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. This fault becomes active if the engine is running and the turbocharger speed signal rapidly changes faster than the capabilities of the turbocharger. This fault code can be caused by an intermittent turbocharger speed sensor connection, incorrect turbocharger speed sensor air gap, or a faulty turbocharger speed sensor. Possible repairs: 1)Replace the turbocharger speed sensor.2)The removal and installation of the connector may correct the...

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. The most common cause of this fault code is low boost. Low boost can be caused by several factors: 1)Leaking charge air cooler2)Damaged charge air piping or hose3)Loose charge air cooler clamps4)Failed intake manifold pressure sensor5)Failed variable geometry turbocharger. NOTE: This fault code will most likely not become active under conditions of the engine being unloaded and in the shop. The engine must be loaded to trip this fault...

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...

Cummins ISB CM850 (2003-06) Fault Code: 2347 (ISB) PID: SID 151 SPN: 611 FMI: 15 Turbocharger compressor outlet temperature – data above normal. High turbocharger compressor outlet temperature has been calculated by the ECM. Possible causes for high turbocharger compressor outlet temperature include: 1)Air intake leaks between the air filter and turbocharger, allowing warm underhood air to enter the turbocharger compressor inlet2)Incorrect turbocharger compressor inlet temperature sensor output3)Incorrect output of sensors used to calculate turbocharger compressor outlet temperature, such as ambient air pressure and turbocharger speed. NOTE: This code will most likely not be active with no load in the...

Cummins ISB CM850 (2003-06) Fault Code: 2347 (ISC) PID: SPN: 2790 FMI: 15 Turbocharger Compressor Outlet Air Temperature (Calculated) – Data Valid but Above Normal Range – least severe level. Possible causes: 1)Air intake leaks allowing hot underhood air to enter the intake system2)Faulty intake manifold pressure readings3)High turbocharger speed readings4)Faulty barometric pressure readings5)Stuck turbocharger control valve6)Stuck variable geometry turbocharger. NOTE: Unless the failure is a failed barometric pressure sensor or intake manifold pressure sensor, this fault code will most likely not be active with no load in the shop. The engine will most likely need to be loaded to...