Cummins ISB CM850 (2003-06) Fault Code: 431 (SSS) PID: SID 230 SPN: 558 FMI: 2 Accelerator Pedal or Lever Idle Validation Circuit – Data Erratic, Intermittent or Incorrect. Voltage detected simultaneously on both idle validation and off-idle validation switches. Possible causes: 1)This fault code is usually caused by an open circuit on either the idle validation on-idle or off-idle signal circuit, a loose connection, uncalibrated accelerator pedal or lever assembly, or miswired idle validation switch.2)The integrated sensor switch (ISS) has a different internal resistance specification (125 ohms) than the nonintegrated sensor switch (NISS).3)When installing a new accelerator pedal or lever...

Cummins ISB CM850 (2003-06) Fault Code: 432 PID: SID 230 SPN: 558 FMI: 13 Accelerator Pedal or Lever Idle Validation Circuit – Out of Calibration. Voltage at idle validation on-idle and off-idle circuit does not match accelerator pedal position. This fault is logged when both the on idle and off idle validation switches disagree with the accelerator pedal or lever position signal. Turning the keyswitch ON while partially depressing the accelerator pedal or lever can cause this fault code to go active. This fault will stay active until the pedal or lever is cycled through its full travel. Possible repairs:...

Cummins ISB CM850 (2003-06) Fault Code: 433 PID: 102 SPN: 102 FMI: 2 Intake manifold pressure sensor circuit – data incorrect. An error in the intake manifold pressure sensor signal was detected by the ECM. At key-on, before the engine is started, the readings for intake manifold pressure, barometric pressure, and exhaust pressure are compared. This fault code occurs if the intake manifold pressure sensor reading is different from the other three. This check is only done once after the keyswitch is turned on. Possible repairs: 1)Replace the intake manifold pressure sensor. Cummins ISB CM850 (2003-06) Fault Code: 432 PID:...

Cummins ISB CM850 (2003-06) Fault Code: 434 PID: SID 251 SPN: 627 FMI: 2 Power Supply Lost With Ignition On – Data Erratic, Intermittent or Incorrect. Supply voltage to the ECM fell below 6.2 VDC momentarily, or the ECM was not allowed to power down correctly (retain battery voltage for 30 seconds after key OFF). This fault is set active if the ECM battery supply voltage drops below 6.2 VDC 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...

Cummins ISB CM850 (2003-06) Fault Code: 435 PID: 100 SPN: 100 FMI: 2 Oil Pressure Switch Sensor Circuit – Data Erratic, Intermittent or Incorrect. An error in the engine oil pressure switch signal was detected by the ECM. The oil pressure switch is closed with the engine not running and open when oil pressure is present. This fault code is logged when an open circuit is detected for five consecutive key cycles when the ECM expected a closed circuit at key-on. Possible causes: 1)Failed engine oil pressure switch2)Open circuit in the engine oil pressure switch signal wire3)Failed ECM4)Short circuit in...