotor tooth for damage.
Is inspection result OK?
YES >> GO TO 3.
NO >> Replace sensor rotor.
3.CHECK THE CONNECTOR
1. Remove both the malfunctioning wheel sensor (identified at con-
trol unit) and the 4WD/ABS control unit connector. Check the defor-
mation of the terminal or if the connection is at the incomplete state.
Then connect the connectors.
2.Operate self-diagnosis.
Does ABS warning lamp illuminate?
YES >> GO TO 4
NO >> Check is completed.
4.CHECK WHEEL SENSOR.
Check internal resistance of wheel sensor.
Is inspection result OK?
YES >> GO TO 5.
NO >> Replace wheel speed sensor.
5.CHECK WHEEL SENSOR CIRCUIT.
1. Disconnect control unit connector and wheel sensor connector.
2. Check continuity between the 4WD/ABS control unit harness
connector E122 terminal N0.43 (G/W), 34 (L/W), 37 (W), 46 (B),
35 (L), 44 (B/W), 45 (W/R), 36 (OR/B) and wheel sensor har-
ness connector E59 No.1 (G/W), 2 (L/W), E17 No.1 (W), 2 (B),
B126 No.1 (L), 2 (B/W), B130 No.1 (W/R), 2(OR/B)
Is inspection result OK?
YES >> Replace 4WD/ABS control unit.
NO >> Repair or replace the harness.
SFIA0932E
Resistance : 1.44 - 1.76 kΩ
SFIA0357E
SFIA0470E

BRC-34
[4WD/ABS]
TROUBLE DIAGNOSIS
Control Unit Power Supply System
EFS001BM
INSPECTION PROCEDURE
Disconnect control unit connector. Check for continuity and voltage between each terminal of vehicle-side con-
nector and body ground.
G -Sensor System (4WD models)EFS001BN
INSPECTION PROCEDURE
1. CONNECTOR INSPECTOR INSPECTION
1. Disconnect control unit connector and G sensor connector. Check control module connector terminal for
deformation and poor connection. Reconnect connector.
2. Perform the self-diagnosis.
Dose warning lamp illuminate?
YES >> GO TO 2.
NO >> Diagnosis completed
2. G -SENSOR OR HARNESS INSPECTION
1. Disconnect G -sensor connector.
2. Disconnect control unit connector.
3. Check harness between control unit and G sensor.
Is inspection result OK?
YES >> GO TO 3.
NO >> Repair or replace the harness.
Terminal No. Signal name Measuring condition Measurement value
3 (G/R), 109 (G/R) Power supply Ignition switch ON Battery voltage
104 (B), 106 (B), 108 (B), 11 (B),
113 (B), 115 (B)Ground Ignition switch OFF There should be continuity.
SFIA0469E
SFIA0468E

TROUBLE DIAGNOSIS
BRC-35
[4WD/ABS]
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BRC
3.G -SENSOR CIRCUIT CONNECTOR INSPECTION
1. Disconnect connectors and remove G -sensor from vehicle.
2. Check the voltage under following condition with ignition switch
ON: G sensor harness-side connector terminal M57 No.1 (W) -
Body ground
Is inspection result OK?
YES >> GO TO 4.
NO >> Replace 4WD/ABS control unit.
4.G -SENSOR UNIT INSPECTION
1. Using a test harness, connect 8.0V from the G -sensor harness
connector terminal M57 No.1 (W) to the G -sensor connector
terminal M57 No.1.
2. Using a test harness, connect a ground from the G -sensor har-
ness connector terminal M57 No.3 (B) to the G -sensor connec-
tor terminal M57 No. 3.
3. With ignition switch ON, when the G sensor is in horizontal,
check the output voltage under following condition with tilted for-
ward and backward by 90° and 0°: terminal M57 No.2 - terminal
M57 No.3.
4. After inspection, install the G sensor. Erase diagnosis trouble code of the 4WD/ABS control unit.
Is inspection result OK?
YES >> GO TO 5.
NO >> Replace G -sensor.
5.WARNING LAMP DISPLAY CODE INSPECTION
1. Connect the connector and perform self-diagnosis again.
2. Follow self-diagnosis procedure. After diagnosis, be sure to drive the vehicle at 30 km/m (19 MPH) for 1
minute or longer and be sure that the ABS warning lamp does not come on.
>> Diagnosis completed
4WD Solenoid, Actuator Relay SystemEFS001CA
Checking procedure
1.INSPECTION START
Use CONSULT-II and perform self-diagnosis.
OK or NG
OK >> Drive at 30 km/h (19 MPH) for at least 1 minute. Check that 4WD warning lamp does not turn ON.
NG >> GO TO 2.No.1 - Body ground : Approx. 8.0 V
SDIA0631E
No. 2 to No. 3 output voltage (V)
Horizontal : 2.3 - 2.7
Tilted forward by 90°: 0.80 - 0.86
Tilted rearward by 90°: 3.87 - 4.47SDIA0632E

