Page 1
Page 2
0 zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Copyright 1997
Subaru of America. Inc.
All rights reserved.
This book may not be reproduced in whole
or in part without the express written permission
of Subaru of America, Inc.
Subaru of America, Inc. reserves the right at any time to make changes or modifications to systems, procedures, descriptions, and illustrations contained in this book without necessarily
updating this document. Specifications included are accurate as they existed at the time of publication. Information herein is considered current as of August, 1997.
0
Subaru of America, Inc. MSA5AV146B
Page 3
AN
INTRODUCTION TO zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
ABS
INTRODUCTION zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
OVERVIEW
DIFFERENCES BETWEEN THE
COMPONENT LOCATIONS
OPERATION
Pressure Decrease
PressureHold
Pressure Increase
DIAGNOSTICS
Using the New Select Monitor with the Service Manual
Using the New Select Monitor for Diagnosis
Example of a Troubleshooting Procedure
Diagnosis Without the New Select Monitor
Using the Trigger Option
BRAKEBLEEDING
Sequencecontrol
Checking the Pedal Stroke
Commanding Sequence Control Without the Select Monitor
CONCLUSION
............................................
................................................
................................................
.............................................
................................................
..............................................
..............................................
.......................................
.........................................
.............................................
......................................
..............................................
5.3
5.3
SYSTEM
AND THE
5.3i
DIAGNOSIS
..............
..................................
...............
........................
...........................
.........................
............
3
4
6
7
8 zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
8
9
9
10
12
14
15
16
16
18
18
19
19
19
2
Video Reference Booklet
Page 4
AN
INTRODUCTION TO
ABS
This Video Reference Booklet accompanies
the videotape “An Introduction to ABS 5.3
System Diagnosis.” It summarizes the
information contained in the videotape.
This Booklet provides an overview of the
ABS 5.3 system; it covers the differences
between the 5.3 and the 5.3i, component
locations, a brief overview of the operation
of the ABS 5.3, diagnostics, and the brake
bleeding procedure.
Before using this videotape and the
Booklet, you should meet the following
prerequisites:
1.
You should be familiar with basic brake
system diagnosis and repair, including the
brake bleeding procedure. zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
5.3
SYSTEM
DIAGNOSIS zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
2.
You should know how ABS systems
operate.
3. You should be familiar with Subaru
Service Manuals and be able to read the
electrical wiring diagrams.
4.
You should know how to operate the
New Select Monitor.
If you do not meet these prerequisites, talk
to your supervisor or district technical
manager to arrange for additional training.
zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Video
Reference
Booklet
3
Page 5
AN
INTRODUCTION zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
TO
ABS
5.3 zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
SYSTEM
DIAGNOSIS
VERVIEW zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
The ABS 5.3 is a four-sensor, four channel
system. It controls the front wheels independently during ABS braking. It controls
the rear wheels as a pair, as appropriate for
whichever of the two wheels is turning
more slowly.
The ABS 5.3 system has improved selfdiagnostics and trouble code memory, and
it can communicate with OBD-I1 testers,
such as the New Select Monitor.
zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
It was introduced in 1996 on Legacy vehicles equipped with ABS. More recently, an
updated system, the ABS 5.3i, has been
introduced. The 5.3i is used on the 1998
Forester, late 1997 Legacy, and late 1997
Impreza vehicles equipped with ABS.
(1)
ABS control module and hydraulic zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
control unit (ABSCM&H/U)
(2)
Proportioning valve zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
(3)
Diagnosis connector
(4)
Data link connector (for SUBARU
select monitor)
4
Video Reference Booklet
(5)
G
sensor
(6)
ABS warning light
(7)
Tone wheel
(8)
ABS sensor
ABS
5.3i
System
(9)
Wheel cylinder
(1
0)
Transmission control moi
AT vehicle)
(11)
Brake switch
(1
2)
Master cylinder
le (only
Page 6
AN
INTRODUCTION
TO
ABS
19961Early 1997 Legacy 1998 Forester
Hydraulic Unit
NIPPON Brake lines come Under Passenger's Seat
BOSCH Brake lines come Under Passenger's Seat
ABS-2E Brake lines come Under Passenger's Seat
of
into top
brake bleeders on
top
in top of unit in shape
of
in top of unit lined up
in straight line.
unit. Has
of
unit.
a square.
