Cummins ISB CM850 (2003-06) Fault Code: 1992 PID: SPN: 190 FMI: 0 Engine Crankshaft Speed/Position – Data Valid but Above Normal Operational Range – Moderately Severe Level. Engine crankshaft speed/position SIGNAL indicates engine speed above engine protection limit.

This fault code is only applicable to engines powering generator sets.

Possible causes:

1)External fuel sources drawn into the intake air passage
2)Reverse powering (motoring) of the engine
3)Tampering of the engine crankshaft speed/position and engine camshaft 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 crankshaft speed/position and engine camshaft speed/position sensors for damage or tampering.

Possible repairs:

1)Replace the damaged section of harness or damaged engine crankshaft speed/position sensor.
2)Replace the ECM.