Cummins ISB CM850 (2003-06) Fault Code: 298 PID: 223 SPN: 1388 FMI: 4 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Above Normal, or Shorted to High Source. High signal voltage detected at the OEM pressure circuit.
Cummins ISB CM850 (2003-06) Fault Code: 298 PID: 223 SPN: 1388 FMI: 4 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Above Normal, or Shorted to High Source. High signal voltage detected at the OEM pressure circuit.
Possible causes:
1)Open return circuit in the harness, connectors, or sensor.
2)signal circuit shorted to sensor supply or battery voltage.
Possible repairs:
1)Replace the OEM pressure sensor.
2)Replace the ECM.
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