It really depends on the processor. OBS trucks will usually blink and then go right out while newer trucks will blink, stay on a few seconds, and then go out. As long as the light blinks when turning the key on (and by blink, I mean a really fast single blink), everything should be cool. If it doesn't come on at all or comes on solid (no blink) then there's a PCM issue or chip connection issue.
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