Cummins ISB CM850 (2003-06) Fault Code: 1639 PID: SID 51 SPN: 703 FMI: 11 Auxiliary Equipment Sensor Input Number 3 (OEM Switch) - Root Cause Not Known.

This fault code is activated when the maximum inlet temperature or inlet pressure of a third party after-treatment system has exceeded the maximum allowable limits. A power derate may or may not be associated with this fault code.

Possible repairs:

1)Replace the ECM.
2)Repalce the OEM harness.

Cummins ISB CM850 (2003-06) Fault Code: 1633 PID: SPN: 625 FMI: 2 Komnet Datalink Cannot Transmit - Data Erratic, Intermittent, or Incorrect. Communications within the OEM datalink network is intermittent.

Cummins ISB CM850 (2003-06) Fault Code: 1242 PID: SPN: 91 FMI: 2 Accelerator Pedal or Lever Position Sensor Number 1 and Number 2 - Data Erratic, Intermittent, or Incorrect. Accelerator position sensors numbers 1 and 2 are reading different values.

Cummins ISB CM850 (2003-06) Fault Code: 1241 PID: SPN: 2623 FMI: 4 Accelerator Pedal or Lever Position Sensor 2 Circuit - Voltage Below Normal or Shorted to Low Source. Low voltage detected at accelerator pedal position number 2 signal circuit.

Cummins ISB CM850 (2003-06) Fault Code: 1239 PID: SPN: 2623 FMI: 3 Accelerator Pedal or Lever Position Sensor 2 Circuit - Voltage Above Normal or Shorted to High Source. High voltage detected at accelerator pedal position number 2 signal circuit.

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