Honda Accord 2008 Manual page 1076

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Automatic Transmission
System Description (cont'd)
Electronic Control System (cont'd)
S e l f - d i a g n o s i s
If t h e P C M d e t e c t s t h e f a i l u r e o f a s i g n a l f r o m a s e n s o r , a s w i t c h , a s o l e n o i d v a l v e , o r f r o m a n o t h e r c o n t r o l u n i t , it
s t o r e s a T e m p o r a r y D T C o r a D T C . D e p e n d i n g o n t h e f a i l u r e , a D T C is s t o r e d i n e i t h e r t h e f i r s t o r t h e s e c o n d d r i v e c y c l e .
W h e n a D T C is s t o r e d , t h e P C M b l i n k s t h e D i n d i c a t o r a n d / o r t u r n s o n t h e m a l f u n c t i o n i n d i c a t o r l a m p ( M I L ) b y a s i g n a l
s e n t t o t h e g a u g e c o n t r o l m o d u l e v i a F - C A N .
• O n e D r i v e C y c l e D e t e c t i o n M e t h o d :
W h e n a n a b n o r m a l i t y o c c u r s i n t h e s i g n a l f r o m a s e n s o r , a s w i t c h , a s o l e n o i d v a l v e , o r f r o m a n o t h e r c o n t r o l u n i t , t h e
P C M s t o r e s a D T C f o r t h e f a i l u r e a n d b l i n k s t h e D i n d i c a t o r a n d / o r t u r n s o n t h e M I L i m m e d i a t e l y .
• T w o D r i v e C y c l e D e t e c t i o n M e t h o d :
W h e n a n a b n o r m a l i t y o c c u r s i n t h e s i g n a l f r o m a s e n s o r , a s w i t c h , a s o l e n o i d v a l v e , o r f r o m a n o t h e r c o n t r o l u n i t i n
t h e f i r s t d r i v e c y c l e , t h e P C M s t o r e s a T e m p o r a r y D T C . T h e D i n d i c a t o r a n d t h e M I L d o n o t t u r n s o n a t t h i s t i m e . If t h e
f a i l u r e c o n t i n u e s i n t h e s e c o n d d r i v e c y c l e , t h e P C M s t o r e s a D T C a n d b l i n k s t h e D i n d i c a t o r a n d / o r t u r n s o n t h e M I L .
F a i l - s a f e F u n c t i o n
W h e n a n a b n o r m a l i t y o c c u r s i n t h e s i g n a l f r o m a s e n s o r , a s w i t c h , a s o l e n o i d v a l v e , o r f r o m a n o t h e r c o n t r o l u n i t , t h e
P C M i g n o r e s t h a t s i g n a l a n d s u b s t i t u t e s a p r e - p r o g r a m m e d v a l u e f o r t h e m t h a t a l l o w t h e a u t o m a t i c t r a n s m i s s i o n t o
c o n t i n u e d r i v i n g . T h i s c a u s e s a D T C t o b e s t o r e d a n d t h e D i n d i c a t o r t o b l i n k a n d / o r t h e M I L t o c o m e o n .
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