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BRAKES
5 - 59
RWAL S E R V I C E D I A G N O S I S
INDEX
Page
General Information
59
GENERAL INFORMATION
A n anti-lock system malfunction w i l l be indicated
by i l l u m i n a t i o n of the amber anti-lock w a r n i n g lamp.
I n most cases, t h e r e d brake w a r n i n g l a m p w i l l also
i l l u m i n a t e a t the same t i m e .
I f a problem occurs, system diagnosis should begin
w i t h a fluid level check followed b y a v i s u a l exami-
n a t i o n o f t h e system electrical and h y d r a u l i c connec-
tions. I f obvious
defects
(low fluid, leaks,
loose
connections, etc.) are not evident, road test t h e vehi-
cle. A road test should help determine i f a malfunc-
t i o n is a c t u a l l y related to a n anti-lock component.
D u r i n g t h e road test, note i f other conditions are
evident such as a l o w pedal, p u l l , grab, or s i m i l a r
condition. Remember t h a t brake malfunctions such
as low fluid, system leaks, p a r k i n g brakes p a r t i a l l y
applied, w i l l also affect t h e anti-lock system. T h e
idea is t o determine i f a malfunction is a c t u a l l y re-
lated to a n anti-lock component.
I f a v i s u a l inspection and road test do not indicate
the problem cause, component inspection, f a u l t code
identification a n d t e s t i n g w i t h t h e D R B I I w i l l be
necessary.
Page
System Fault Codes
59
SYSTEM FAULT CODES
The microprocessor i n t h e electronic control module
has a self test feature. This feature is activated
whenever t h e i g n i t i o n s w i t c h is i n t h e O n and R u n
positions.
I f a system f a u l t i s detected, t h e control module
w i l l i l l u m i n a t e the anti-lock indicator lamp and store
t h e f a u l t code i n t h e microprocessor memory. I f a
f a u l t code is generated, t h e module w i l l r e t a i n t h e
code after t u r n i n g the i g n i t i o n switch to O f f position.
FAULT
CODE
CAPACITY
The microprocessor memory w i l l store and display
o n l y one f a u l t code a t a t i m e . The stored code can be
displayed b y g r o u n d i n g t h e R W A L diagnostic connec-
tor.
FAULT
CODE
IDENTIFICATION
To determine w h a t t h e f a u l t code is, m o m e n t a r i l y
g r o u n d t h e R W A L diagnostic connector a n d count
t h e n u m b e r of times t h e amber anti-lock indicator
l a m p flashes. F a u l t codes a n d t y p i c a l malfunctions
are o u t l i n e d i n Figure 8. Note t h a t w h e n a f a u l t code
is generated, the red brake w a r n i n g l a m p w i l l also i l -
l u m i n a t e .
The i n i t i a l flash w i l l be a long flash followed b y a
n u m b e r o f short flashes. T h e long flash indicates t h e
b e g i n n i n g o f t h e f a u l t number sequence a n d t h e
short flashes are a c o n t i n u a t i o n o f t h a t
sequence.
Y o u m u s t c o u n t t h e l o n g f l a s h a l o n g w i t h t h e
s h o r t f l a s h e s f o r a n a c c u r a t e f a u l t c o d e c o u n t .
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