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If you have the diagnostic port installed it's normally just a matter of hooking up a scan tool and seeing if it will read it. If only certain parts/circuits are fried (I've seen this on Chrysler ECMs before) than sometimes a base level generic ready is harder to use. I know that a good reader like a DRBIII or newer that a dealership uses has the capability of looking at all of the parameters the ECM controls and therefore would be really easy to see if it was trying to trigger the pump.
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