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View Full Version : FRP%Commanded is opposite of Desired Pressure


Hambone
January 2nd, 2025, 03:42 PM
07.5 LMM (Losing My Mind / Less Money Monthly) with chronic P0087. Have been through the physical checks, finally noticed the FRP commanded % decreases (along with the rail pressure) whenever I step on the throttle. At WOT, its at 11 or 12% and the rail pressure is missing 10K PSI. Isn't the commanded % supposed to follow the Desired Rail Pressure? The TPS PID wasn't working, but when the APP_ PID shows 84%, thats my foot all the way to the floor. If anyone has some insight on this, I'd be very thankful!

Happy New Year!
WyoFreeride
January 2nd, 2025, 04:20 PM
Lower duty cycle = higher pressure. An unplugged FCA causes the cp3 to make full pressure, which will vary with RPM

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Hambone
January 3rd, 2025, 06:09 AM
Lower duty cycle = higher pressure. An unplugged FCA causes the cp3 to make full pressure, which will vary with RPM

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Ah, ok... so by unplugging the FCA, the duty cycle would become 0%, calling for full pressure? Guess I need to run more logs.