2002 NISSAN TERRANO Service Repair Manual

How to Perform Trouble Diagnoses for Quick
and Accurate Repair
INTRODUCTION
The ABS system has an electronic control unit to control major
functions. The control unit accepts input signals from sensors and
uses this data to compute control characteristics to instantly drive
the actuators. It is essential that both kinds of signal are accurate
and stable. It is also important to check for conventional brake
system problems: such as air leaks in booster lines, lack of brake
fluid, or other problems with the brake system.
It is much more difficult to diagnose a problem that occurs intermit-
tently rather than catastrophically. Most intermittent problems are
caused by poor electric connections or faulty wiring. In this case,
careful checking of suspicious circuits may help prevent the
replacement of good parts.
A visual check may not be sufficient to determine the cause of the
problems, so a road test should also be conducted.
Before undertaking actual checks, take a few minutes to talk with
a customer who approaches with an ABS complaint. The customer
is a very good source of information on such problems; especially
intermittent ones. Through the talks with the customer, find out what
symptoms are present and under what conditions they occur.
Start your diagnosis by looking for ªconventionalº problems first.
This is one of the best ways to troubleshoot brake problems on an
ABS controlled vehicle.
SEF233G
SEF234G
TROUBLE DIAGNOSES
BR-47

Component Parts and Harness Connector
Location
YBR264
TROUBLE DIAGNOSES
BR-48

Circuit Diagram for Quick Pinpoint Check
YBR244
TROUBLE DIAGNOSES
BR-49

Wiring Diagram Ð ABS Ð
LHD MODELS
YBR245
TROUBLE DIAGNOSES
BR-50

YBR246
TROUBLE DIAGNOSES
Wiring Diagram Ð ABS Ð (Cont'd)
BR-51

YBR247
TROUBLE DIAGNOSES
Wiring Diagram Ð ABS Ð (Cont'd)
BR-52

YBR248
TROUBLE DIAGNOSES
Wiring Diagram Ð ABS Ð (Cont'd)
BR-53

RHD MODELS
YBR249
TROUBLE DIAGNOSES
Wiring Diagram Ð ABS Ð (Cont'd)
BR-54