Dreaded P0192 code. Fuel issue

Discussion in 'Mazdaspeed 6 Troubleshooting' started by MS6 P.C., Oct 12, 2021 at 10:24 AM.

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  1. MS6 P.C.

    MS6 P.C. Gold Member

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    So after installing a new (built) motor, can't seem to get this P0192 code figured out. Fuel rail pressure sensor circuit low input. From what I read, it means fuel pressure isn't hitting the desired target. I do have port injection that is T'd at the hpfp, but I am gettin fuel from the hose coming off the firewall.

    Replaced fprv with parts car and worked for 2 drive cycles (approx 8 miles). Then bought new one from Mazda, no luck. Swapped spill valve off parts car, no luck. Swapped pressure sensor off parts car, no luck. Pulled hpfp with Autotech's and installed stock hpfp with no luck.

    I think it has to be a wiring issue because sometimes it will read, and then will not. I will attach some logs for those who want to look. I find it odd though that sometimes the afr will be pegged at 14.85 when the car is running (log 308). One of the logs show the car running with no pressure (log 309). I'm not good at diagnosing electrical issues, that's why I came here for help. I checked the wires going to the sensor (I should note I have Eric's wire tuck), checked the wires at the fuse box under the hood and can't find anything that looks damaged. Unplugged and plugged stuff back in. Tried cleaning connectors and pins on that sensor and the plug by the fuse box. I have a multimeter but have never used it and not sure how to check the voltages properly.
    Logs 315 and 316 are what it does now, which is not run, and if it starts, it quickly dies.
     

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    MS6 P.C., via a Samsung mobile device, Oct 12, 2021 at 10:24 AM
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  2. JohnnyTightlips

    JohnnyTightlips Motorhead Silver Member

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    Double check you fuel rail pressure sensor plug, it might not have snapped in all the way "I have had that issue". When the car starts I don't see any pressure being registered. Double check your ground wires too. Try having a friend wiggle the harness while you start the car to see if that changes anything.

    https://www.revisionsrus.com/logs/2177

    upload_2021-10-12_16-50-44.png
     
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  3. MS6 P.C.

    MS6 P.C. Gold Member

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    Thanks. I'm sure it's in there good as I unplugged it and plugged it in a few times. Plug and sensor look good to the eye, or my eye at least.

    It's to the point where the car shows no fuel pressure, where as before, it seemed like it would come and go, like in log 309, making me believe I have a loose connection somewhere.

    I remember putting the ground back on at the hpfp, the starter, the passenger motor mount, and power steering pump. Talking to a friend, first thing he suggested was a ground. Then he came to the conclusion it was my prv, which I then replaced

    I should note that when I first started the car I was getting a few codes
    Maf high circuit
    Iat high circuit
    Fuel rail low circuit
    No communication with ABS module
    Instrument cluster not receiving ortransmiting on can bus

    First two were remedied by replacing maf from parts car. After checking into wiring and the connections the last two never came back. Just keep having the fuel rail low circuit stay and the car no longer runs.

    Thanks for the advice, I'll continue to dig...
    Does anyone know if the abs module, fp sensor or o2 use any of the same grounds?
     
    MS6 P.C., via a Samsung mobile device, Oct 12, 2021 at 9:13 PM
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