I
5.3
90-94 Legacy
Computer Location
SYSTEM
-.
DIAGNOSIS zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
I
Long Term Memory? I Select Monitor?
No No
No No
zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Yes No
I
Hydraulic Unit Computer Location Long Term Memory?
ABS-2E Brake lines come in Under Passenger's Seat Yes
ABSiTCS
front wheel drive
Legacy Auto only
ABS 5.3 Motor stands upright, To the right
ABS 5.3i Motor lies down, Computer part
95
of
unit lined in
top
straight line.
Two brake lines Under Passenger's Seat Yes
come in top and two
in side
of
unit.
of
brake lines come in
the side
brake lines come in
the top in the shape
of a square.
of
the unit.
Legacy. To the left
1993-97 lmpreza - ABS-2E
1997 lmpreza - ABS 5.3
1998 lmpreza
1992-96
1998 Forester
the glove box in the Yes
of
the steering
colum in the Impreza.
of
the Hydraulic unit. Yes
-
ABS 5.3i
SVX
-
Nippon
-
ABS 5.3i
ABS Applications
zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Video
Reference
Select Monitor?
No
Yes
Yes
Yes
Booklet zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
5
Page 7
AN
INTRODUCTION TO
ABS
@
Hydraulic zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
control
@
Proportiming vaive select monitor)
0
ABS
control
@
Diagnosis connector (only
@
ABS
warning
i
unit
module
laht
8 zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Dah link connector
(2,
Transmission control module
AT
@
Tonewheei
ABS
5.3
(for zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
vehicle)
5.3
System
SYSTEM
SUBARU
@I
@
03 zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
@
0
03
ABS
sensor
Whedcylinder
0
sensor (only
Brakeswitch
Master cylinder
fleiay
box
DIAGNOSIS
AWD
vehicle)
Although the ABS 5.3 and 5.3i systems are
in
similar
most ways, there are a fen!
important differences.
On the ABS 5.3, the ABS control
located behind and to the right
box. With the 5.3i, the ABS control
unit
of
the glove
unit
is
is
mounted on the Hydraulic Control Unit
(HCU).
The Select Monitor can communicate only
with the
ABS
5.3. The New Select
Monitor can communicate with both the
5.3 and 5.3i, using the appropriate cartridges.
Select
Monitor
(Left)
and
New Select Monitor (Right)
6
Video
Reference
Booklet
Page 8
AN
INTRODUCTION
TO
ABS
5.3
SYSTEM
DIAGNOSIS zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
OMPONENT LOCATIONS zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Most of the ABS
are located in the engine compartment.
The HCU is located under the hood at the
front right corner. It contains the solenoid
valves used to control hydraulic pressure to
the wheels during ABS braking, as well as
the motor pump assembly and the relays.
In the 5.3i version, the ABS control unit is
mounted on the HCU, instead
glove box.
For both models, the G sensor is located
under the center console.
ation and deceleration,
control unit can compare the actual speed
of the vehicle with the speed reported by
the wheel speed sensors.
DIAGNOSIS CONNECTOR
5.3
and 5.3i components
of
behind the
It
senses acceler-
so
that the ABS
The diagnosis connector is located above
the accelerator pedal. It can be used to
manually read and clear trouble codes.
Connecting Cable
The Data Link Connector (DLC) is located
under the dash panel on the driver’s side.
allows the New Select Monitor to communicate with several of the vehicle’s systems,
including the ABS.
to Data
Link Connector
It
At each wheel, there’s a speed sensor and a
tone wheel. The tone wheel provides a
magnetic pulse to the wheel speed sensor,
which the ABS control unit uses to deter-
of
mine the speed
Diagnosis Connector
I
Wheel Speed Sensor and Tone Wheel zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
rotation of the wheel. zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Video
Reference
Booklet zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
7
Page 9
AN
INTRODUCTION TO
ABS
5.3
SYSTEM
DIAGNOSIS zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
PERATION zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Hydraulic fluid is directed from the master
cylinder to the brake calipers at each
HCU
wheel, where the
flow by means of eight solenoid valves.
