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Cummins ISM CM875 (2003-06) Fault Code: 546 PID: P094 SPN: 94 FMI: 3/3 Rail Fuel Pressure Sensor Circuit – shorted high. High signal voltage detected at the rail fuel pressure circuit.

The rail fuel 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. Before troubleshooting fault code 546, check for multiple faults.

Possible causes:

1)Open return circuit in the engine harness, connectors, or sensor.2)Signal circuit shorted to sensor supply or battery voltage.3)Sensor supply circuit shorted to battery voltage.

Possible repairs:

1)Replace the rail fuel pressure sensor.2)ir or replace the engine harness.3)Replace the ECM.

Cummins ISM CM875 (2003-06) Fault Code: 486 PID: P129 SPN: 1349 FMI: 1/18 Injector Metering Rail Number 2 Fueling Low – WarningAn unexpectedly low fuel delivery was detected on the rear three cylinders.
Cummins ISM CM875 (2003-06) Fault Code: 482 PID: P094 SPN: 94 FMI: 1/18 Fuel Pressure Low – Data Valid But Below Normal Operating Range – Moderately Severe Level.
Cummins ISM CM875 (2003-06) Fault Code: 449 PID: P094 SPN: 94 FMI: 0/16 Fuel Pressure High – Warning. High fuel pressure was detected at the fuel rail in the IFSM.
Cummins ISM CM875 (2003-06) Fault Code: 443 PID: S221 SPN: 1043 FMI: 4/4 Accelerator Pedal Position Sensor Supply Voltage Circuit – shorted low. Low voltage detected at sensor supply circuit to the accelerator pedal position sensor.
Cummins ISM CM875 (2003-06) Fault Code: 435 PID: P100 SPN: 100 FMI: 2/2 Engine Oil Pressure Sensor Circuit – data incorrect. An error in the engine oil pressure sensor signal was detected by the ECM.
Cummins ISM CM875 (2003-06) Fault Code: 434 PID: S251 SPN: 627 FMI: 2/2 Power Lost Without Ignition OFF. Supply voltage to the ECM fell below 6.2 volts momentarily, or the ECM was not allowed to power down correctly (retain battery voltage for 30 seconds after key OFF).