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47 is as low as I'll go with good batteries and alternator. But you can do whatever works best for you.
From the TSB:
12.Cycle the ignition to off and back to run position to activate the injector pre-cycle. Monitor the FICM_MPWR PID and ensure voltage reading is greater than 45 volts during the entire duration of the last 10 seconds of the fuel injectors clicking.1.If FICM_M power is 45 volts or greater, the PMI repaired the concern. Reassemble the EOT circuits if previously removed. Return vehicle to customer.
2.If FICM_MPWR drops below 45 volts during pre-cycle, reassemble the EOT circuits if removed previously and proceed to FICM Half Shell Replacement procedure.
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