The intake manifold pressure sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active.
1)Open return circuit in the engine harness, connectors, or sensor2)Signal wire shorted to sensor supply or battery voltage.
1)Replace the intake manifold pressure sensor.2)Replace the ECM3)Repair or replace the engine harness.
Cummins ISX11.9 CM2250 (2010-12) Fault Code: 111 PID: SID 254 SPN: 629 FMI: 12 Engine Control Module Critical Internal Failure- Bad Intelligent Device or Component
Cummins ISX11.9 CM2250 (2010-12) Fault Code: 6595 PID: SPN: 190 FMI: 11 Engine Speed- Root Cause Not Known
Cummins ISX11.9 CM2250 (2010-12) Fault Code: 6422 PID: SPN: 1073 FMI: 4 Engine Brake Actuator Driver Output 2 Circuit- Voltage Below Normal or Shorted to Low Source
Cummins ISX11.9 CM2250 (2010-12) Fault Code: 6421 PID: SID 254 SPN: 1073 FMI: 3 Engine Brake Actuator Driver Output 2 Circuit- Voltage Above Normal or Shorted to High Source
Cummins ISX11.9 CM2250 (2010-12) Fault Code: 6419 PID: SPN: 1072 FMI: 4 Engine Brake Actuator Driver 1 Circuit- Voltage Below Normal or Shorted to Low Source
Cummins ISX11.9 CM2250 (2010-12) Fault Code: 6418 PID: SPN: 1072 FMI: 3 Engine Brake Actuator Driver 1 Circuit- Voltage Above Normal or Shorted to High Source