That looks like a 7.x configuration. It helps if you state which PIX version you are running.
What exactly are you trying to ping? If you are trying to ping an interface on the PIX itself which is not the "closest" interface, then you cannot do that in 6.x; I don't know about 7.x.
If you are trying to ping a host "beyond" a PIX interface, with the intention that you address the packets to the PIX interface IP and that it would forward the packets to an inside host, then you cannot do that in 6.x because 6.x has no way of configuring icmp forwarding for the interface IP. I don't know if 7.x does.
If you are trying to ping a host "beyond" a PIX interface and that host is to be addressed by its internal IP (as you mentioned nat having been disabled) then the target IP you would want in the access-list would be the internal IP of the target.
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