Cummins ISM CM870 (2003-06) Fault Code: 559 PID: P157 SPN: 157 FMI: 1/18 Injector Metering Rail 1 Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level. The engine control module (ECM) has detected that fuel pressure is lower than commanded pressure.

The ECM estimates the amount of fuel delivered to each bank by monitoring the crankshaft acceleration pattern as it rotates. This fault is set active if the ECM estimates that the front bank is receiving insufficient fuel flow.

Possible repairs:

1)Install the original front fueling actuator.
2)Replace the o-rings.

Cummins ISM CM870 (2003-06) Fault Code: 551 (SSS) PID: S230 SPN: 558 FMI: 4/4 Accelerator Pedal Idle Validation Circuit - data incorrect. No voltage detected simultaneously on both idle validation and off-idle validation switches.

Cummins ISM CM870 (2003-06) Fault Code: 551 (ISS) PID: S230 SPN: 558 FMI: 4/4 Accelerator Pedal Idle Validation Circuit - data incorrect. No voltage detected simultaneously on both idle validation and off-idle validation switches.

Cummins ISM CM870 (2003-06) Fault Code: 551 (NISS) PID: S230 SPN: 558 FMI: 4/4 Accelerator Pedal Idle Validation Circuit - data incorrect. No voltage detected simultaneously on both idle validation and off-idle validation switches.

Cummins ISM CM870 (2003-06) Fault Code: 547 PID: P094 SPN: 94 FMI: 4/4 Rail Fuel Pressure Sensor Circuit - shorted low. Low signal voltage detected at rail fuel pressure circuit.

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