Cummins X15 CM2350 X116B Performance Series (2018 & Newer) Fault Code: 4727 PID: SPN: 157 FMI: 15 Injector Metering rail 1 Pressure- Data Valid But Above Normal Operating Range- Least Severe Level
Circuit Description
The engine control module (ECM) provides a 5 volt supply to the fuel rail pressure sensor using a dedicated sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The fuel rail pressure sensor provides a primary fuel pressure signal to the ECM on the fuel rail pressure sensor signal 1 circuit. The sensor also provides a secondary fuel pressure sensor signal on the fuel rail pressure signal 2 circuit. This sensor signal voltage changes based on the pressure in the fuel rail. The ECM will detect a high signal voltage at high rail pressure conditions. The ECM will detect a low signal voltage during low rail pressure conditions.
Component Location
The high-pressure fuel pump is mounted to the gear housing. The fuel pump actuator is mounted on the fuel pump. The fuel pressure sensor is mounted in the high pressure fuel rail. The fuel pressure relief valve is mounted on the high pressure fuel rail.
Conditions for Running the Diagnostics
This diagnostic runs periodically during engine operation.
Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the fuel rail pressure was increasing during motoring (non-fueling) conditions where the pressure should have been stable.
Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code
It is necessary to use the “Reset All Faults” command in INSITE™ electronic service tool to clear this fault and extinguish the amber CHECK ENGINE lamp and/or Malfunction Indicator Lamp (MIL).
Shop Talk
Possible causes of this fault code include:
High fuel drain line restriction
A plugged fuel pump actuator mounting adapter
Possible Cause:
1) ECM calibration
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