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P2507 Mazda -how do i fix this problem ECM/PCM power input signal low?

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Vehicle is a 2007 Mazda 3 with the MIL indicator 'on'

Vehicle: 2007, Mazda 3, hatchback,1600cc

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P2507 PCM B+ voltage low

Ensure that the battery and charging system is correct , The PCM is protected by a EEC fuse, replace the fuse high resistance in that connection will result with this code condition.

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