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Vipec v88 ecu volt 18v


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That would most commonly be caused by the main power supply missing (a blown fuse or similar).  With no connection to the battery any flyback voltage from inductive devices cannot be dumped back to battery so the internal voltage gets "pumped up".  Asuming it is a wire-in ecu, unplug the ecu, turn on ignition and confirm there is 14V on pin A5.

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