Cummins ISB4.5 CM2150 Fault Code: 2311 PID: SID 18 SPN: 633 FMI: 11 Electronic Fuel Injection Control Valve Circuit – Condition Exists.

Circuit Description
The circuit is a pulse width modulated driver in the engine control module (ECM) that controls the fuel pump actuator. The actuator is grounded in the ECM. The ECM varies the current to this valve to provide the correct fuel flow to the high-pressure pump, based on engine operating conditions. The fuel pump actuator valve is a normally open valve. High circuit resistance can cause fuel pressure to be higher than commanded at light loads.

Component Location
The fuel pump actuator valve is located on the engine-mounted fuel pump housing.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault Codes
This fault is set when the fuel pump actuator circuit has intermittent circuit problems, or the fuel pump actuator resistance it too high or low.

Action Taken When the Fault Code is Active
-The ECM illuminates the amber CHECK ENGINE light and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
-Sensed fuel rail pressure will not follow the commanded rail pressure.

Conditions for Clearing the Fault Code
-To validate the repair, start the engine and let it idle for 1 minute.
-The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
-The ECM will turn off the MIL after 3 consecutive ignition cycles that the diagnostic runs and passes.
-This fault code and MIL can also be cleared with INSITE™ electronic service tool.

Shop Talk
If this fault code occurs during a road test, verify that all connectors are clean and free of corrosion before replacing components.

Possible Causes
-Fuel pump actuator high resistance
-Engine harness high resistance
-Loose, worn, or corroded connectors or pins at the fuel pump actuator or ECM connectors
-Fuel pump actuator with low internal resistance
-Fuel pump actuator or engine harness that has shorted to ground
-Intermittent circuit malfunctions that cause the fuel pressure to exceed the fuel rail pressure relief valve opening pressure.

If an intermittent electrical circuit problem of the fuel pump actuator circuit exists, it is possible for the fault code to become active then inactive during normal engine operation. For example, if a poor connection causes an intermittent open or short circuit, the normally open valve will open in a fraction of a second while the circuit is faulty, causing the fuel rail pressure relief valve to open. Following the event that caused the fuel rail pressure relief valve to open, the ECM will attempt to reset the fuel rail pressure relief valve, provided the fuel pump actuator circuit is not still faulty.