Page 873 of 3066
PREPARATION
BRC-5
[4WD/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
PREPARATIONPFP:00002
Special Service ToolsEFS001B8
Tool name Description
Electronic system diagnosis tester
CONSULT-II
EG1187 0000
Program card for diagnosis
EG1187 0100Checking and diagnosing the system
1Flarenutcrowfoot
2 Torque wrenchRemoving and installing each brake
piping
a:10mm (0.39 in)
Brake fluid pressure gauge Measuring brake fluid pressure
ZZA1207D
S-NT360
S-NT151
Page 874 of 3066
![NISSAN X-TRAIL 2003 Electronic Repair Manual BRC-6
[4WD/ABS]
ALL MODE 4X4 SYSTEM
ALL MODE 4X4 SYSTEM
PFP:47850
System DescriptionEFS001CJ
ABS FUNCTION
lDuring ABS operation, brake pedal lightly vibrates and its mechanical noise may be heard. Thi NISSAN X-TRAIL 2003 Electronic Repair Manual BRC-6
[4WD/ABS]
ALL MODE 4X4 SYSTEM
ALL MODE 4X4 SYSTEM
PFP:47850
System DescriptionEFS001CJ
ABS FUNCTION
lDuring ABS operation, brake pedal lightly vibrates and its mechanical noise may be heard. Thi](/manual-img/5/57402/w960_57402-873.png)
BRC-6
[4WD/ABS]
ALL MODE 4X4 SYSTEM
ALL MODE 4X4 SYSTEM
PFP:47850
System DescriptionEFS001CJ
ABS FUNCTION
lDuring ABS operation, brake pedal lightly vibrates and its mechanical noise may be heard. This is a nor-
mal condition.
lWhen starting engine, or just after starting vehicle, brake pedal may vibrate. Also motor operating noise
may be heard from engine compartment. This is a normal status of operation check.
lWhen vehicle drives on rough, gravel, or snowy (fresh deep snow) road, the following conditions occur.
Stopping distance may be longer than that of vehicles without ABS.
4WD FUNCTION
lElectronically controlled 4WD is controlled by the same control module as that for ABS (4WD/ABS control
unit). 4WD/ABS control unit controls both electronically-controlled 4WD and ABS, based on input signals
from several sensors.
lIf electrical system-related malfunction occurred in 4WD/ABS system, control unit illuminates the following
lamps: 4WD warning lamp and/or ABS warning lamp on meter control unit assembly. This notifies driver of
malfunction. At the same time, control unit indicates malfunctioning part detected by self-diagnosis with
flashing pattern of LED. Indication on electronic system diagnosis tester (CONSULT) corresponds to this
flashing pattern as shown below.
Control System DiagramEFS001CK
Self-diagnostic test mode Remarks
Result of self-diagnosis Conformable to 4WD/ABS
Data monitor Conformable to 4WD/ABS
Active testChecks ABS solenoid valve ON/OFF, ABS motor ON/OFF, 4WD sole-
noid
Control unit part No. 4WD/ABS control unit
SFIA0350E
Page 875 of 3066
![NISSAN X-TRAIL 2003 Electronic Repair Manual TROUBLE DIAGNOSIS
BRC-7
[4WD/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
TROUBLE DIAGNOSISPFP:00004
Fail-safe FunctionEFS001BB
lIf a malfunction occurs in 4WD/ABS electrical system, and control unit detects the m NISSAN X-TRAIL 2003 Electronic Repair Manual TROUBLE DIAGNOSIS
BRC-7
[4WD/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
TROUBLE DIAGNOSISPFP:00004
Fail-safe FunctionEFS001BB
lIf a malfunction occurs in 4WD/ABS electrical system, and control unit detects the m](/manual-img/5/57402/w960_57402-874.png)
TROUBLE DIAGNOSIS
BRC-7
[4WD/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
TROUBLE DIAGNOSISPFP:00004
Fail-safe FunctionEFS001BB
lIf a malfunction occurs in 4WD/ABS electrical system, and control unit detects the malfunction, 4WD
warning light on gauge turns ON to inform driver of system malfunction.
lWhen 4WD and ABS warning lamp is ON, vehicle is in 2WD.
How to Proceed with Trouble DiagnosisEFS001BC
BASIC CONCEPT
lThe most important point to perform trouble diagnosis is to understand vehicle systems (control and
mechanism) thoroughly.
lIt 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 symptoms by driving vehicle with
customer.
CAUTION:
Customers are not professional. It is dangerous to make an
easy guess like “maybe the customer means that...,” or
“maybe the customer mentions this symptom”.
lIt is essential to check symptoms right from the beginning in
order to repair a malfunction completely.
For intermittent malfunction, reproduce symptom based on inter-
view with customer and past examples. Do not perform inspec-
tion on ad hoc basis. Most intermittent malfunctions are caused
by poor contacts. In this case, it will be effective to shake sus-
pected harness or connector by hand. When repairing without
any symptom diagnosis, you can not judge if malfunction has
actually been eliminated.
lAfter completing diagnosis, always erase diagnostic memory.
Refer toBRC-23, "
CONSULT-II Functions".
lFor intermittent malfunction, move harness or harness connector by hand. Then check poor contact or
false open circuit.
lAlways read “GI General Information” to check general to confirm general precautions.
SEF234G
SEF233G
Page 876 of 3066
BRC-8
[4WD/ABS]
TROUBLE DIAGNOSIS
DIAGNOSIS FLOW
SFIA0293E
Page 877 of 3066
TROUBLE DIAGNOSIS
BRC-9
[4WD/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
ASKING COMPLAINTS
lComplaints against malfunction vary depending on each person.
It is important to clarify customer complaints.
lAsk customer about what symptoms are present under what
conditions. Use information to reproduce symptom while driving.
lIt is also important to use diagnosis sheet so as not to miss infor-
mation.
TROUBLE DIAGNOSIS SHEET - EXAMPLE
SBR339B
SFIA0029E
Page 878 of 3066
BRC-10
[4WD/ABS]
TROUBLE DIAGNOSIS
Component Parts Location
EFS001BD
SFIA0344E
Page 879 of 3066
TROUBLE DIAGNOSIS
BRC-11
[4WD/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
SchematicEFS001BE
TFWA0001E
Page 880 of 3066
BRC-12
[4WD/ABS]
TROUBLE DIAGNOSIS
Wiring Diagram — ABS —
EFS001CL
TFWA0002E