2001 NISSAN X-TRAIL ignition

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]
C
D
E
G
H
I
J
K
L
MA
B
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-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 and 2.
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 >>
●Check 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. 2.45 Ω
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]
C
D
E
G
H
I
J
K
L
MA
B
BRC
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.
4WD Mode Switch SystemEFS001CB
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 >>●4WD/ABS control unit input/output signal inspection
●Recheck 4WD/ABS control unit connector terminals and connection.
NG >> GO TO 3.
2.INSPECTION OF 4WD MODE SWITCH POWER SUPPLY
●Disconnect 4WD mode switch connector.
●Turn ignition switch ON.
●Measure voltage between 4WD mode change and over switch harness connector M39 terminal No.2 (L),
No.1 (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
●Turn ignition switch OFF.
●Confirm 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.
2 (L), 1 (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 >>
●4WD/ABS control unit input/output signal inspection
●Recheck 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 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 M46 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 (W/L) (LHD models) or 59 (W/L) (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.
46 (W/L) (LHD models) or 59 (W/L) (RHD models) - Body ground:
Battery voltage
46 (W/L) (LHD models) or 59 (RHD models) - 18:
Continuity should exist.

TROUBLE DIAGNOSIS
BRC-39
[4WD/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
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 >>
●Determine the location of the malfunction according to the result of Self-diagnosis using CON-
SULT-II. (Malfunction is present in the 4WD system.)
●CONSULT-II does not display 4WD system-related trouble codes. GO TO 2.
2.4WD CONTROL UNIT CONNECTOR CONNECTION INSPECTION
●Check 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-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.

TROUBLE DIAGNOSIS
BRC-43
[4WD/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
3.CHECK CONTINUITY BETWEEN IGNITION SWITCH AND ABS WARNING LAMP
●Disconnect 4WD/ABS control unit connector.
●Check continuity between ignition switch and 4WD/ABS control module terminal No. 4. (Open circuit
check)
Is inspection result OK?
YES >> Continuity exists. Connect 4WD/ABS control module connector, check again.
NO >> Continuity does not exist. Check ABS warning lamp path.
4.CHECK FUSE
●Check if Fuse No.8 is working normally.
Is the check result OK?
YES >> Repair or replace the harness in between 4WD/ABS control unit and IGN.
NO >> Replace the fuse and replace again.
●If the figure of the monitor is with in ± 10% of the set value of E-TS solenoid electric current, 4WD/ABS C/
U is operating normally. Check for electric control coupling ASSY is required.
4WD Warning Lamp Does Not Illuminate With Ignition ON.EFS001BR
1.INSPECTION OF BLOWN 4WD WARNING LAMP BULB
●Remove glove box on the passenger side and disconnect the 4WD/ABS control unit connector.
●Confirm continuity between 4WD/ABS control unit connector terminals No. 3 (IGN) and No. 4 (ABS warn-
ing lamp).
Is inspection result OK?
YES >> GO TO 3. (Continuity exists.)
NO >>
●Check 4WD warning lamp harness.
●Remove meter control module assembly and check for blown 4WD warning lamp bulb.
2.4WD ACTUATOR RELAY HARNESS INSPECTION
●Open the hood and check that the 4WD relay is properly installed in the relay box.
●Confirm continuity between 4WD/ABS control unit connector terminals No. 7 (4WD warning lamp) and No.
104 (ground).
●Confirm continuity between 4WD/ABS control unit connector terminals No. 3 (IGN) and No. 18 (4WD
actuator relay).
Is inspection result OK?
YES >> Continuity exists. Connect 4WD/ABS control unit connector, check again.
NO >> Check ABS warning lamp harness.
4WD Warning Lamp Does Not Go Out Several Seconds After Engine Is Started.
(Drive Mode Indicator Lamp Goes Out.)
EFS001BS
1.USING CONSULT, PERFORM SELF-DIAGNOSIS
4WD warning lamp does not go out several seconds after the engine is started. (Drive mode indicator lamp
goes out.)
Is inspection result OK?
YES >> No malfunction detected. Perform inspection again.
NO >>
●Determine the location of the malfunction according to the result of self-diagnosis using CON-
SULT. (Malfunction is present in the 4WD system.)
●CONSULT-II does not display ABS -related trouble codes. Proceed to 2.