Are you positive the fan itself work?
To eliminate the relay and fan I would personally jump the two of them. If you look at the relay it should have a wiring diagram on it but i think you are jumping terminal 87 and 30 IIRC.
I don't know if that car uses one or two temp sensors but you can have a faulty sensor
Check ground connections to for the fan also.
I would check the entire system before looking into the PCM unless you have already done so.
What have you checked?
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2000 Camaro SS 610rwhp/570rwtq LS2 440, 12 bolt 3.73, tranzilla t56
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