2003 NISSAN X-TRAIL 4WD

TROUBLE DIAGNOSIS
BRC-33
[4WD/ABS]
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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 speed sensor (identified at
control unit) and the 4WD/ABS control unit connector.Check the
deformation 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 SPEED SENSOR.
Check internal resistance of wheel speed sensor.
Is inspection result OK?
YES >> GO TO 5.
NO >> Replace wheel speed sensor.
5.CHECK WHEEL SPEED SENSOR CIRCUIT.
1. Disconnect control unit connector and wheel speed sensor con-
nector.
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(BW),45 (WR),36 (OR/B) and G -sensor harness con-
nectorE59No.1(G/W),2(L/W),E17No.1(W),2(B),B126No.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.
SDIA0125E
Resistance :1.44 - 1.76 kW
SFIA0357E
SDIA0126E

BRC-34
[4WD/ABS]
TROUBLE DIAGNOSIS
Control Module Power Supply System
EFS001BM
INSPECTION PROCEDURE
Disconnect ABS actuator connector and control unit connector. Check for continuity and voltage between
each terminal of vehicle-side connector and body ground.
G -Sensor System (4WD models)EFS001BN
INSPECTION PROCEDURE
1.CONNECTOR 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 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, 109 Power supply Ignition switch ON Battery voltage
104, 106, 108, 111, 113, 115 Ground Ignition switch OFF There should be continuity.
SFIA0351E
SFIA0341E

TROUBLE DIAGNOSIS
BRC-35
[4WD/ABS]
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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 (W).
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 (B).
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 (LHD
models: R or RHD models: OR) - terminal M57 No.3 (B)
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 SYSTEMEF S0 01 CA
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-36
[4WD/ABS]
TROUBLE DIAGNOSIS
2.CONNECTOR INSPECTION
1. Disconnect the 4WD/ABS control unit connector E122 and the 4WD solenoid connector B152. Check that
terminals are not deformed. Check that the connectors were connected properly. Reconnect connectors.
2. Perform self-diagnosis again.
OK or NG
OK >> Diagnosis completed.
NG >> GO TO 3.
3.INSPECTION OF 4WD SOLENOID UNIT
1. Disconnect connector B152 and check resistance between terminals No.1 (L/W) and 2 (LG).
OK or NG
OK >> GO TO 4.
NG >> Replace 4WD solenoid.
4.INSPECTION OF 4WD SOLENOID CIRCUIT HARNESS
1. Disconnect the 4WD solenoid connector.
2. Disconnect the 4WD/ABS control unit.
3. Check the circuit continuity between control unit harness connector E122 terminal No.102 (LG) and 4WD
solenoid harness connector B152 terminal No.2 (LG).
4. Disconnect the 4WD actuator relay connector.
5. Check circuit continuity between 4WD solenoid harness connector B152 terminal No.1 (L/W) and 4WD
actuator relay connector E10 terminal No.5 (L/W)
OK or NG
OK >> GO TO 5.
NG >> Repair or replace the harness.
5.CHECK 4WD ACTUATOR RELAY AND CONNECTOR
1. Check the 4WD actuator relay and control unit harness connector.
2. Check the 4WD actuator relay unit.
OK or NG
OK >> GO TO 6.
NG >> Repair or replace 4WD actuator relay and connector.
6.CHECK 4WD ACTUATOR RELAY POWER CIRCUIT
1. Disconnect the 4WD/ABS control unit connector.
2. Turn the ignition switch ON and check voltage between the 4WD control unit harness connector E122 ter-
minal No.18 (BR/W) and body ground.
OK or NG
OK >> GO TO 7.
NG >>
lCheck items below. Perform self-diagnosis again.
–Check fuse 10 A (#8).
–Check harness and connectors between the fuse 10 A (#8), the 4WD actuator relay and the
4WD control unit. 1 - 2 :Approx. 2.45W
102 (LG) - 2 (LG) : Continuity should exist.
1 (L/W) - 5 (L/W) : Continuity should exist.
18 (BR/W) - Body ground : Battery voltage

