General Troubleshooting Information - Honda Accord 2008 Manual

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General Troubleshooting Information
Intermittent Failures
How to Use the HDS (Honda Diagnostic
System)
T h e t e r m i n t e r m i t t e n t f a i l u r e m e a n s a s y s t e m m a y h a v e
h a d a f a i l u r e , b u t it c h e c k s O K n o w . C h e c k f o r p o o r
c o n n e c t i o n s o r l o o s e t e r m i n a l s a t a l l c o n n e c t o r s r e l a t e d
t o t h e c i r c u i t t h a t y o u a r e t r o u b l e s h o o t i n g .
1. C o n n e c t t h e H D S t o t h e d a t a l i n k c o n n e c t o r (DLC)
(A) l o c a t e d u n d e r t h e d r i v e r ' s s i d e o f t h e d a s h b o a r d .
Opens and Shorts
O p e n a n d s h o r t a r e c o m m o n e l e c t r i c a l t e r m s . A n o p e n
is a b r e a k i n a w i r e o r a t a c o n n e c t i o n . A s h o r t is a n
a c c i d e n t a l c o n n e c t i o n o f a w i r e t o g r o u n d o r t o a n o t h e r
w i r e . In s i m p l e e l e c t r o n i c s , t h i s u s u a l l y m e a n s
s o m e t h i n g w o n ' t w o r k a t a l l . W i t h c o m p l e x e l e c t r o n i c s
( s u c h a s P C M s ) t h i s c a n s o m e t i m e s m e a n s o m e t h i n g
w o r k s , b u t n o t t h e w a y i t ' s s u p p o s e d t o .
A
2. T u r n t h e i g n i t i o n s w i t c h t o O N (II).
3. M a k e s u r e t h e H D S c o m m u n i c a t e s w i t h t h e v e h i c l e
a n d t h e p o w e r t r a i n c o n t r o l m o d u l e ( P C M ) . If it d o e s
n o t c o m m u n i c a t e , t r o u b l e s h o o t t h e D L C c i r c u i t
( s e e p a g e 1 1 - 2 5 9 ) .
4 . C h e c k t h e d i a g n o s t i c t r o u b l e c o d e ( D T C ) a n d n o t e it.
A l s o c h e c k t h e f r e e z e d a t a a n d / o r o n - b o a r d
s n a p s h o t d a t a , a n d d o w n l o a d a n y d a t a f o u n d . T h e n
r e f e r t o t h e i n d i c a t e d D T C s t r o u b l e s h o o t i n g , a n d
b e g i n t h e a p p r o p r i a t e t r o u b l e s h o o t i n g p r o c e d u r e .
N O T E :
• F r e e z e d a t a i n d i c a t e s t h e e n g i n e c o n d i t i o n s w h e n
t h e f i r s t m a l f u n c t i o n , w a s d e t e c t e d .
• T h e H D S c a n r e a d t h e D T C , f r e e z e d a t a , o n - b o a r d
s n a p s h o t , a n d c u r r e n t d a t a a b o u t t h e a c t i v e
c o n t r o l e n g i n e m o u n t ( A C M ) s y s t e m .
• F o r s p e c i f i c o p e r a t i o n s , r e f e r t o t h e u s e r ' s
m a n u a l t h a t c a m e w i t h t h e H D S .
( c o n t ' d )
4-65

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