2005 NISSAN X-TRAIL ignition

BRC-4
[ABS]
PRECAUTIONS

[ABS]PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EFS005X6
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WARNING:

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for Brake SystemEFS004GX

Recommended fluid is brake fluid “DOT 3” or “DOT 4”.

Do not reuse drained brake fluid.

Be careful not to splash brake fluid on painted areas such as body. If brake fluid is splashed, wipe it off
and flush area with water immediately.

Do not use mineral oils such as gasoline or kerosene to clean. They will ruin rubber parts and cause
improper operation.

Using a flare nut torque wrench, securely tighten brake tube
flare nuts.

Brake system is an important safety part. If a brake fluid leak is
detected, always disassemble the affected part. If a malfunction
is detected, replace part with a new one.

Before working, turn ignition switch OFF and disconnect har-
ness connectors of ABS actuator and electric unit (control unit)
or battery cable from negative terminal.

When installing brake piping, be sure to check torque.
Precautions for Brake ControlEFS004FV

During ABS operation, brake pedal lightly vibrates and a mechanical noise may be heard. This is normal.

Just after starting vehicle after ignition switch ON, brake pedal may vibrate or motor operating noise may
be heard from engine compartment. This is a normal status of operation check.

Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.

When an malfunction is indicated by ABS or another warning lamp, collect all necessary information from
customer (what symptoms are present under what conditions) and check for simple causes before start-
ing diagnostic servicing. Besides electrical system inspection, check booster operation, brake fluid level,
and oil leaks.

If tyre size and type are used in an improper combination, or brake pads are not Genuine NISSAN parts,
stopping distance or steering stability may deteriorate.

If there is a radio, antenna, or antenna lead-in wire (including wiring) near control module, ABS function
may have a malfunction.

If aftermarket parts (car stereo, CD player, etc.) Have been installed, check for incidents such as harness
pinches, open circuits, and improper wiring.
SBR820BA

BRC-6
[ABS]
SYSTEM DESCRIPTION

SYSTEM DESCRIPTIONPFP:00000
System DiagramEFS004FZ
ABS FunctionEFS004G0

The Anti-Lock Brake System is a function that detects wheel revolution while braking, and it improves
handling stability during sudden braking by electrically preventing 4 wheel lock. Maneuverability is also
improved for avoiding obstacles.

In case of the electrical system breaks down, then the Fail-Safe function starts, the ABS becomes inoper-
ative, and the ABS warning lamp turns on.

Electrical System Diagnosis by CONSULT-II is available.
EBD FunctionEFS004G1

Electronic Brake Distributor is a function that detects subtle slippages between the front and rear wheels
during braking, and it improves handling stability by electronically controlling the Brake Fluid Pressure
which results in reduced rear wheel slippage.

In case of the electrical system break down, then the Fail-Safe function is starts, the EBD and ABS
becomes inoperative, and the ABS warning lamp is turned on.

Electrical System Diagnosis by CONSULT-II is available.
Fail-Safe FunctionEFS004G2
ABS, EBD SYSTEM
In case of the electrical problems with the ABS, the ABS warning lamp will turn on. In case of electrical prob-
lem with the EBD, ABS warning lamp will turn on. Simultaneously, the ABS become one of the following condi-
tions of the Fail-Safe function.
1. For ABS trouble, only the EBD is activated and the condition of the vehicle is the same condition of vehi-
cles without ABS equipment.
2. For EBD trouble, the EBD and ABS become inoperative, and the condition of the vehicle is the same as
the condition of vehicles without ABS, EBD equipment.
NOTE:
In condition 1 described above, an ABS self diagnosis sound may be heard. That is a normal condition
because a self diagnosis for “Ignition switch ON” and “the First Starting” are being performed.
SFIA2004E