There
for each wheel. During normal braking,
the inlet valve is open and the outlet valve
is closed.
There are three ABS modes: Pressure
Decrease, Pressure Hold, and Pressure
Increase. When the ABS control unit senses that one
to lock up, it activates the ABS system and
controls braking for the affected wheel, in
these ABS modes.
motor-pump assembly.
is
an inlet valve and an outlet valve
or
more of the wheels
controls brake fluid
is
starting
It
also activates the
FROM MASTER CYLINDER CHAMBER
DAMPER
Pressure Decrease
RESERVOIR
In the Pressure Decrease mode, the
closes the inlet solenoid valve, shutting off
pressure from the master cylinder to the
brake caliper at the affected wheel. At the
same time it opens the outlet solenoid
valve, releasing brake fluid pressure from
the caliper, reducing braking at that wheel.
HCU
Hydraulic System zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
FROM MASTER CYLINDER CHAMBER
II
-
Normal Braking
DAMPER
n
8
Video Reference Booklet
INTLET
Hydraulic System
kl
I33
RESERVOIR
-
Pressure Decrease zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Page 10
Page 11
‘ zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
AN
INTRODUCTION
TO
ABS zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
The ABS 5.3 system has extensive selfdiagnostic capabilities. When the ignition
switch is turned from “Off” to “On,” the
ABS system performs an electrical selfcheck and illuminates the ABS warning
1
1/2
light for
electrical problems, the system then turns
the light
The ABS 5.3 system performs a second
check when vehicle speed reaches 3 mph
(if the brake has not been applied) or
mph (if the brake has been applied).
During this second self-check, the ABS
system operates its motor pump for
ond and exercises the solenoids.
off. zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
seconds. If there are no
ABS
Warning Light
0.2
8
sec-
5.3
Otherwise, the ABS system assumes there
is no problem.
If a vehicle with an ABS 5.3 or 5.3i system
has an ABS warning light that stays on,
you can use the New Select Monitor to
read its trouble codes. Simply plug in the
New Select Monitor, turn the ignition
switch to “On,” and select “Each System
Check” from the main menu.
SYSTEM
New Select Monitor - “Each System
Check” Selected
DIAGNOSIS
If the ABS control unit does not detect any
problems it keeps the ABS warning light
off. If the control unit does find a problem, it turns the ABS warning light on and
stores one or more trouble codes. The ABS
system then remains passive even if a
wheel begins to lock up.
If the problem involves one of the wheel
speed sensors, with the ABS 5.3i, the system waits until the next ignition cycle
before turning the ABS warning light on.
If, at the next ignition cycle, the ABS system sees the same wheel speed sensor
problem again, it turns on the ABS warning
light and the system stays passive,
10
Video
Reference
Booklet
New Select Monitor - “ABSRCS”
Next, select “ABS/TCS.” zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Selected
Page 12
AN
INTRODUCTION TO
ABS
New Select Monitor - “ABS AWD AT?”
The New Select Monitor now asks you
whether the vehicle has all-wheel drive and
automatic transmission. Press the “Yes”
button, then select “Diagnostic Code(s)
Display.” The New Select Monitor will
display the trouble codes stored in the ABS
memory, beginning with the most recent.
Be sure to write down any trouble codes
you find.
5.3
SYSTEM zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
DIAGNOSIS
New Select Monitor - “Diagnostic Code($
Display” Selected
For every trouble code, the Service Manual
provides a step-by-step troubleshooting
procedure.
AJ:
TROUBLE CODE
-
DETECTION OF G SENSOR STICK
DIAGNOSIS:
Faulty G sensor output voltage
TROUBLE SYMPTOM
ABS
does not operate.
WIRING DIAGRAM:
56
Typical Troubleshooting
Procedure
10AJ1 zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
:
CHECK ALL FOUR WHEELS FOR
FREE TURNING.
-
DETECTION
-
New Select Monitor - ABS Trouble
Code Displayed
OF 0 SENSOR STICK
10AJ2
:
CHECK OUTPUT OF zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
USING SELECT MONITOR.
