Cummins ISB CM850 (2003-06) Fault Code: 2349 PID: SID 146 SPN: 2791 FMI: 5 EGR Valve Control Circuit – Current Below Normal or Open Circuit. High voltage or open circuit detected at the EGR valve motor circuit.

Cummins ISB CM850 (2003-06) Fault Code: 2349 PID: SID 146 SPN: 2791 FMI: 5 EGR Valve Control Circuit – Current Below Normal or Open Circuit. High voltage or open circuit detected at the EGR valve motor circuit.

The ECM monitors the voltage level of this circuit and logs a fault code if the voltage level indicates an open circuit or if a short circuit to voltage source is present. This fault is always set inactive when the keyswitch is turned on. If the fault condition reoccurs while the keyswitch is in the ON position, the fault code will be set active. Since active faults are set inactive at key ?ON,? this troubleshooting tree should be used to troubleshoot active and inactive faults.

Possible causes:

1)EGR valve motor output (+) or (-) leads shorted to a voltage source in the engine harness or ECM
2)An open circuit in the engine harness, connectors, motor, or ECM.

NOTE: Do not supply voltage of any kind to the EGR valve motor. This circuit uses a pulse-width-modulated signal and direct voltage can permanently damage the motor.

Possible repairs:

1)Replace the EGR valve assembly.
2)Repair or replace the engine harness.
3)Replace the ECM.
4)The removal and installation of the connector may correct the problem.