Nissan Silvia. Manual — part 91

PBR455D

ACTIVE TEST PROCEDURE

=NMBR0099S04

I

When conducting Active test, vehicle must be stationary.

I

When ABS warning lamp stays on, never conduct Active test.

1.

Turn ignition switch OFF.

2.

Connect CONSULT-II to data link connector.

3.

Start engine.

4.

Touch “START” on CONSULT-II screen.

SBR802E

5.

Touch “ABS”.

SBR636E

6.

Touch “ACTIVE TEST”.

SBR638E

7.

Select active test item by touching screen.

SBR639E

8.

Touch “START”.

9.

Carry out the active test by touching screen key.

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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION

ABS

CONSULT-II Inspection Procedure (Cont’d)

BR-47

DATA MONITOR MODE

=NMBR0099S05

MONITOR ITEM

CONDITION

SPECIFICATION

FR RH SENSOR
FR LH SENSOR
REAR SENSOR

Drive vehicle.
(Each wheel is rotating.)

Wheel speed signal
(Almost the same speed as speedometer.)

STOP LAMP SW

Brake is depressed.

Depress the pedal: ON
Release the pedal: OFF

FR RH IN SOL
FR RH OUT SOL
FR LH IN SOL
FR LH OUT SOL
RR IN SOL
RR OUT SOL

1. Drive vehicle at speeds
over 30 km/h (19 MPH) for at
least 1 minute.
2. Engine is running.

Operating conditions for each solenoid valve are indicated. ABS
is not operating: OFF

MOTOR RELAY

ABS is not operating: OFF
ABS is operating: ON

ACTUATOR RELAY

Ignition switch is ON or
engine is running.

Ignition switch ON (Engine stops): OFF
Engine running: ON

WARNING LAMP

ABS warning lamp is turned on: ON
ABS warning lamp is turned off: OFF

BATTERY VOLT

Power supply voltage for control unit

ABS OPER SIG

ABS is not operating: OFF
ABS is operating: ON

ACTIVE TEST MODE

NMBR0099S06

TEST ITEM

CONDITION

JUDGEMENT

FR RH SOLENOID
FR LH SOLENOID
RR SOLENOID

Engine is running.

Brake fluid pressure control operation

IN SOL

OUT SOL

UP (Increase):

OFF

OFF

KEEP (Hold):

ON

OFF

DOWN (Decrease):

ON

ON

ABS MOTOR

ABS actuator motor
ON: Motor runs (ABS motor relay ON)
OFF: Motor stops (ABS motor relay OFF)

ABS OPER SIG

Ignition switch is ON or
engine is running.

ON: Set ABS OPER SIG “ON” (ABS is operating.)
OFF: Set ABS OPER SIG “OFF” (ABS is not operating.)

NOTE:
Active test will automatically stop ten seconds after the test starts. (TEST IS STOPPED monitor shows ON.)

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION

ABS

CONSULT-II Inspection Procedure (Cont’d)

BR-48

SEF233G

SEF234G

How to Perform Trouble Diagnoses for Quick
and Accurate Repair

NMBR0100

INTRODUCTION

NMBR0100S01

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 sig-
nals are proper and stable. It is also important to check for conven-
tional 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 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 an ABS complaint. The customer
is a very good source of information on such problems; especially
intermittent ones. By talking to the customer, find out what symp-
toms 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 con-
trolled vehicle.
Also check related Service bulletins for information.

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TROUBLE DIAGNOSIS — INTRODUCTION

ABS

How to Perform Trouble Diagnoses for Quick and Accurate Repair

BR-49

Preliminary Check

NMBR0101

1

CHECK BRAKE FLUID

Check brake fluid for contamination.

Has brake fluid been contaminated?

Yes

©

Replace. GO TO 2.

No

©

GO TO 2.

2

CHECK BRAKE FLUID LEVEL

Check brake fluid level in reservoir tank.
Low fluid level may indicate brake pad wear or leakage from brake line.

SBR451D

Is brake fluid filled between MAX and MIN lines on reservoir tank?

Yes

©

GO TO 3.

No

©

Fill up brake fluid. GO TO 3.

3

CHECK BRAKE LINE

Check brake line for leakage.

SBR389C

Is leakage present at or around brake lines, tubes or hoses or are any of these parts cracked or damaged?

Yes

©

Repair. GO TO 4.

No

©

GO TO 4.

TROUBLE DIAGNOSIS — BASIC INSPECTION

ABS

Preliminary Check

BR-50