TROUBLE DIAGNOSIS
BRC-37
[4WD/ABS]
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7.CHECK 4WD ACTUATOR RELAY GROUND CIRCUIT
1. Disconnect the 4WD actuator relay connector.
2. Check continuity between the 4WD actuator relay harness connector E10 terminal No.3 (B) and body
ground.
OK or NG
OK >> 1. Connect the connector and perform self-diagnosis again.
2. Follow self-diagnosis procedure and, at the end, be sure to drive the vehicle at 30 km/h (19
MPH) for at least 1 minute and check that the 4WD warning lamp does not turn ON.
NG >> Repair or replace harness.
4WDMODESWITCHSYSTEMEF S0 01 CB
1.INPUT SIGNAL CHECK
Check using the data monitor function of the CONSULT-II. While monitoring the 4WD mode switch items,
press 2WD mode switch. Check the display changes from ## to 2WD. Check the display for AUTO and LOCK
just the same. (## indicates when mode SW is not pressed.)
OK or NG
OK >>l4WD/ABS control unit input/output signal inspection
lRecheck 4WD/ABS control unit connector terminals and connection.
NG >> GO TO 3.
2.INSPECTION OF 4WD MODE SWITCH POWER SUPPLY
lDisconnect 4WD mode switch connector.
lTurn ignition switch ON.
lMeasure voltage between 4WD mode change and over switch harness connector M39 terminal No.26 (L),
No.27 (BR).
OK or NG
OK >> GO TO 4.
NG >> Harness malfunction or connector malfunction between ignition switch and 4WD mode switch
connector or connector malfunction.
3.HARNESS CONTINUITY INSPECTION
lTurn ignition switch OFF.
lConfirm the continuity between the following terminals.
–4WD/ABS control unit harness connector E122 terminal No. 26 (L) and 4WD mode switch harness con-
nector M39 terminal No. 2 (L)
–4WD control unit harness connector E122 terminal No. 27 (BR) and 4WD mode switch harness connector
M39 terminal No. 1 (BR)
OK or NG
OK >> GO TO 5.
NG >> Malfunctioning harness or connector.3 (B) - Body ground :Continuity should exist.
26 (L), 27 (BR) - Body ground : 4 V or more.
26 (L) - 2 (L) : Continuity should exist.
27 (BR) - 1 (BR) : Continuity should exist.

BRC-38
[4WD/ABS]
TROUBLE DIAGNOSIS
4.HARNESS CONTINUITY INSPECTION
Drive the vehicle for a while and the perform self-diagnosis.
OK or NG
OK >> End
NG >>
l4WD/ABS control unit input/output signal inspection
lRecheck 4WD control unit connector terminals and connection.
Trouble Diagnoses for SymptomsEFS001CC
4WD INDICATOR LAMP DOES NOT COME ON FOR APPROXIMATELY 1 SECOND WHEN THE
IGNITION SWITCH IS TURNED TO ON
Inspection Procedure
1.CHECK BLOWN FUSES BETWEEN IGN AND COMBINATION METER
Check that there are no blown fuses between IGN and combination meter.
OK or NG
OK >> GO TO 2.
NG >> Replace fuse and check again.
2.CHECK CONTINUITY BETWEEN COMBINATION METER AND 4WD/ABS CONTROL UNIT
1. Disconnect combination meter connector and 4WD/ABS control unit connector.
2. Check continuity between combination meter harness connector M44 terminal No.18 (Y/G) and 4WD/ABS
control unit harness C/U connector E122 terminal No.16 (Y/G).
OK or NG
OK >> GO TO 3.
NG >> Check harness between combination meter and 4WD/ABS control unit.
3.CHECK COMBINATION METER POWER CIRCUIT
1. Disconnect combination meter connector.
2. With ignition ON, check the voltage between the combination meter harness connector M44 terminal
No.46 (W/L) (LHD models) or No.59 (W/L) (RHD models) and body ground.
OK or NG
OK >> GO TO 4.
NG >> Check combination meter circuits.
4.CHECK 4WD AUTO LAMP (ON COMBINATION METER) CIRCUIT
Check continuity between combination meter terminal 46 (LHD models) or 59 (RHD models) and terminal 18.
OK or NG
OK >> Using CONSULT-II perform self-diagnosis.
NG >> Check for burned-out bulb in 4WD AUTO lamp.18 (YG) - 16 (Y/G) : Continuity should exist.
LHD models:46 (W/L), RHD models: 59 (W/L) 1(W) - Body ground:
Battery voltage
46 (LHD models) or 59 (RHD models) - 18:
Continuity should exist.