BRC-42
[4WD/ABS]
TROUBLE DIAGNOSIS
Using active test mode of CONSULT-II, supply current to the 4WD solenoid valve and check that the mon-
itor current becomes close to this supply current.
●The 4WDcontrol unit is normal when the difference between 4WD solenoid valve current and the monitor
current is within ±10%.
It is necessary to inspect the electronically controlled coupling assembly.
TIGHT-CORNER BRAKING SYMPTOM OCCURS WHEN THE VEHICLE IS STARTED IN AUTO
WARNING LAMP REMAIN OFF).
1. THROTTLE POSITION SENSOR AND HARNESS INSPECTION
Check accelerator pedal stroke.
OK or NG
OK >> Perform self-diagnosis again.
NG >> Malfunctioning throttle position sensor harness
4WD ACTUATOR RELAY (4WD SOLENOID ACTUATOR RELAY) TURNS ON/OFF FREQUENTLY
1. SELF-DIAGNOSIS RESULT IS 4WD ACTUATOR RELAY (4WD SOLENOID ACTUATOR RELAY) ON
ERROR AND OFF ERROR
Is self-diagnosis result [ON error and OFF error]?
OK or NG
OK >> GO TO 2.
NG >> Repair or replace as necessary.
2. 4WD ACTUATOR RELAY (4WD SOLENOID ACTUATOR RELAY) AND HARNESS INSPECTION
Is self-diagnosis result [ON error and OFF error]?
OK or NG
OK >> Perform self-diagnosis again.
NG >> Malfunctioning 4WD actuator relay (4WD solenoid actuator relay) harness
ABS Warning Lamp Does Not Illuminate. (ABS Warning Lamp Does Not Come
On When The Ignition Switch Is Turned ON.)
EFS001BP
●Replace the combination meter control unit.
ABS Warning Lamp Illuminates With Ignition ON, But Does Not Illuminates After
A Few Seconds. (ABS Warning Lamp Has Illuminated.)
EFS001BQ
1. 4WD/ABS CONTROL MODULE CONNECTOR CONNECTION INSPECTION
●Remove glove box on the passenger side and check 4WD/ABS control module connector for proper con-
nection.
Is inspection result OK?
YES >> Proceed to 2. (4WD/ABS control unit connector is properly connected.)
NO >>
●Connect the 4WD/ABS control unit connector and perform inspection again.
2. USING CONSULT, PERFORM SELF-DIAGNOSIS
●Connect the CONSULT-II and perform self-diagnosis.
Is inspection result OK?
YES >> GO TO 3. (No self-diagnosis malfunction indicated.)
NO >> Perform inspection according to the trouble codes displayed on the CONSULT-II. Refer to the
“DTC chart”. Example) Monitor value becomes Approx. 1 A for 4WD solenoid current 1 A setting.