0
SENSOR
Video Reference Booklet
71
Page 13
Page 14
AN
INTRODUCTION
TO
ABS
Before beginning diagnosis, this Chart
directs you to ask the customer when and
how the problem occurred. To assist the
service advisor with gathering the informa-
5.3
SYSTEM
DIAGNOSIS zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
the problem exists, and to check for any
obvious causes, such as low battery voltage, low brake fluid, brake drag, a worn
brake pad or rotor, or tire problems.
tion needed, the Service Manual provides a
list of additional interview questions. The
service advisor should ask these questions,
and write down all the information the customer provides.
The pre-inspection also includes a check of
ABS
the
tion switch from “Off’ to “On.” If the
electrical system: turn the igni-
ABS
warning light does not come on or comes
on and stays on, there is an electrical probNext, the Chart directs you to perform a
lem.
zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
pre-inspection on the vehicle, to verify that
B:
CHECK
Check The Following Items
1.
THE STATE
ABS
warning light
:omes on.
gnition key position
hing
- zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
LIST
FOR
INTERVIEW
OF
THE ABS WARNING LIGHT
L?
0
0
0
0
0
0
0
OWhen turning
0
-ition
About
Always
Sometimes
Only once zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Does not come on zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
When I how long does it come on?
LOCK
ACC zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
ON
(before starting engine)
START
On after starting (Engine is running)
On after starting (Engine is stopped)
Immediately after ignition is
Immediately after ignition starts
When advancing krnlh
While traveling at a constant speed km/h
When decelerating km/h
When turning
When moving other electrical parts
Parts name
:
The Vehicle’s
to
right Steering angle
to
left Steering angle
:
State.
ON
Steering time
Steering time
to
kmlh
MPHto MPI-
I
MPHto MPF
:
:
:
:
/
to
MPI-
km/t
deg
sec
deg
sec
Check List
for
Interview
Video
Reference
Booklet
13
Page 15
AN
INTRODUCTION zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
TO
11.
General Diagnostics
ABS
Table
5.3
SYSTEM
DIAGNOSIS
A: SYMPTOMS AND PROBABLE CAUSES zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
~~
I
I
‘ehicle instability during braking
Vehicle pulls zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBAto either side.
Vehicle spins
Long brak1ngIstopping distance
Wheel locks.
a
ABSCMBHIU
a
ABS
a
Brake (caliper zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
a
Wheel alignment
a
Tire specifications, tire wear and air pressures
Incorrect wiring or piping connections
a
Road surface (uneven, camber)
a
ABSCMBHIU
ABS
a
Brake (pads)
a
Tire specifications, tire wear and air pressures
a
Incorrect wiring or piping connections
a
ABSCMBHIU
Brake (pads)
Air in brake line
lire specifications, tire wear and air Dressures
a
Incorrect wiring or piping connections
ABSCMBHIU
a
ABS
a
Incorrect wiring or piping connections
ABSCMBH/U
a
ABS
a
Master cviinder
Probable faulty unitsipam
(solenoid valve)
sensor
8.
piston, pads)
(solenoid valve)
sensor
(solenoid valve)
(solenoid valve. motor)
sensor
(solenoid valve)
sensor
General Diagnostics Table zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
If there are one or more trouble codes
stored, the Chart directs you to retrieve
them using the Select Monitor, and perform
your diagnosis using the procedure specified for the trouble codes found, making
the appropriate repairs.
If there are no trouble codes, the Chart
directs you to continue your inspection
using the “General Diagnostics Table” at
the end of Section
New Select Monitor - “Clear Memory” Selected
4-4.
After you have finished your repair, the Chart
tells you to clear the trouble codes from
memory using the New Select Monitor, then
road test the vehicle and see if any new trouble codes are set.
If a new trouble code is set, the Chart tells
you to diagnose the problem according to the
trouble code diagnostic procedures in the
Service Manual.
When there are no more trouble codes, the
Chart directs you to confirm that your repair
has fixed the problem, and that the
ABS
warning light does not come back on.
Using the New Select Monitor for
Diagnosis
Not only does the New Select Monitor allow
you to read trouble codes, it also helps with
diagnosis. For example, let’s assume the
vehicle has a trouble code
G-Sensor Stick. Note that the New Select
Monitor doesn’t just tell you the code num-
-
it also tells you which one of the four
ber
possible problems has caused the
trol module to set Code
56.