TROUBLE DIAGNOSIS
BRC-39
[4WD/ABS]
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4WD WARNING LAMP DOES NOT ILLUMINATE WITH IGNITION ON
1.INSPECTION OF BLOWN FUSE BETWEEN IGNITION SWITCH AND COMBINATION METER
Check blown fuse between ignition switch and combination meter.
OK or NG
OK >> GO TO 2 (No blown fuse)
NG >> Replace the fuse and perform the inspection again.
2.COMBINATION METER POWER SUPPLY CIRCUIT INSPECTION
1. Disconnect combination meter connector.
2. Check voltage between the combination meter harness connector M46 terminal No. LHD models: 46 (W/
L) RHD models: 59 (W/L) and body ground.
OK or NG
OK >> Malfunctioning combination meter.
NG >> Check fuse 10A [#11] to combination meter harness and connector.
4WD WARNING LAMP DOES NOT GO OUT SEVERAL SECONDS AFTER ENGINE
STARTED.(4WD MODE INDICATOR LAMP GOES OUT)
1.PERFORM SELF-DIAGNOSIS
Using CONSULT-II perform self-diagnosis.
OK or NG
OK >> No malfunction detected. Perform inspection again.
NG >>
lDetermine the location of the malfunction according to the result of Self-diagnosis using CON-
SULT-II. (Malfunction is present in the 4WD system.)
lCONSULT-II does not display 4WD system-related trouble codes. GO TO 2.
2.4WD CONTROL UNIT CONNECTOR CONNECTION INSPECTION
lCheck 4WD/ABS control unit connector for proper connection.
OK or NG
OK >> Reconnect the 4WD/ABS control unit connector properly and perform inspection again.
NG >> Repair or replace the connector.
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
1.PERFORM SELF-DIAGNOSIS.
Using CONSULT-II perform self-diagnosis.
OK or NG
OK >> GO TO 2. (No self-diagnosis malfunction indicated.)
NG >> Determine the location of the malfunction according to the result of Self-diagnosis using CON-
SULT-II. (Malfunction is present in the 4WD system.)

BRC-40
[4WD/ABS]
TROUBLE DIAGNOSIS
2.CHECK USING THE DATA MONITOR FUNCTION OF THE CONSULT- II.
lPerform inspection by the data monitor function of the CONSULT-II.
lCheck that the operation is in AUTO mode.
lMeasure voltage when the accelerator pedal is not depressed. (Accelerator pedal not depressed: Approx.
0.5V or lower)
lMeasure the current supplied to the E-TS solenoid valve. (Accelerator pedal not depressed: Approx. 0A)
OK or NG
OK >> GO TO 3. (No self-diagnosis malfunction indicated.)
NG >>
lNot in AUTO mode. GO TO 3.
lVoltage when accelerator pedal is not depressed is higher than approximately 0.5V.
l4WD solenoid valve current when the accelerator pedal is not depressed is other than 0A.
lCountermeasure: Keep the vehicle idling for approximately 15 minutes before checking again.
(Voltage when accelerator pedal is not depressed will be automatically reset to zero during this
period.)
3.INSPECTION USING 4WD MODE CHANGE-OVER SWITCH
lOn data monitor screen of the CONSULT-II, check 4WD mode switch.
lCheck if the display changes from ## to 2WD mode when the 2WD switch is pressed.
lCheck if the display changes from ## to AUTO mode when the AUTO switch is pressed.
lCheck if the display changes from ## to LOCK mode when the LOCK switch is pressed.
OK or NG
OK >> No malfunction detected.
NG >>
lNot in AUTO mode. (In 2WD or LOCK mode)
Countermeasure: Slightly depress the accelerator pedal and check that the operation mode
changes to LOCK mode.
lCheck circuit between 4WD mode switch harness connector M39 terminal No.1 (BR) and
4WD control unit harness connector E122 terminal No. 27 (BR).
(AUTO mode is not available because a malfunction is present in the 2WD mode harness.)
NOTICE:
Mechanism of 4WD mode change-over
l2WD mode: Operation changes to 2WD mode when 4WD/ABS control unit harness connector
E122 terminal No. 27 (BR) is shorted to ground.
lAUTO mode: Operation changes to AUTO mode when 4WD/ABS control unit harness connec-
tor E122 terminals No. 27 (BR) and No. 26 (L) is shorted to ground.
lLOCK mode: Operation changes to LOCK mode when 4WD/ABS control unit harness connec-
tor E122 terminal No. 26 (L) is shorted to ground.