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. During engine operation, the electronic control module (ECM) monitors the primary speed sensor (crankshaft speed sensor) signal. Fault Code 689 will become active and light the yellow lamp (marine does not use lamps) if the signal from the primary speed sensor is not present or degraded for more than three continuous seconds. Meanwhile, if the primary engine speed sensor signal is not present or is degraded for a moment (less than three...

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. During engine operation, the ECM monitors the secondary speed sensor (camshaft speed sensor) signal. Fault Code 778 will become active and light the yellow lamp (marine does not use lamps) if the signal from the secondary speed sensor is not present or degraded for more than three continuous seconds. If over a period of time, the ECM detects several incidents of a loss of the secondary speed sensor...

Cummins ISB CM850 (2003-06) Fault Code: 234 (Auto) PID: 190 SPN: 190 FMI: 0 Engine Crankshaft Speed/Position – Data Valid But Above Normal Operating Range – Most Severe Level. Engine speed signal indicates engine speed above engine protection limit. Possible causes: 1)External fuel sources drawn into the intake air passage2)Reverse powering (motoring) of the engine3)Tampering of the engine speed/position sensors. Inspect the intake manifold for sources of flammable vapors. Check the turbocharger seals to verify that there are no oil leaks. Inspect the engine speed/position sensors for damage or tampering. The sensor return configuration for Euro 4 ISB engines has...

Cummins ISB CM850 (2003-06) Fault Code: 234 (Marine) PID: 190 SPN: 190 FMI: 0 Engine Crankshaft Speed/Position – Data Valid but Above Normal Operational Range – Most Severe Level. Engine speed signal indicates engine speed above engine protection limit. Possible causes: 1)External fuel sources drawn into the intake air passage2)Reverse powering (motoring) of the engine3)Tampering of the engine speed/position sensors. Inspect the intake manifold for sources of flammable vapors. Check the turbocharger seals to verify that there are no oil leaks. Inspect the engine speed/position sensors for damage or tampering. Possible repairs: 1)Replace the crankshaft engine speed sensor.2)Replace the camshaft...

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. This fault becomes active if the engine is running and the turbocharger speed signal rapidly changes faster than the capabilities of the turbocharger. This could be caused by a bent or missing compressor blade or a damaged compressor wheel. Possible repairs: 1)Replace the turbocharger. 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,...