Cummins ISB CM850 (2003-06) Fault Code: 554 PID: 157 SPN: 157 FMI: 2 Injector Metering Rail 1 Pressure – Data Erratic, Intermittent, or Incorrect. the ECM has detected that the fuel pressure signal is not changing.
This fault code can become active any time the engine is loaded and the electronic control module (ECM) detects the fuel pressure in the rail fuel is not changing. This fault code will become inactive whenever the ECM is powered down or if the ECM detects that the engine is loaded and the fuel pressure is changing normally. If there are many inactive counts of this fault code or if the fault is not repeatable, look for signs of tampering to the fuel pressure sensor circuit. If the fault code occurs intermittently (can not be reproduced during a road test), then inspect each of the following for poor connections or damage:
1)Replace the rail fuel pressure sensor.
2)Repair or replace the engine harness.
3)Replace the ECM.
Cummins ISB CM850 (2003-06) Fault Code: 553 PID: 157 SPN: 157 FMI: 0 Injector Metering Rail 1 Pressure – Data Valid but Above Normal Operational Range – Moderately Severe Level. The ECM has detected that fuel pressure is higher than commanded pressure.
Cummins ISB CM850 (2003-06) Fault Code: 551 (SSS) PID: SID 230 SPN: 558 FMI: 4 Accelerator Pedal or Lever Idle Validation Circuit – Voltage Below Normal or Shorted to Low Source. No voltage detected simultaneously on both the idle validation off-idle and on-idle circuits.
Cummins ISB CM850 (2003-06) Fault Code: 551 (NISS) PID: SID 230 SPN: 556 FMI: 4 Accelerator Pedal or Lever Idle Validation Circuit – Voltage Below Normal or Shorted to Low Source. No voltage detected simultaneously on both the idle validation off-idle and on-idle circuits.
Cummins ISB CM850 (2003-06) Fault Code: 551 (ISS) PID: SID 230 SPN: 558 FMI: 4 Accelerator Pedal or Lever Idle Validation Circuit – Voltage Below Normal or Shorted to Low Source. No voltage detected simultaneously on both the idle validation and off-idle and on-idle switches.
Cummins ISB CM850 (2003-06) Fault Code: 545 PID: SID 32 SPN: 1188 FMI: 7 Turbocharger 1 Wastegate Control ? Mechanical System Not Responding Properly or Out of Adjustment. Intake manifold pressure has exceeded the maximum limit for the given engine rating.
Cummins ISB CM850 (2003-06) Fault Code: 529 PID: SID 51 SPN: 703 FMI: 3 Auxiliary Input/Output 3 Circuit – Voltage Above Normal, or Shorted to High Source. High signal voltage has been detected at the auxiliary input/output 3 circuit.
