5-volt reference, ground and signal wire (pressure voltage signal), which sends the reading to the ECM / PCM. The rail pressure sensor has a 3-wire connection. Sprinter & Jeep rail pressure sensor should read as noted below A skewed rail pressure reading will not cause a hard start. If the rail pressure sensor fails, the ECM will substitute a default value.ĭuramax ( diagnostics) 6.6 LB7 & LLY KOEO (Key On Engine Off) rail pressure sensor should read 145 – 261 psi (1.0-1.8 Mpa) LBZ & LMM Duramax KOEO should be 0 psi. P0191 Fuel Rail Pressure Performance could be a bad rail pressure sensor or reporting that the rail pressure is too low. In this article, you will find fuse box diagrams of GMC Topkick 2006, 2007, 20, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay. The CP4 pump is found on the LML, Which was 2011-2016. The medium duty truck GMC Topkick was produced from 2003 to 2010. To the OP, yes I agree you are at the time to be considering a fuel pump. 6.7 L ( no start hard start diagnostic) rail pressure sensor. Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts. If the connector tubes do not seat or the injectors have too much internal leakage, which returns to the tank, then the pump cannot produce enough pressure for starting.ĭodge / Ram / Cummins – 5.9 L ( no start hard start diagnostic) rail pressure KOEO (Key On, Engine Off) should be 0 +/- 500psi. A fuel supply side restriction will also cause low rail pressure. Depending on the system, it is up to the high pressure limit valve, injector connector tubes, fuel pressure control solenoid and injectors to hold leakage and allow the pressure to build.

The high pressure pump creates high pressure at low volume. If the rail pressure is low, then it will report low rail pressure, and low rail pressure is normally caused by different problems. A rail pressure sensor reports what the rail pressure is.

Rail pressure sensors, unless skewed or setting a circuit code, will not cause a no start or low rail pressure. Will the rail pressure sensor cause low rail pressure and a slow or no start?

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