Cummins ISB CM850 (2003-06) Fault Code: 2273 PID: 411 SPN: 411 FMI: 3 EGR valve differential pressure sensor circuit – shorted high. High voltage detected on the EGR differential pressure sensor circuit. The EGR differential pressure sensor shares supply and return wires in the engine harness with other sensors. Open circuits and short circuits in the engine harness can cause multiple fault codes to be active. Before troubleshooting Fault Code 2273, check for multiple faults. Possible causes: 1)Open return in the harness, connectors, or sensor2)Signal circuit shorted to sensor supply or battery voltage3)Supply circuit shorted to battery voltage. Possible repairs:...

Cummins ISB CM850 (2003-06) Fault Code: 2274 PID: 411 SPN: 411 FMI: 4 EGR valve differential pressure sensor circuit – shorted low. Low signal voltage detected on the EGR valve differential pressure sensor circuit. The EGR valve differential pressure sensor shares supply and return wires in the engine harness with other sensors. Open circuits and short circuits in the engine harness can cause multiple fault codes to be active. Before troubleshooting Fault Code 2274, check for multiple faults. Possible causes: 1)Open signal circuit in the engine harness, connections, or sensor2)Supply circuit open or shorted to ground3)Sensor shorted to ground. Possible...

Cummins ISB CM850 (2003-06) Fault Code: 2292 PID: SPN: FMI: 16 Fuel Inlet Meter Device – Data Valid but Above Normal Operational Range – Moderately Severe Level. The flow demand is higher than expected. Causes of this fault code include the following: High inlet restriction, plugged fuel filter, low lift pump pressure, low resistance to the electronic fuel control actuator, stuck or restricted electronic fuel control actuator, system return (excessive return flow from the injectors, high-pressure pump, or rail pressure relief valve), or tampering. Fault Code 2292 sets when the ECM commands the electronic fuel control actuator to open more...

Cummins ISB CM850 (2003-06) Fault Code: 2293 PID: SPN: FMI: 18 Fuel inlet meter device flow demand lower than expected – data valid but below normal operational range – moderately severe level. The flow demand is lower than expected. Fault Code 2293 is activated when the electronic fuel control actuator is closed more than expected to lower rail fuel pressure. An electric fuel control actuator with excessive leakage can possibly result in high rail fuel pressures at idle or light load. A restriction in the fuel-drain-to-tank return line can prevent unneeded fuel from exiting the high-pressure fuel pump. This excess...

Cummins ISB CM850 (2003-06) Fault Code: 2311 PID: SID 81 SPN: 633 FMI: 11 Fueling Actuator Number 1 Circuit Error Conditions Exists. Fuel pump actuator circuit resistance too high or too low. If this fault code occurs during road test or sea trial, verify that all connectors are clean and free of corrosion before replacing components. This fault code can become active for any of the following reasons: 1)Fuel pump actuator high resistance2)Engine harness high resistance3)Loose, worn, or corroded connectors or pins4)Fuel pump actuator with low internal resistance5)Fuel pump actuator or engine harness that has shorted to ground6)Intermittent circuit failures...