TROUBLE DIAGNOSIS
BRC-25
[ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

Control Unit Input/Output Signal StandardEFS004GA
REFERENCE VALUE FROM CONSULT-II
CAUTION:
The display shows the control unit calculation data, so a normal value might be displayed even in the
event the output circuit (harness) is open or short - circulated.
Note 1: Confirm tyre pressure is normal.
Note 2: ABS warning lamp ON/OFF timing
ON: For approximately 1 second after the ignition switch is turned on or when an malfunction is detected.
OFF: Approximately 1 second after the ignition switch is turned on (when system is normal).Monitor item Display ContentData monitor
Reference: Inspection
checklist
ConditionReference values
for normal opera-
tion
FR LH SENSOR
FR RH SENSOR
RR LH SENSOR
RR RH SENSORWheel speed calcu-
lated using signals
from all four wheel
sensorsVehicle stopped 0 km/h (0 MPH)
BRC-36, "
Inspection 1:
Wheel Sensor System"While driving (Note 1)Nearly matches
the speedometer
display (± 10% or
less)
DOCILE G-SEN. 1
DOCILE G-SEN. 2
(4WD model)Fore-and-aft G
detected by G sensorWhen vehicle is stopped on
level groundOFF
BRC-41, "
Inspection 6: G
Sensor System"When G sensor is tilted toward
the front with G sensor mount-
ing bolt removedON
ABS IN SOL
ABS OUT SOLOperation status of all
solenoidsWhen the actuator solenoid
operates or during a fail-safeON
BRC-39, "
Inspection 4:
ABS Actuator Relay or
ABS Motor Relay Power
System"
When the actuator relay oper-
ates and the actuator solenoid
does not operateOFF
STOP LAMP SW Brake pedal operationBrake pedal depressed ON
Stop lamp switch circuit
Brake pedal not depressed OFF
MOTOR RELAYMotor and motor relay
operation statusWhen the motor relay and
motor are operatingON
BRC-39, "
Inspection 4:
ABS Actuator Relay or
ABS Motor Relay Power
System"
When the motor relay and
motor are not operatingOFF
ACTUATOR RELAYActuator relay opera-
tion statusWhen the actuator relay is
operatingOFF
When the actuator relay is not
operatingON
ABS WARN LAMPABS warning lamp on
condition (Note 2)ABS warning lamp ON ONBRC-35, "
BASIC
INSPECTION 3 ABS
WARNING LAMP"ABS warning lamp OFF OFF
BATTERY VOLTBattery voltage sup-
plied to ABS actuator
and electric unit (con-
trol unit) Ignition switch ON 10 - 16VBRC-38, "
Inspection 3:
ABS Actuator and Elec-
tric Unit (Control Unit)
Power Supply and
Ground Circuit"
EBD FAIL SIG
ABS FAIL SIGFail signal statusEBD Fail
ABS FailON
EBD system
ABS system EBD normal
ABS normalOFF
EBD SIGNAL
ABS SIGNALEBD operation
ABS operationEBD active
ABS activeON
EBD not active
ABS not activeOFF

BRC-26
[ABS]
TROUBLE DIAGNOSIS

CONSULT- II FunctionsEFS004GB
CONSULT-II MAIN FUNCTION
In a diagnosis function (main function), there are “SELF-DIAG RESULTS”, “DATA MONITOR”, “CAN DIAG
SUPPORT MNTR”, “ACTIVE TEST”, “FUNCTION TEST”, “ECU PART NUMBER”.
CONSULT-II BASIC OPERATION PROCEDURE
1. Turn ignition switch OFF.
2. Connect CONSULT-II and CONSULT-II CONVERTER to the data link connector.
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
3. Turn ignition switch ON.
4. Touch “START (NISSAN BASED VHCL)”.
5. Touch “ABS” in the “SELECT SYSTEM” screen.
If “ABS” is not indicated, go to GI-35, "
CONSULT-II Data Link
Connector (DLC) Circuit" .
Diagnostic
test modeFunction Reference
SELF-DIAG
RESULTSSelf-diagnostic results can be read and erased quickly.BRC-28, "
SELF-DIAGNOSIS"
DATA MONI-
TORInput/Output data in the ABS actuator and electric unit (control unit) can be read.BRC-30, "DATA MONITOR"
CAN DIAG
SUPPORT
MNTRThe results of transmit/receive diagnosis of communication can be read. —
ACTIVE TESTDiagnostic Test Mode in which CONSULT-II drives some actuators apart from the
ABS actuator and electric unit (control unit) and also shifts some parameters in a
specified range.BRC-32, "
ACTIVE TEST"
FUNCTION
TESTConducted by CONSULT-II instead of a technician to determine whether each sys-
tem is “OK” or “NG”.—
ECU PART
NUMBERABS actuator and electric unit (control unit) part number can be read. —
SKIA3098E
SFIA1816E