56
-
Detection
ABS
con-
of
14
Video
Reference
Booklet
Page 16
AN
INTRODUCTION TO
ABS
The Service Manual, Part T,
“Troubleshooting,” Section
the diagnostic procedure for trouble code
56,
Detection
you’re looking at the diagnostic procedure
for the actual problem in this case; there
are three other diagnostic procedures for
trouble code
Whenever a trouble code is set, the ABS
5.3
system stores the values of its inputs
and outputs. Before going further with the
diagnostic procedure, you can look at the
data display and see what the values were,
at the time the trouble code was set.
To do this, select “Each System Check,” as
before. then select “ABS/TCS.”
of
G-Sensor Stick. Be sure
56!
4-4
provides
5.3
SYSTEM
example, Code
to know what the G-sensor voltage was,
when the code was set.
want to take note of any other values that
are unusual.
Example
Procedure
Let’s look at the troubleshooting procedure
described in the Service Manual for Code
56
-
Detection of G-Sensor Stick. As a first
step, the diagnostic procedure directs you
to “check all four wheels for free turning.”
It asks, “Have the wheels been turning
freely, such as when the vehicle is lifted
up?” If
-
you should just erase the trouble code.
of
so,
it tells you the system is normal
DIAGNOSIS zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
56,
you would at least want
You
a Troubleshooting
would also
When the New Select Monitor asks
whether the vehicle has all-wheel drive and
automatic transmission, if the vehicle is
equipped with automatic transmission,
press the “Yes” button.
#5,
“Freeze Frame
Now, select option
Data.”
From the Freeze Frame Menu, select “Data
Display.” The New Select Monitor will
now give you values for
meters at the time the DTC was set. In this
zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
New Select Monitor zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Data” Selected
zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
New Select Monitor - “Current Data Display
and Save” Selected
If not, the procedure tells you to use the
Select Monitor to check the voltage output
1,
“Current
on
-
“Freeze Frame
11
different para-
of the G sensor. Select Option
Data Display and Save” and use it to read
the G-sensor voltage. Depending
whether the voltage reading is correct or
not, you would then troubleshoot the sensor or the circuit, following the diagnostic
procedure in the Service Manual.
By the way, when the diagnostic procedure
tells you to check a connector, pay particular attention to it.
zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Video
Reference
Booklet
15
Page 17
AN
INTRODUCTION TO
ABS
Diagnosis Without the New Select
Monitor
In addition to diagnosis using the Select
Monitor, the Service Manual also provides
a procedure for diagnosis of the ABS
without the Select Monitor. In this case,
with the ignition switch “Off,” you would
ground terminal
tor, using one of its grounding wires; turn
the ignition switch to “On”; and count the
ABS warning light blink codes. Then follow the procedure outlined in “Diagnostics
Chart for On-board Diagnosis System.”
zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
5.3
6
of
the diagnosis connec-
5.3
SYSTEM
From the System Selection Menu select
“ABS/TCS
The New Select Monitor will now ask you
whether the vehicle has automatic transmission (“ABS AWD AT”) Press “Yes.”
To
set up the New Select Monitor for the
Trigger option, select “1. Current Data
Display and Save,” at the “ABS Diagnosis”
menu. At the Data Display Menu select
“12 Data Display.” The system will now
display the ABS parameters.
.”
DIAGNOSIS zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
New Select Monitor
Diagnosis Connector zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Using the Trigger Option
One
of
the most useful features of the New
Select Monitor is the trigger option. When
you’re troubleshooting an intermittent
problem, this feature can be particularly
useful, if you can duplicate the problem.
The ABS control unit stores the values of
the parameters at the moment a trouble
code is set, in its internal memory.
New Select Monitor, however, can store
data on the parameters before, during, and
after a trouble code is set.
From the Main Menu, select
System Check.”
-
Pin zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
4%
Grounded
The
“2.
Each
zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
and Trigger Option
Using the S or “scroll” key, scroll the lower
command line
appears. Select the Trigger option, using
the F2 key.
so
New Select Monitor Keypad zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
-
ABS
Parameters
that the Trigger option
16
Video
Reference
Booklet
Page 18
AN
INTRODUCTION
TO
ABS
Next, set up the Trigger. At the Trigger
Set-Up Menu, set the New Select Monitor
so
it captures data when a code is set. At
the “Trigger” line, highlight “Code,” using
the right arrow key, then press the down
arrow key to enter this selection.
