Nissan Primera P11. Manual — part 45
How to Perform Trouble Diagnoses for Quick
and Accurate Repair
INTRODUCTION
The ABS system has an electronic control unit to control major
braking functions. The control unit accepts input signals from
sensors and utilises the data to instantly drive the actuators. It is
essential that both input and output signals are correct 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 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 unnecessary replacement of good parts.
A visual check may not be sufficient to find the cause of the
problems, so a road test should also be performed.
Before undertaking actual checks, take just a few minutes to talk
with a customer who approaches with a 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 “conventional” problems first.
This is one of the best ways to troubleshoot brake problems on
an ABS controlled vehicle.
SEF233G
SEF234G
TROUBLE DIAGNOSES
BR-57
WORK FLOW
CHECK IN
F
Reference item
LISTEN TO CUSTOMER COMPLAINTS
INVESTIGATE ITEMS YOU SHOULD CARRY OUT
RELARED TO EACH SYMPTOM AND NOTE
F
Go to MALFUNCTION
CODE/SYMPTOM
CHART, BR-76.
CHECK FOR ANY SERVICE BULLETINS.
E
ELIMINATE GOOD SYSTEMS AND GOOD PARTS
F
Go to Preliminary
Check, BR-59.
Not self-diagnostic item
Self-diagnostic item
H
H
DETERMINE MALFUNCTION-
ING CIRCUIT(S) OR PART(S).
F
Go to Self-diagnosis,
BR-67.
Self-diagnosis
H
●
Go to Diagnostic
Procedure(s) 6 - 12,
BR-85.
●
Go to Component
Parts and Harness
Connector
Location, BR-60.
ELIMINATE GOOD PART(S), HARNESS(ES) OR CONNEC-
TOR(S) THROUGH ELECTRICALLY TESTING
F
Malfunctioning
harness(es) and
connector(s)
Malfunctioning parts
H
H
INSPECTION OF EACH
COMPONENT
F
Go to Diagnostic Pro-
cedure(s) 1 - 5, BR-77.
H
REPAIR
REPAIR OR REPLACE
H
H
NG
FINAL CHECK
OK
CHECK OUT
H
H
H
H
H
TROUBLE DIAGNOSES
How to Perform Trouble Diagnoses for Quick
and Accurate Repair (Cont’d)
BR-58
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.
OK
E
NG
Repair.
F
Check brake booster for operation and
air tightness. Refer to BR-18.
OK
E
NG
Replace.
F
Check brake pads and rotor. Refer to
BR-23, 26, 33.
OK
E
NG
Replace.
Check brake fluid level in reservoir tank.
OK
E
NG
Fill up brake fluid.
Check warning lamp activation.
When ignition switch is turned on,
warning lamp turns on.
OK
E
NG
Check fuse, warning
lamp bulb and warning
lamp circuit.
Check warning lamp for deactivation.
When ignition switch is turned on,
warning lamp turns on, then deacti-
vates after 1 second.
OK
E
NG
Go to Self-diagnosis,
BR-67 and BR-70.
Drive vehicle at 30 km/h (19 mph) for
at least one minute.
Ensure warning lamp remains off while
driving.
OK
E
NG
Go to Self-diagnosis,
BR-67 and BR-70.
END
NBR141
MAX.
MIN.
SBR389C
SBR058C
SBR059C
.
NBR284
ABS warning light
H
H
H
H
H
H
H
H
H
TROUBLE DIAGNOSES
BR-59
Component Parts and Harness Connector
Location
NBR285
Brake tube connector
Warning light
ABS actuator
and electric unit
Front wheel sensors
Front left wheel sensor connector
Front right wheel sensor connector
Sensor
E17
Rear wheel sensors
Rear left wheel sensor connector
Rear right wheel sensor connector
B33
Rear left wheel
sensor connector
B32
Rear right wheel
sensor connector
.
Rear tire
.
E78
E57
Sensor
TROUBLE DIAGNOSES
BR-60
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