Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
2006 Corolla GLI hard start and no communication with DLC
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Here is a link for the DIY version of the service info I use. It costs $20 to access everything you need for you car
eautorepair.adtrk.biz/?a=10817&c=24&p=r&s1=