NISSAN X-TRAIL 2003 Electronic Repair Manual

PRECAUTIONS
BRC-53
[ESP/TCS/ABS]
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Precautions for CAN SystemEF S0 01 CP
FOR INSPECTION
lDo not apply voltage of 7.0V or higher to the measurement terminals.
lUse the tester with its open terminal voltage being 7.0V or less.
lBefore harness inspection, turn the ignition switch off, disconnect the negative battery terminal.
FOR HARNESS REPAIR
lSolder the repaired parts, and wrap with tape. [Frays of twisted
line must be within 110 mm (4.33 in)]
lDo not perform bypass wire connections for the repair
parts.(The spliced wire will become separated and the charac-
teristics of twisted line will be lost.)
PKIA0306E
PKIA0307E

BRC-54
[ESP/TCS/ABS]
ON-VEHICLE SERVICE
ON-VEHICLE SERVICE
PFP:00000
Adjustment of Neutral Position of Steering Angle SensorEFS0019R
lAfter removing/installing or replacing the ESP/TCS/ABS control unit, steering angle sensor, steering com-
ponents, suspension components, and tires, or after adjusting the wheel alignment, make sure to adjust
the neutral position of the steering angle sensor before running the vehicle.
CAUTION:
To adjust the neutral position of the steering angle sensor, make sure to use CONSULT-II.
(Adjustment cannot be done other than CONSULT-II.)
1. Stop the vehicle with the front wheels in the straight-ahead position.
2. Connect CONSULT-II to data link connector on the vehicle, and
turn the ignition switch to ON position (engine not running).
3. Touch “START”, “ABS”, “WORK SUPPORT” and “ST ANGLE
SENSOR ADJUSTMENT” on the CONSULT-II screen in this
order.
PBIB0196E
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ON-VEHICLE SERVICE
BRC-55
[ESP/TCS/ABS]
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4. Touch “START”.
CAUTION:
Do not touch the steering wheel while adjusting the steer-
ing angle sensor.
5. After approximately 10 seconds, touch “END”. (After approxi-
mately 60 seconds, it ends automatically.)
6. Turn the ignition switch OFF, then turn it ON again.
CAUTION:
Make sure to carry out the above operation.
7. Run the vehicle with the front wheels in the straight-ahead posi-
tion, then stop.
8. Select “DATA MONITOR“, “ECU INPUT SIGNALS” on the CON-
SULT-II screen. Then check that the “ST ANGLE SIG” is within
0±2.5deg. If the value is more than the specification, repeat
steps 1 to 5.
9. Erase the memory of ESP/TCS/ABS control unit and ECM.
10. Turn the ignition switch OFF.
SFIA0371E
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BRC-56
[ESP/TCS/ABS]
GENERAL INFORMATION
GENERAL INFORMATION
PFP:00000
Fail-SafeEFS0019S
ABS SYSTEM
If a malfunction occurs in the electrical system, the ABS warning lamp, ESP OFF indicator lamp, and SLIP
indicator lamp in the meter will turn ON. In this condition, the ESP/TCS/ABS and EBD become one of the fol-
lowing conditions by the fail-safe function.
1. Only EBD operates. The same condition as that of models without ESP/TCS/ABS
2. ESP/TCS/ABS and EBD do not operate. Only normal brake operates on 4 wheels.
NOTE:
In the step 1 shown above, the self-diagnosis is carried out at the ignition switch is turned ON and when the
vehicle initial starts. ABS self-diagnosis noise may be heard as usual.
ESP/TCS SYSTEM
If a malfunction occurs in the electrical system, the ESP OFF indicator lamp and SLIP indicator lamp in the
meter turn on. In this condition, ESP/TCS will be deactivated and it becomes equal to that of models without
ESP/TCS. However, ABS is controlled normally.
If a malfunction occurs in the throttle control system, ESP/TCS control does not operate. Only ABS control
operates normally.
CAUTION:
If the fail-safe function operates, carry out the self-diagnosis for ESP/TCS/ABS control system.
Hydraulic CircuitEFS0019T
CAUTION:
lWhen installing, check for twist and fracture.
lMake sure that there is no interference with other parts when turning the steering clockwise or
counter clockwise.
lThe brake piping is an important safety part. If a brake fluid leak is detected, always disassemble
and replace with a new one, if necessary.
ABS FunctionsEFS0019U
1. In cases of braking suddenly or braking on slippery road (ice road), ABS functions prevent wheels from
lock, improve the stability in sudden braking, and make efficient avoidance of obstacles with steering
manipulation by detecting 4-wheel speed and controlling 4-wheel brake fluid pressure.
2. EBD is integrated in ESP/TCS/ABS system.
CAUTION:
lDuring ABS operation, the brake pedal lightly vibrates and its mechanical noise may be heard.
This is a normal condition.
SFIA0346E

