09-24-2019, 12:22 PM | #1 |
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F32 HPFP Code: 11A002 and 11AC02
Hi guys,
I have a 2014 435iX F32 and I got a Drivetrain Malfunction for the code: 11A002 (Fuel Pressure Below Target) and 11AC02 (high-pressure fuel system, cold start: pressure too low) Mods: Aftermarket Chargepipe JB4 CL Downpipe. I can't tell if I need a new HPFP for the gas tank or the one that is inline with the direct injection in the engine bay. It starts up fine, I will get the error code as I'm driving off, it will put me in "limp mode". I try to erase it (Jb4) while I'm driving as well and it just comes back on. Could anyone steer me in the right direction? I'm really hoping it's the one in my gas tank. Or if anyone knows how I can tell the difference of the issue between the HPFP in my gas tank and the HPFP inline with the direct injection inside the engine bay. Kind regards. |
09-24-2019, 05:15 PM | #2 | |
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I had similar codes relating to fuel pressure for months and it ended up being my Walbro 450 LPFP. I did replace my HPFP before that and it didn't fix it, so I'd say replace the pump in the tank first and see if that fixes it. |
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09-24-2019, 06:24 PM | #3 | |
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Thanks again! |
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09-24-2019, 06:40 PM | #4 | |
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According to JB4, FP L: Fuel pressure, low system. Pressure is read on the left hand scale X 10. Otherwise known as the in tank low pressure fuel pump. This value typically ranges from 55-70psi. If dropping below 50psi it indicates a problem with your low fuel pressure pump. Most often that problem is it needs to be augmented with an inline pump to keep up with the higher fuel demands required by ethanol usage. FP H: Fuel pressure, high system. Otherwise known as the high pressure pump. Note all N54 include this and other platforms can only log this if also equipped with the flex fuel connector. This value represents the voltage of the high pressure 0-5V sensor, where a value of 20 is 5v. Each unit of measure is roughly equal to 150psi. Typical values at full throttle are 10-14, or 1500 to 2100psi. Values of less than 900psi as full throttle indicate a fuel delivery problem and the JB4 will failsafe at 700psi at full throttle. Note when not at full throttle a typical value is 5 or 750psi. |
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09-24-2019, 06:51 PM | #5 | ||
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09-24-2019, 07:37 PM | #6 | |
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On the flip side, that's better than replacing the high fuel pump because it looks to be a pain in the ass to do. On the other hand, I'm going to have to find something to unscrew that lock that covers the low pressure pump, since it uses this fancy tool. Maybe I can make something from home to undo the cover. |
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09-24-2019, 07:49 PM | #7 | ||
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09-24-2019, 08:13 PM | #8 | |
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It's on sale for $15 and cost me $12 to ship it lmao. Maybe I can find something in town here..... would hate to half fast this lol. |
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09-24-2019, 08:30 PM | #9 | ||
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09-25-2019, 09:51 AM | #10 |
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JB4 will always show zero for the FPL because
your car's model doesnt have a LPF sensor . It can only read the high pressure value from the sensor at the end of your fuel rail . if im correct , only early n55's with the older style N54hpfp do have a LPF sensor but that wont solve your problem . get a decent mechanic to look at it before replacing parts your not sure about .
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09-25-2019, 11:01 AM | #11 | |
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02-26-2021, 11:01 PM | #13 | |
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