HPFP reads 0v

Discussion in 'Mazdaspeed 3 Troubleshooting' started by Sleepy_Pat, Apr 8, 2019.

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  1. Sleepy_Pat

    Sleepy_Pat Silver Member

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    After a random u2064 code popped up a while back I decided to start looking through different monitors on my ap and noticed that I had 0 voltage to the hpfp sensor. The code went away on its own and has since not come back. However, sometimes on cold starts after a few seconds when the rpms have dropped to around 1200-1500 it will rev back up to 2k for a second then drop back down where it was before. I haven’t had any pressure issues and the car runs normal other than intermittent cold start behavior. I thought maybe a bad ground or frayed wire could be a good place to start but I haven’t found anything that stands out. Any insight would be appreciated!
     
    Sleepy_Pat, via an iPhone, Apr 8, 2019
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  2. Code Monkey

    Code Monkey Silver Member

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    My AP has always showed 0 voltage for HPFP, I think it is a bug in software.
     
  3. Sleepy_Pat

    Sleepy_Pat Silver Member

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    I had a considered that but have also seen threads where people claim that they get anywhere from 1v-5v so I assumed something was up. If it is normal then I’m back to wondering what the u2064 code is
     
    Sleepy_Pat, via an iPhone, Apr 8, 2019
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