GENERAL INFORMATION
BRC-57
[ESP/TCS/ABS]
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lWhen starting the engine, or just after starting the vehicle, 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.
lThe stopping distance may be longer than that of vehicles without ABS when the vehicle drives on
rough, gravel, or snowy (fresh deep snow) road.
TCS FunctionsEFS0019V
1. With the wheel speed sensor signals from 4 wheels, the ESP/TCS/ABS control unit detects a wheel spin.
If a wheel spins, the control unit controls brake fluid pressure to the spinning wheel, and cuts the fuel to
the engine. It also closes the throttle valve to reduce the engine torque. Furthermore, throttle position is
controlled to the appropriate engine torque.
2. If a wheel spins, the TCS system works same as LSD (Limited Slip Differential) function applying brake
fluid pressure to the spinning wheel.
3. During TCS operation, it informs a driver of system operation by flashing SLIP indicator lamp.
CAUTION:
lDuring TCS operation, the body and the brake pedal lightly vibrate and the mechanical noise may
be heard. This is a normal condition.
lDepending on road circumstances, the driver may have a sluggish feel. This is not abnormal,
because the optimum traction has the highest priority by TCS operation.
lWhen the vehicle is passing through a road where the surface friction coefficient varies, down-
shifting or depressing the accelerator pedal fully may activate TCS temporarily.
ESP FunctionsEFS0019W
1. The Electronic Stability Program is called the ESP for short.
The ESP is indicated as the VDC (the Vehicle Dynamics Control) on the CONSULT-II screen.
2. In addition to the ABS/TCS function, ESP detects the driver's steering operation amount and brake opera-
tion amount from the steering angle sensor and pressure sensor. Using the information from the yaw rate/
side G sensor and wheel speed sensors, ESP judges the driving condition (conditions of understeer and
oversteer) to improve the stability by controlling the brake on 4 wheels and engine output.
3. During ESP operation, the SLIP indicator lamp flashes to inform the driver of the operation.
CAUTION:
lDuring ESP operation, the body and the brake pedal lightly vibrate and their mechanical noise
may be heard. This is a normal condition.
lIf the vehicle is rotated on a turn table, or rolled and rocked on a ship, the ABS warning lamp,
ESP OFF indicator lamp, and SLIP indicator lamp may turn ON. In this case, start the engine on a
normal road again. If the ABS warning lamp, ESP OFF indicator lamp, and SLIP indicator lamp
turn OFF after the restart, it is normal.
lWhen driving in a steep slope such as a bank, the ABS warning lamp, ESP OFF indicator lamp,
and SLIP indicator lamp may turn ON. In this case, start the engine on a normal road again. If the
ABS warning lamp, ESP OFF indicator lamp, and SLIP indicator lamp turn OFF after the restart, it
is normal.

BRC-58
[ESP/TCS/ABS]
GENERAL INFORMATION
System Diagram
EFS0019X
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CAN COMMUNICATION
BRC-59
[ESP/TCS/ABS]
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CAN COMMUNICATIONPFP:23710
System DescriptionEFS001CN
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.
FOR M/T MODELS
System diagram
Input/output signal chart
T: Transmit R: Receive
SKIA0885E
Signals ECMSteering wheel
angle sensor4WD control unitESP/ TCS / ABS
control unit
Engine speed signal T R R
Accelerator pedal position signal T R
ESP operation signal R R T
TCS operation signal R R T
ABS operation signal R R T
Stop lamp switch signalRT
Steering wheel angle sensor signal T R
ESP-OFFSW signalRT
Wheel speed sensor signalRT
4WD Mode signalTR

BRC-60
[ESP/TCS/ABS]
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
PFP:00004
How to Perform Trouble Diagnoses for Quick and Accurate RepairEFS001A2
INTRODUCTION
lThe most important point to perform the trouble diagnosis is to understand the systems (control and
mechanism) in the vehicle thoroughly.
lIt is also important to clarify the customer complaints before
inspection.
First of all, reproduce the symptom, and understand it fully.
Ask the customer about his/her complaints carefully. In some
cases, it will be necessary to check the symptoms by driving the
vehicle with the customer.
CAUTION:
Customers are not professional. It is dangerous to make an
easy guess like²maybe the customer means that...,²or²
maybe the customer mentions this symptom².
lIt is essential to check symptoms right from the beginning in
order to repair a malfunction completely.
For an intermittent malfunction, it is important to reproduce the
symptom based on an interview with the customer and past
examples. Do not perform an inspection on an ad hoc basis.
Most intermittent malfunctions are caused by poor contacts. In
this case, it will be effective to shake the suspected harness or
connector by hand. When repairs are performed without any
travel diagnosis, Repair work is not confirmed if it's done cor-
rectly.
lAfter the diagnosis, make sure to carry out²erase memory².
Refer toBRC-77, "
Functions of CONSULT-II".
lFor an intermittent malfunction, move the harness or harness connector by hand to check the poor con-
tact or false open circuit.
lAlways read the²GI Section²GI-3, "PRECAUTIONS"to check the general guidelines and to confirm the
general precautions.
SEF234G
SEF233G

TROUBLE DIAGNOSIS
BRC-61
[ESP/TCS/ABS]
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WORK FLOW
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BRC-62
[ESP/TCS/ABS]
TROUBLE DIAGNOSIS
ASKING COMPLAINTS
lComplaints against a malfunction vary depending on each per-
son. It is important to clarify the customer complaints.
lAsk the customer about what symptoms are present under what
conditions. Use the information to reproduce the symptom while
driving.
lIt is also important to use the diagnosis sheet to understand
what type of trouble the customer having.
EXAMPLE OF DIAGNOSIS SHEET
SBR339B
SFIA0029E