First i suggest you to click this link and understand the problem,more briefly,then follow this later part of diagrams:-----
Possible causes are : poor connection, open or short in control circuit, faulty PCM.
The ECM is located on the right side of the dash. Here is a picture to help you find it.
This will help.
Thanks.
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http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html