Set the Display Point at
point when the trouble code was set will be
displayed in the middle of the screen.
Set the Time Delay
Monitor will continue monitoring data for
an additional 30 seconds after the code was
set. This will allow you to see what the
values of the parameters were during the
period before the trouble code was set,
until 30 seconds after. Press the “Yes” key
when you have finished setting up the
Trigger function.
“1/2,”
so
that the New Select
so
that the
5.3
SYSTEM
the Select key (F2) to activate the Trigger
mode.
Drive the car on the road and duplicate the
conditions under which the trouble code
was set. The New Select Monitor will beep
when it has stopped recording.
New Select Monitor - Data Displayed Before,
During, and After Trouble Code Was Set
DIAGNOSIS
For example, the New Select Monitor
might show that a trouble code was set
when the wheel speeds were increasing, but
the G-sensor voltage remained the same,
2.3 1 volts. Ordinarily, G-sensor voltage
should drop below 2.3 volts when the car is
accelerating, and should rise above 2.3
when the car is decelerating. Using this
information, you could then troubleshoot
the sensor and the circuit to see why the
New Select Monitor zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Press
Menu. Press “C” again to get to the ABS
Diagnosis Menu.
Now, at the “Current Data Display and
Save” menu, select
then select the parameters whose values
you want to save when the trouble code is
set, using the “Yes” key and the down
arrow key to indicate the parameters you
want. You can set the New Select Monitor
to save data on up to
“C”
to return to the Data Display
-
Trigger Set-Up Menu
“12.
Data Display” and
16
parameters. Use
voltage remained constant.
Video
Reference
Booklet
17
Page 19
AN
INTRODUCTION zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
TO
ABS
You will need to perform the brake bleeding procedure any time air gets into the
system or after major service is performed,
such as replacing the HCU or the master
cylinder.
When bleeding the brakes, be sure to fol-
low all the cautions and notes in the
Service Manual, Part W, “Service
Procedures,” Section
First, bleed the brakes the conventional
way, in the order specified in the Service
Manual. Put one end of a vinyl tube on the
air bleeder port and the other end into a
container of brake fluid.
Setup for Bleeding Brakes
4-4.
5.3
SYSTEM
DIAGNOSIS zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Sequence Control
With an ABS system, once you have bled
the brakes in the conventional way, you
have to activate Sequence Control to push
air out of the HCU into the brake lines.
Otherwise, air trapped in the HCU will get
into the lines and the customer may return,
complaining that the brakes have become
“spongy.” During Sequence Control, the
HCU turns on the motor-pump assembly
and commands Pressure Decrease, Pressure
Hold, and Pressure Increase for each
caliper.
Using the New Select Monitor, command
Sequence Control, as follows. At the “ABS
“4.
Diagnosis” menu, select
Check Sequence” and follow the directions
displayed on the New Select Monitor’s
screen. Command Sequence Control
twice, in order to ensure that you have
expelled all air from the HCU. Then bleed
the brakes again, the conventional way, to
remove any air pushed out of the HCU into
the brake lines.
Function
Have a helper slowly depress the brake
pedal and keep it depressed, while you
open the air bleeder for
Then close the bleeder and slowly release
the brake pedal. After
repeat the procedure. Continue in this
fashion until there are no more air bubbles
in the fluid flowing out of the brake.
Then tighten the bleeder screw to a torque
of
5.8 zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
+/-
0.7
ft.lb.
(8
When all four brakes have been bled,
depress the brake pedal and keep it in that
position for about
there is no leak in the system. Then proceed to Sequence Control.
18
Video Reference
20
1
to zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
3
to 4 seconds
+/-
1
N-m).
seconds to make sure
Booklet
2
seconds.
New Select Monitor - “Function Check
Sequence” Selected
zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Page 20
AN
INTRODUCTION TO
ABS
Checking the Pedal Stroke zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Now, check the pedal stroke. With the
engine idling, depress the brake pedal with
110
the brake pedal effort gauge, at
force, and measure the distance between
the brake pedal and the steering wheel.
