2003 NISSAN X-TRAIL engine

BRC-4
[ABS]
PRECAUTIONS

[ABS]PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EFS004GW
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”.

Never 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.

Never 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 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 error is indicated by ABS or another warning lamp, collect all necessary information from cus-
tomer (what symptoms are present under what conditions) and check for simple causes before starting
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 or error.

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-8
[ABS]
CAN COMMUNICATION

CAN COMMUNICATIONPFP:23710
System DescriptionEFS0055R
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
CAN Communication UnitEFS0055W
×: Applicable
TYPE 1
System diagram
Body typeWagon
Axle4WD
Engine QR20DE/QR25DE QR25DE YD22DDTi QR25DE
Transmission M/T A/T M/T A/T
Brake control ABS ESP
CAN communication unit
ECM×××××
TCM××
ABS actuator and electric unit (control unit)××
ESP/TCS/ABS control unit×××
Steering angle sensor×××
4WD control unit×××××
Combination meter×××××
CAN communication typeBRC-8, "
TYPE
1"
BRC-9, "TYPE
2"BRC-55, "TYPE 3/TYPE4"BRC-56,
"TYPE 5"
PKIA6458E

CAN COMMUNICATION
BRC-9
[ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

Input/output signal chart
T: Transmit R: Receive
TYPE 2
System diagram
Input/output signal chart
T: Transmit R: Receive Signals ECMABS actuator and
electric unit
(control unit)4WD control unit Combination meter
Engine speed signal T R R
Engine coolant temperature signal T R
A/C compressor feedback signal T R
Vehicle speed signalTRR
RT
ABS warning lamp signal T R
4WD warning lamp signalTR
4WD mode indicator lamp signal T R
Parking brake switch signalRT
MI signal T R
PKIA6457E
Signals ECM TCMABS actuator
and electric unit
(control unit)4WD control
unitCombination
meter
Stop lamp switch signalRT
TR
P·N range signal R T
A/T position indicator lamp signal T R
Overdrive control switch signal R T
O/D OFF indicator signal T R
Engine speed signal T R R
Engine coolant temperature signal TR
A/C compressor feedback signal TR

TROUBLE DIAGNOSIS
BRC-27
[ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

SELF-DIAGNOSIS
Description
If an error is detected in the system, ABS warning lamp on the combination meter turn on. In this case, per-
form 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 error memory.
CAUTION:
If the error 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.

TROUBLE DIAGNOSIS
BRC-33
[ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

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-27, "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 errors may be caused by a poor connection in the harness, connector, or terminal. Move har-
nesses, 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 error×When there is an ABS actuator and elec-
tric unit error (power or ground error)
EBD error×–

BRC-34
[ABS]
TROUBLE DIAGNOSIS

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 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 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 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.

When there is fluid leaking or oozing at ABS actuator, 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 ABS actuator body.
CAUTION:
ABS actuator body cannot be disassembled.
3. Check the brake pad degree of wear. Refer to BR-27, "
PAD THICKNESS" 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-42, "
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-27, "
Operation Pro-
cedure" .

BRC-44
[ABS]
TROUBLE DIAGNOSIS

Symptom 4: ABS Does Not WorkEFS004HM
CAUTION:
ABS does not operate when speed is 10 km/h or lower.
1. CHECK ABS WARNING LAMP DISPLAY
Make sure that the warning lamp turns off approximately 1 second after the key switch is turned on or when
driving.
OK or NG
OK >> GO TO 3. Check wheel sensor and sensor rotor in BRC-42, "Symptom 1: ABS Works Frequently"
.
NG >> Perform self-diagnosis. Refer to BRC-27, "
SELF-DIAGNOSIS" .
Symptom 5: Pedal Vibration and ABS Operation NoiseEFS004HN
CAUTION:
Under the following conditions, ABS is activated and vibration is felt when brake pedal is lightly
depressed (just place a foot on it). However, this is normal.

When shifting gears

When driving on slippery road

During cornering at high speed

When passing over bumps or grooves (Approx. 50 mm or more)

When pulling away just after starting engine (Approx. 10 km/h or more)
1. SYMPTOM CHECK 1
Check if pedal vibration or operation sounds occur when the engine is started.
OK or NG
OK >> GO TO 2.
NG >> Perform self-diagnosis. Refer to BRC-27, "
SELF-DIAGNOSIS" .
2. SYMPTOM CHECK 2
Check symptoms when electrical component (headlamps, etc.) Switches are operated.
Do symptoms occur?
YES >> Check if there is a radio, antenna, antenna lead wire, or wiring close to the control unit. If there is,
move it farther away.
NG >> GO TO 3. Check wheel sensor and sensor rotor in BRC-42, "
Symptom 1: ABS Works Frequently"
.

PRECAUTIONS
BRC-49
[ESP/TCS/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

[ESP/TCS/ABS]PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EFS004H7
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 SystemEFS0019O

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

Never reuse drained brake fluid.

Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is splashed
on painted areas, wash it away with water immediately.

Never use mineral oils such as gasoline or kerosene. They will ruin rubber parts of hydraulic system.

Use a flare nut wrench when removing and installing brake
tubes.

When installing brake piping, be sure to check torque.

Before working, turn the ignition switch OFF and disconnect the
connectors for the ESP actuator and control unit or the battery
negative terminal.

Burnish the brake pad contact surfaces after refinishing or
replacing drums or rotors, after replacing pads or linings, or if a
soft pedal occurs at very low mileage. Refer to BR-31, "
BRAKE
BURNISHING PROCEDURE" .
WARNING:
Clean brakes with a vacuum dust collector to minimize risk of health hazard from powder caused
by friction.
Precautions for Brake ControlEFS0019P

During the ESP/TCS/ABS operation, the brake pedal vibrates lightly and its mechanical noise may be
heard. This is a normal condition.

Just after starting the vehicle after ignition switch ON, 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.

If a malfunction is indicated by the ABS warning lamp, or other warning lamps, collect the necessary infor-
mation from the customer (what symptoms are present under what conditions) and find out the possible
causes before starting the service. Besides the electrical system inspection, check the booster operation,
brake fluid level, and oil leaks.

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

If there is a radio, antenna, or antenna lead-in wire (including wiring) near the control unit, the ESP/TCS/
ABS function may have a malfunction or error.

If aftermarket parts (e.g. Car stereo equipment, CD player) have been installed, check harnesses for
pinches, open, and improper wiring.
SBR820BA