BRC-28
[ABS]
TROUBLE DIAGNOSIS

SELF-DIAGNOSIS
Description
If an malfunction is detected in the system, ABS warning lamp on the combination meter turn on. In this case,
perform self-diagnosis as follows:
Operation Procedure
1. Turn ignition switch OFF.
2. Connect CONSULT-II and CONSULT-II CONVERTER to the data link connector.
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
3. Turn ignition switch ON.
4. Start engine and drive at 30 km/h (19 MPH) or more for approximately 1 minute.
5. After stopping the vehicle, with the engine running, touch “START (NISSAN BASED VHCL)”, “ABS”,
“SELF-DIAG RESULTS” in order on the CONSULT-II screen.
CAUTION:
If “START (NISSAN BASED VHCL)” is touched immediately after starting the engine or turning on
the ignition switch, “ABS” might not be displayed in the System Selection screen. In this case,
repeat the operation from step 1.
6. The self-diagnostic results are displayed. (If necessary, the self-diagnostic results can be printed out by
touching “PRINT”.)

When “NO FAILURE” is displayed, check the ABS warning lamp.
7. Conduct the appropriate inspection from the display item list, and repair or replace the malfunctioning
component.
8. Start engine and drive at 30 km/h (19 MPH) or more for approximately 1 minute.
CAUTION:

When a wheel sensor “short-circuit” is detected, if the vehicle is not driven at 30 km/h (19 MPH)
for at least 1 minute, the ABS warning lamp will not turn off even if everything is normal.
9. Turn ignition switch OFF to prepare for erasing the memory.
10. Start the engine and touch “START (NISSAN BASED VHCL)”, “ABS”, “SELF-DIAG RESULTS”, “ERASE
MEMORY” in order on the CONSULT-II screen to erase the diagnostic memory.
CAUTION:
If the diagnostic memory is not erased, re-conduct the operation from step 4.
11. For the final inspection, drive at 30 km/h (19 MPH) or more for approximately 1 minute and confirm that
the ABS warning lamp a off.

BRC-30
[ABS]
TROUBLE DIAGNOSIS

Note 1: After completing repairs of shorted sensor circuit, when ignition switch is turned ON, ABS warning
lamp turns on. Check that ABS warning lamp turns off while driving vehicle at 30 km/h (19 MPH) or more for
approximately 1 minute according to self-diagnosis procedure. In addition, if wheel sensor 2 is displayed for
wheels, check wheel sensor circuit and also check control unit power voltage.
Note 2: When malfunctions are detected in several systems, including CAN communication system [U1000],
troubleshoot CAN communication system.
DATA MONITOR
Operation Procedure
1. Touch “ABS”, “DATA MONITOR” in order on the CONSULT-II screen.
2. Return to the Monitor Item Selection screen, and touch “ECU INPUT SIGNALS”, “MAIN SIGNALS” or
“SELECTION FROM MENU”. Refer to the following information.
3. When “START” is touched, the data monitor screen is displayed.
Display Item List
CAN COMM CIRCUIT When there is an malfunction in the CAN communication system.
BRC-43, "Inspection 7:
CAN Communication
System" (Note 2)
PUMP MOTOR During actuator motor operation with ON, when actuator motor
turns OFF or when control line for actuator motor relay is open.BRC-39, "
Inspection 4:
ABS Actuator Relay or
ABS Motor Relay Power
System"
G - SENSOR
(4WD model)Decel G-sensor is malfunctioning, or signal line of Decel G-sen-
sor is open or shorted. BRC-41, "Inspection 6:
G Sensor System"
Suspect Systems Malfunction detecting condition Inspection system
Item (Unit)SELECT MONITOR ITEM
Remarks
ECU INPUT
SIGNALSMAIN SIGNALSSELECTION
FROM MENU
FR LH SENSOR
[km/h]×××Wheel speed calculated by front
LH wheel sensor signal is dis-
played.
FR RH SENSOR
[(km/h]×××Wheel speed calculated by front
RH wheel sensor signal is dis-
played.
RR LH SENSOR
[km/h]×××Wheel speed calculated by Rear
LH wheel sensor signal is dis-
played.
RR RH SENSOR
[km/h]×××Wheel speed calculated by Rear
RH wheel sensor signal is dis-
played.
DECEL G-SEN 1
(ON/OFF) (4WD model)×××Decel G-sensor 1 (ON/OFF) status
is displayed.
DECEL G-SEN 2
(ON/OFF) (4WD model)×××Decel G-sensor 2 (ON/OFF) status
is displayed.
FR LH IN SOL
(ON/OFF)–××Front left inlet ABS solenoid valve
(ON/OFF) status is displayed.
FR LH OUT SOL
(ON/OFF)–××Front left outlet ABS solenoid
valve (ON/OFF) status is dis-
played.
RR RH IN SOL
(ON/OFF)–××Rear right inlet ABS solenoid valve
(ON/OFF) status is displayed.
RR RH OUT SOL
(ON/OFF)–××Rear right outlet ABS solenoid
valve (ON/OFF) status is dis-
played.

