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The PCM sends the power to the relay's coil telling it to activate. Trying to find in the factory service manual a diagnosis procedure but it doesn't seem to have one for fuel pump operation.
If everything runs when you force the relay to provide power, then it's unlikely that the PCM is trying to prevent the car from starting, so the problem is possibly physical (wiring/connection shorted out/corroded somehow). Could install a switch that goes to the relay's wire and manually turn it on, acts as a security measure too lol.
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