Mitsubishi Eclipse Workshop Manual page 407

SERVICE BRAKES
-
Special
Tools/Anti-skid
Braking System Troubleshooting
35-5
Tool
Number
Name
Use
Rear axle shaft
puller
M8990211
M8991354
Sliding hammer
Puller body
Removal
of rear axle
shaft
M8990767
End
yoke holder
Securing the hub
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ANTI-SKID BRAKING
SYSTEM
TROUBLESHOOTING
E36EC-
PARTICULAR CHARACTERISTICS
OF
THE
ANTI-SKID BRAKING SYSTEM
Models equipped with the anti-skid braking system
(ABS) may
exhibit one
or
more
of
the
following
characteristics from time to time. but none of these
is abnormal.
{1
) A pulsing feeling in the brake pedal. or vibration
of the
body
or the
steering wheel, when the
auti-skid braking system is activated by sudden
braking or by braking on a slippery road surface.
Actually. this phenomenon is an indication that
the anti-skid
braking system is
functioning
normally.
(2) When the vehicle speed reaches approximately
6
km,zh
(4 mph) after the engine
is started and
the
vehicle starts
off (for the first time).
a
whining motor noise may be heard from
the
engine compartment if the vehicle
is
traveling
in
a
quiet place. This noise
is simply the result öf
a
self-check being made of
the anti-skid
braking
system operation.
TROUBLESHOOTING
M
ETHODS
Problems related
to
the
anti-skid braking
system
{ABS)
can be classified into two general
ca,-tegbries:
problems in the
electrical system and those-in the
hydraulic
system.
For problems
in the
electrical system.
the
self-
diagnosis
function
is built into the electronic control
unit
(ECU) causing
the
ABS warning lamp
to
illuminate
as
a
warning
to
the
driver.
In
this
instance, checks can be made by using
the
multi-
use tester
and
oscilloscope.
Problems
in the
hydraulic system (poor
braking.
etc.) can be located in the same way
as
for ordinary
brakes. There is, however, the necessity
to
check
to
determine whether the problem is related to ordinary
brake components
or to the components
related to
the
ABS.
To
make
this
check. use
the
multi-use
tester.
HOW TO USE THE TROUBLESHOOTING
FLOW CHART
(1) Using the flow chart, check the
ABS warning
lamp light-up
sequence. Read
the
diagnosis
codes and check the condition of braking opera-
tion.
(2)
Following the check chart listed in the remedy
column, perform the
checks. There are [Explana-
tionl
and [Hint]
in
each check chart. Refer to
them when
troubleshooting.
;
NOTE
ECU:
Electronic control unit
HU:
Hydraulic unit
MUT:
Multi-use tester
D
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O
Mlbublrhl
Moto6Corpor.tion
Apr.
1991
PWuEgorO