99 tahoe service engine soon not functioning why?

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temsky510

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Ok, so about a year ago the S.E.S. light came on and of course i ignored it for a few months(2) and it went away. My thoughts "oh nothing was wrong" Anyways last month registration was up and smog was needed, so i took it in for a smog check and it didnt pass because of a functional issues...S.E.S. light not showing upon start up. So i replaced the bulb but it no longer comes on at all. I tried changing it twice. The original bulb was brunt out i guess from being on those 2months. Before I take it to a shop and charged an arm and a leg I ask for some help.
 
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SunlitComet

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check condition of fuse #4 "gauges".

---------- Post added at 07:42 PM ---------- Previous post was at 07:38 PM ----------

if fine disconnect connector on pcm called black and ground pin #5 turn ignition on if it lites up but not when pcm is plugged back in then pcm is at fault.
 

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