NISSAN X-TRAIL 2001 Service 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
●If 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.
●When 4WD and ABS warning lamp is ON, vehicle is in 2WD.
How to Proceed with Trouble DiagnosisEFS001BC
BASIC CONCEPT
●The most important point to perform trouble diagnosis is to understand vehicle systems (control and
mechanism) 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 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”.
●It 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.
●After completing diagnosis, always erase diagnostic memory.
Refer to BRC-24, "
Operation Procedure" .
●For intermittent malfunction, move harness or harness connector by hand. Then check poor contact or
false open circuit.
●Always read “GI General Information” to check general to confirm general precautions.
SEF234G
SEF233G

BRC-8
[4WD/ABS]
TROUBLE DIAGNOSIS
DIAGNOSIS FLOW
SFIA0953E

TROUBLE DIAGNOSIS
BRC-9
[4WD/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 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.
TROUBLE DIAGNOSIS SHEET - EXAMPLE
SBR339B
SFIA0029E

BRC-10
[4WD/ABS]
TROUBLE DIAGNOSIS
Component Parts Location
EFS001BD
SFIA1098E

TROUBLE DIAGNOSIS
BRC-11
[4WD/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
SchematicEFS001BE
TFWA0001E

BRC-12
[4WD/ABS]
TROUBLE DIAGNOSIS
Wiring Diagram — ABS —
EFS001CL
TFWA0002E

TROUBLE DIAGNOSIS
BRC-13
[4WD/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
TFWA0003E

BRC-14
[4WD/ABS]
TROUBLE DIAGNOSIS
TFWA0004E

TROUBLE DIAGNOSIS
BRC-15
[4WD/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
TFWA0005E

BRC-16
[4WD/ABS]
TROUBLE DIAGNOSIS
TFWA0006E