Release the brake pedal and measure it
again. For a vehicle with ABS, brake pedal
travel should not exceed 3 3/4 in. (95 mm).
If the travel is more than that, there may
still be some air inside the HCU. Perform
the brake bleeding procedure again, using
Sequence Control and conventional bleed-
ing.
lb. of
5.3
SYSTEM
Turn the ignition switch “On” and, within a
half second after the ABS warning light
goes off, depress the brake pedal and hold
it. The ABS will go into Sequence Control
and purge air from the HCU.
CONCLUSION
Effective diagnosis requires a logical, stepby-step approach. Be sure to use the
appropriate Service Manual, the New
Select Monitor, and this Video Reference
Booklet to look for trouble codes, perform
diagnosis, and bleed air from the system.
That way, you should have no trouble with
the ABS 5.3.
zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
DIAGNOSIS zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Using the Brake Pedal Effort
Gauge to Measure Travel
When bleeding is complete, add brake fluid
to the required level indicated on the brake
fluid reservoir by the line labeled “MAX.”
Finally, road test the vehicle at a low speed
and apply the brakes hard, two or three
times, to ensure that they work properly.
Commanding Sequence Control
Without the Select Monitor
You can also command Sequence Control
without the Select Monitor. To do this,
with the ignition switch “Off,” ground terminals 3 and
using the connector’s grounding wires.
6
of
the diagnosis connector,
Video Reference Booklet
19
Page 21
AN zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
INTRODUCTION
TO
ABS zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Mark your answers to the following questions and mail the quiz to Subaru Video Training Program Headquarters. zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
5.3
SYSTEM
DIAGNOSIS zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Name
Dealer Dealer Code
1. The ABS 5.3 is a -sensor, -channel system.
a. 4;2
b. 4;3
c. 3;4
d. 4;4
On
2.
the ABS 5.3i system, the ABS control unit is mounted zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
a.
Behind and to the right of the glove box.
Under the dash panel on the driver’s side.
b.
On
c.
d. Above the accelerator pedal.
The New Select Monitor, with appropriate cartridges, can communicate with:
3.
a. The ABS 5.3 only.
b.
c. The ABS 5.3i only.
During the Pressure Decrease mode
4.
b.
5.
6.
7.
8.
9.
10. At 110 lb. of force, with the engine idling, the brake pedal travel should not exceed:
the Hydraulic Control Unit (HCU).
Both the ABS 5.3 and 5.3i.
Neither the ABS 5.3 nor 5.3i.
d.
...
The inlet valve on the HCU is open and the outlet valve is closed.
a.
The inlet and outlet valves
The inlet valve
c.
The inlet and outlet valves
d.
With the ABS 5.3i, if the ABS system detects a wheel speed sensor problem, it
a. Turns the ABS warning light
b. Keeps the ABS system passive, even if one of the wheels begins to lock up.
c. Waits until the next ignition cycle, and if it sees the same wheel speed sensor problem again, turns on the
ABS warning light and keeps the ABS system passive.
d. None of the above.
According to the Service Manual, before beginning diagnosis of an ABS 5.3 problem, you should:
Ask the customer when and how the problem occurred.
a.
Perform a pre-inspection of the vehicle’s brake system.
b.
Check the ABS self-diagnostic system to see if it’s working properly.
c.
d. All of the above.
Without the New Select Monitor, it’s impossible to read ABS trouble codes.
a. True.
b. False.
The New Select Monitor can be used to store data about the values of various ABS 5.3 system inputs and
outputs before, during, and after a trouble code is set.
a. True.
b.
False.
When a vehicle equipped with ABS 5.3 is accelerating, its G-sensor voltage should:
a. Drop below 2.3 volts.
b. Rise above 2.3 volts.
c. Remain constant, at approximately 2.3 volts.
d. None of the above.
a. 2 1/2 in. (64 mm).
b.
3 1/4 in. (83 mm).
c.
3 3/4 in. (93 mm).
4 1/2 in. (1 14 mm).
d.
on
on
the HCU is closed and the outlet valve is open.
the HCU are open.
on
the HCU are closed. zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
on.
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Video
Reference
Booklet
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