1998 NISSAN PICK-UP Repair Manual

G SENSOR
Always replace G sensor if bumped or dropped. Otherwise,
performance characteristics of G sensor will be changed,
which in turn changes ABS control performance character-
istics.
ABS ACTUATOR AND ELECTRIC UNIT
Removal
1. Disconnect battery cable.
2. Drain brake fluid. Refer to ``Changing Brake Fluid'', BR-3.
3. Remove mounting bracket fixing bolts and nuts.
4. Disconnect connector, brake pipes and remove fixing nuts.
Installation
CAUTION:
After installation, refill brake fluid. Then bleed air. Refer to
``Bleeding Brake System'', BR-4.
1. Connect brake pipes temporarily.
2. Tighten fixing bolts and nuts.
3. Tighten brake pipes.
4. Connect connector and battery cable.
SBR074E
SBR075E
ANTI-LOCK BRAKE SYSTEM
Removal and Installation (Cont'd)
BR-37

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 instantly drives the actuators. It is essential that both kinds
of signals are proper and stable. It is also important to check for
conventional 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 inter-
mittently rather than continuously. 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 only may not find the cause of the problems, so
a road test should be performed.
Before undertaking actual checks, take a few minutes to talk with
a customer who approaches with a ABS complaint. The cus-
tomer 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 ``conventional'' problems first.
This is one of the best ways to troubleshoot brake problems on
an ABS controlled vehicle.
SEF233G
SEF234G
TROUBLE DIAGNOSES
BR-38

Preliminary Check
Check brake fluid level in reservoir
tank.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Low fluid level may indicate brake pad
wear or leakage from brake line.
Check brake line for leakage.
OKcNG
Repair.
b
Check brake booster for operation and air
tightness. Refer to BR-15.
OK
cNG
Replace.
b
Check brake pads, rotor, linings and drum.
Refer to BR-21, 23, 28.
OK
cNG
Replace.
Check brake fluid level in reservoir tank
again.
OK
cNG
Fill up brake fluid.
Check warning lamp activation.
When ignition switch is turned on, warn-
ing lamp turns on.
OK
cNG
Check fuse, warning lamp
bulb and warning lamp
circuit.
Check warning lamp for deactivation after
engine is started.
OK
cNG
Go to Self-diagnosis,
BR-53, 57.
Drive vehicle at speeds over 30 km/h (19
MPH) for at least 1 minute.
Ensure warning lamp remains off while
driving.
OK
cNG
Go to Self-diagnosis,
BR-53, 57.
END
SBR451D
SBR389C
SBR058C
SBR059C
SBR069E
.
.
.
.
.
.
.
.
.
TROUBLE DIAGNOSES
BR-39

Component Parts and Harness Connector
Location
SBR076E
TROUBLE DIAGNOSES
BR-40

Schematic/2WD Models
HBR067
TROUBLE DIAGNOSES
BR-41

Wiring Diagram Ð ABS Ð/2WD LHD Models
HBR068
TROUBLE DIAGNOSES
BR-42

HBR069
TROUBLE DIAGNOSES
Wiring Diagram Ð ABS Ð/2WD LHD Models
(Cont'd)
BR-43

HBR070
TROUBLE DIAGNOSES
Wiring Diagram Ð ABS Ð/2WD LHD Models
(Cont'd)
BR-44