Cummins ISB CM850 (2003-06) Fault Code: 2346 (ISC) PID: SPN: 2789 FMI: 15 Turbocharger Turbine Inlet Temperature (Calculated) – Data Valid but Above Normal Operational Range – Least Severe Level. Turbocharger turbine inlet temperature has exceeded the engine protection limit.
The most common cause of this fault code is low boost. Low boost can be caused by several factors: leaking charge air cooler, failed charge air cooler piping or hose, loose charge air cooler clamps, failed intake manifold pressure sensor, failed variable geometry turbocharger, or failed turbocharger control valve.
NOTE: This code will most likely not be active with no load in the shop. The engine must be loaded to trip this fault code and to determine if the failure has been found and fixed.
1)Replace the turbocharger.
2)Repair the air supply from the OEM air tanks.
3)Replace the turbocharger control valve.
4)Replace the turbocharger actuator.
Cummins ISB CM850 (2003-06) Fault Code: 2346 (ISB) PID: SPN: 2789 FMI: 15 Exhaust gas temperature – data above normal. High exhaust temperature has been calculated by the electronic control system.
Cummins ISB CM850 (2003-06) Fault Code: 2345 (ISC) PID: 103 SPN: 103 FMI: 10 Turbocharger Speed Invalid Rate of Change Detected – Abnormal Rate of Change. The turbocharger speed sensor has detected an erroneous speed value.
Cummins ISB CM850 (2003-06) Fault Code: 2345 (ISB) PID: 103 SPN: 103 FMI: 10 Turbocharger speed – invalid rate of change detected. The turbocharger speed sensor has detected an erroneous speed value.
Cummins ISB CM850 (2003-06) Fault Code: 2322 PID: SID 64 SPN: 723 FMI: 2 Backup Engine Speed/Position Sensor Number 2 – Data Erratic, Intermittent, or Incorrect. Camshaft engine speed sensor intermittent synchronization.
Cummins ISB CM850 (2003-06) Fault Code: 2321 PID: 190 SPN: 190 FMI: 2 Engine Crankshaft Speed/Position – Data Erratic, Intermittent, or Incorrect. Crankshaft engine speed sensor intermittent synchronization.
Cummins ISB CM850 (2003-06) Fault Code: 2311 PID: SID 81 SPN: 633 FMI: 11 Fueling Actuator Number 1 Circuit Error Conditions Exists. Fuel pump actuator circuit resistance too high or too low.
