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The pump will shut down if it detects an overcurrent or overheat condition. For the fault to appear after 10s, either the pump is drawing over 100A or the motor temperature sensor has exceeded 200C.

The same will happen if the ECU detects that the motor voltage is much less than the supply voltage, this is quite likely your fault, as it will trip after 10s. The fault could either be in the ECU (switch open circuit) or the motor (short).

Another fault is that the ECU will shut down the system if the control power is lost. It might be worth checking that there is voltage on pin 1 (Black/Red wire) of the ECU

It's not the speed signal as the car has to be moving (over 12 mph) for that to trip

If you short pins 4 and 13 on the diagnostic connector and then turn on the ignition, after 4 seconds, the PS light will flash to indicate the fault code. They are 2 digit. Count the short flashes for each digit, the medium sized gap is between digits and the longer gap is between codes. Lowest number code is output first