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Cummins ISX CM870 (2003-06) Fault Code: 434 PID: S251 SPN: 627 FMI: 2/2 Power Lost Without Ignition OFF.
This fault is set active if the ECM battery supply voltage drops below 6.2 volts while the keyswitch is in the ON position.
Make sure the ECM unswitched battery supply is coming directly from the battery and not the starter. If unswitched power is coming from the starter, it is possible for the battery voltage to drop low enough during cranking to set this fault active.
This fault can also be caused by resistance in the ECM battery supply (+) or (-) circuits. Resistance in these circuits can cause the voltage level at the ECM input to drop low enough to set Fault Code 434 active.
Possible repairs:
1)Tighten the connections.2)Charge or replace the battery.3)Repair or replace the OEM power harness.4)Install the fuse correctly.5)Repair or replace the ECM power harness.
Cummins ISX CM870 (2003-06) Fault Code: 433 PID: P102 SPN: 102 FMI: 2/2 Intake Manifold Pressure Sensor Circuit – Data Incorrect. An error in the intake manifold pressure signal was detected by the ECM.
Cummins ISX CM870 (2003-06) Fault Code: 432 PID: S230 SPN: 558 FMI: 13/13 Accelerator Pedal Idle Validation Circuit – out of calibration. Voltage at idle validation on-idle and off-idle circuit does not match accelerator pedal position.
Cummins ISX CM870 (2003-06) Fault Code: 431 (SSS) PID: S230 SPN: 558 FMI: 2/2 Accelerator Pedal Idle Validation Circuit – data incorrect. Voltage detected simultaneously on both idle validation and off-idle validation switches.
Cummins ISX CM870 (2003-06) Fault Code: 431 (ISS) PID: S230 SPN: 558 FMI: 2/2 Accelerator Pedal Idle Validation Circuit – data incorrect. Voltage detected simultaneously on both idle validation and off-idle validation switches.
Cummins ISX CM870 (2003-06) Fault Code: 431 (NISS) PID: S230 SPN: 558 FMI: 2/2 Accelerator Pedal Idle Validation Circuit – data incorrect. Voltage detected simultaneously on both idle validation and idle validation off-idle validation switches.
Cummins ISX CM870 (2003-06) Fault Code: 429 PID: P097 SPN: 97 FMI: 4/4 Water-in-Fuel Indicator Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at the water-in-fuel circuit.