BRC-34
[ABS]
TROUBLE DIAGNOSIS

Correct and Quick DiagnosisEFS004GC
DIAGNOSIS PRECAUTIONS

Before performing the trouble diagnosis, always read the general information (GI) to confirm the general
precautions. Refer to GI-4, "
General Precautions" .

After completing service, always erase the self-diagnosis results. Refer to BRC-28, "Operation Proce-
dure" .

When inspection of the continuity or voltage between units is performed, check connector terminals for
disconnection, looseness, bend, or collapse. If any non-standard condition is detected, repair or replace
applicable part.

Intermittent malfunctions may be caused by a poor connection in the harness, connector, or terminal.
Move harnesses, harness connectors, or terminals by hand to make sure all connections are solid and
undamaged.

If a circuit tester is used for the check, be careful not to forcibly extend any connector terminal.

While a phenomena like those shown in the following table may occur, this is not malfunction because the
system is working normally.
ON and OFF Timing for ABS Warning Lamp
×: ON –: OFF Symptom Symptom description Result
Motor operation noiseThis is the sound of the motor operating inside ABS actuator, and there
may be some low sounds while the ABS is operating.
Normal
Just after the engine starts, the motor operating noise may be heard.
This is a normal status of the system operation check.
System operation check
noiseWhen the engine is started, you may barely be able to hear a slight
thudding sound from the engine room, but this sound is made by the
system operation check and is normal.Normal
ABS operation (longer stop-
ping distance)Stopping distance may be longer for vehicles with ABS when the vehicle
drives on rough or snow-covered roads. Use lower speeds when driving
on these kinds of roads.Normal
Condition ABS warning lamp Remarks
Ignition switch OFF – —
For approximately “1” second after igni-
tion switch ON×—
After approximately “1” second after igni-
tion switch ON. (When system is normal)– Turns off 1 second after engine start
ABS malfunction×When there is an ABS actuator and elec-
tric unit malfunction (power or ground
malfunction)
EBD malfunction×–

TROUBLE DIAGNOSIS
BRC-35
[ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

Basic InspectionEFS004GD
BASIC INSPECTION 1 BRAKE FLUID AMOUNT, LEAKS, AND BRAKE PADS INSPECTION
1. Check fluid level in the brake reservoir tank. If fluid level is low, refill the brake fluid.
2. Check the brake piping and around the ABS actuator for leaks. If there is leaking or oozing fluid, check the
following items.

If ABS actuator and electric unit (control unit) connection is loose, tighten the piping to the specified
torque and re-conduct the leak inspection to make sure there are no leaks.

If there is damage to the connection flare nut or ABS actuator and electric unit (control unit) screw,
replace the damaged part and re-conduct the leak inspection to make sure there are no leaks.

When there is fluid leaking or oozing from a part other than ABS actuator and electric unit (control unit)
connection, if the fluid is just oozing out, use a clean cloth to wipe off the oozing fluid and re-check for
leaks. If fluid is still oozing out, replace the damaged part.
CAUTION:
ABS actuator and electric unit (control unit) cannot be disassembled.
3. Check the brake pad degree of wear. Refer to BR-27, "
PA D T H I C K N E S S" in “Front Disc Brake” and BR-
32, "PAD WEAR INSPECTION" in “Rear Disc Brake”.
BASIC INSPECTION 2 POWER SYSTEM TERMINAL LOOSENESS AND BATTERY INSPECTION
Make sure the battery positive cable, negative cable and ground connection are not loose. In addition, check
the battery voltage to make sure it has not dropped.
BASIC INSPECTION 3 ABS WARNING LAMP
1. Make sure that when the ignition switch is turned ON, the ABS warning lamp turns on for approximately 1
second. If they do not turn on, perform CAN communication system diagnosis. Refer to BRC-43, "
Inspec-
tion 7: CAN Communication System" .
2. Check if the ABS warning lamp turns off approximately 1 second after the ignition switch is turned ON, If it
do not turn off, perform self-diagnosis.
3. if ABS warning lamp has not turned off 10 seconds after the engine has been started, perform self-diagno-
sis of the ABS actuator and electric unit (control unit).
4. Always erase the self-diagnostic results after completing self-diagnosis. Refer to BRC-28, "
Operation Pro-
cedure" .