Cummins ISB CM850 (2003-06) Fault Code: 523 PID: 89 SPN: 611 FMI: 2 Auxiliary Intermediate (PTO) Speed Switch Validation – Data Erratic, Intermittent, or Incorrect. The position of the intermediate speed control switch 1 does not match the position of the intermediate speed control validation switch.
When activated by switch or hand throttle, the Intermediate Speed Control feature governs engine speed to the corresponding preset speed. The three preset speeds can be adjusted with an increment or decrement switch but can not exceed the low or high idle governor engine speed limits.
If Intermediate Speed Control validation is being use, Intermediate Speed Control Switched Set Speed Three will be used as the validation input.
1)Replace the intermediate speed control switch.
2)Repair or replace the OEM harness.
Cummins ISB CM850 (2003-06) Fault Code: 499 PID: 98 SPN: 98 FMI: 4 Engine Oil Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source. The engine oil level sensor has detected an internal failure.
Cummins ISB CM850 (2003-06) Fault Code: 498 PID: 98 SPN: 98 FMI: 3 Engine Oil Level Sensor Circuit – Voltage Above Normal or Shorted to High Source. The engine oil level sensor has detected an internal failure.
Cummins ISB CM850 (2003-06) Fault Code: 497 PID: SID 114 SPN: 1137 FMI: 2 Multiple Unit Synchronization Switch – Data Erratic, Intermittent, or Incorrect. Multi-Unit synchronous ON/OFF switch and Multi-Unit synchronous complimentary ON/OFF switch have different values in the ECM.
Cummins ISB CM850 (2003-06) Fault Code: 488 PID: 105 SPN: 105 FMI: 0 Intake Manifold 1 Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level. Intake manifold air temperature signal indicates intake manifold air temperature above engine protection warning limit.
Cummins ISB CM850 (2003-06) Fault Code: 471 PID: 98 SPN: 98 FMI: 17 Engine Oil Level ? Data Valid But Below Normal Operational Range ? Least Severe Level. Low oil level has been detected by the oil level sensor.
Cummins ISB CM850 (2003-06) Fault Code: 452 PID: 157 SPN: 157 FMI: 4 Injector Metering Rail Number 1 Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the rail fuel pressure sensor circuit.
