NISSAN X-TRAIL 2003 Service Repair Manual

SYSTEM DESCRIPTION
BRC-7
[ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

Hydraulic Circuit DiagramEFS004G3
SFIA2173E

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

BRC-10
[ABS]
CAN COMMUNICATION

Vehicle speed signalTRR
RT
ABS warning lamp signal T R
4WD warning lamp signalTR
4WD mode indicator lamp signalTR
Parking brake switch signalRT
MI signal TR Signals ECM TCMABS actuator
and electric unit
(control unit)4WD control
unitCombination
meter

TROUBLE DIAGNOSIS
BRC-11
[ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

TROUBLE DIAGNOSISPFP:00004
How to Proceed With DiagnosisEFS004G6
BASIC CONCEPT

Most important point to perform diagnosis is to understand systems (control and mechanism) in vehicle
thoroughly.

It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptom, and understand it fully.
Ask customer about his/her complaints carefully. In some cases,
it will be necessary to check symptom by driving vehicle with
customer.
NOTE:
Customers are not professionals. Do not assume “maybe cus-
tomer means...” or “maybe customer mentioned this symptom”.

It is essential to check symptoms right from beginning in order to
repair a malfunction completely.
For an intermittent malfunction, it is important to reproduce
symptom based on interview with customer and past examples.
Do not perform inspection on ad hoc basis. Most intermittent
malfunctions are caused by poor contacts. In this case, it will be
effective to shake suspected harness or connector by hand.
When repairs are performed without any symptom check, no
one can judge if malfunction has actually been eliminated.

After diagnosis, make sure to carry out “erase memory”. Refer to
BRC-27, "
Operation Procedure" .

Always read “GI General Information” to confirm general precau-
tions. Refer to GI-4, "
General Precautions" .
EFJ0028D
SEF233G

BRC-12
[ABS]
TROUBLE DIAGNOSIS

DIAGNOSIS FLOWCHART
SFIA0953E

TROUBLE DIAGNOSIS
BRC-13
[ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

ASKING COMPLAINTS

Complaints against malfunction vary depending on each person.
It is important to clarify customer complaints.

Ask customer about what symptoms are present and under
what conditions. Use information to reproduce symptom while
driving.

It is also important to use diagnosis sheet so as not to miss infor-
mation.
EXAMPLE OF DIAGNOSIS SHEET
SBR339B
SFIA0791E

BRC-14
[ABS]
TROUBLE DIAGNOSIS

Component Parts LocationEFS004G7
SFIA2201E

TROUBLE DIAGNOSIS
BRC-15
[ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC

Schematic EFS004G8
TFWA0078E

BRC-16
[ABS]
TROUBLE DIAGNOSIS

Wiring Diagram — ABS —EFS004G9
TFWA0079E