Cummins ISB4.5 CM2150 Fault Code: 115 PID: 190 SPN: 612 FMI: 2 Engine Magnetic Speed/Position Lost Both of Two Signals – Data Erratic, Intermittent, or Incorrect

Engine Magnetic Speed/Position Lost Both of Two Signals – Data Erratic, Intermittent, or Incorrect Circuit Description
The crankshaft position and camshaft position sensors are Hall effect type sensors. The engine control module (ECM) provides a 5 volt supply to the position sensor and a return circuit. As the teeth on the crankshaft speed ring or the dimples in the back of the camshaft gear move past the position sensor, a signal is generated on the position sensor signal circuit. The ECM interprets this signal and converts it to an engine speed. A missing tooth on the crankshaft gear is used by the ECM to determine the position of the engine.

Component Location
Not Applicable

Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is operating.

Conditions for Setting the Fault Codes
The ECM detects that the crankshaft position and camshaft position signal inputs to the ECM are reversed.

Action Taken When the Fault Code is Active
The ECM illuminates the red STOP ENGINE light and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
The ECM detects the reversed sensors and continues to operate.
Conditions for Clearing the Fault Code
To validate the repair, start the engine and let it idle for 1 minute.
The ECM will turn off the red STOP ENGINE light immediately after the diagnostic runs and passes.
The ECM will turn off the MIL after three consecutive ignition cycles that the diagnostic runs and passes.
This fault code and the MIL can also be cleared with INSITE™ electronic service tool.

Shop Talk
This fault code indicates the crankshaft position sensor and the camshaft position sensor wiring harness connectors are reversed.