SPN 612 - FMI 2 (Fault Code 115)

Engine Magnetic Speed/Position Lost Both of Two Signals - Data Erratic, Intermittent, or Incorrect

Engine Camshaft Speed/Position Sensor Circuit

Fault Code: 115
PID(P), SID(S): P190
SPN: 612
FMI: 2/2
Lamp: Red

REASON: The ECM has detected a loss of signal from the camshaft position sensor.

EFFECT: Engine may not start or may be difficult to start.

Circuit Description:
The engine control module (ECM) provides a 5 volt supply to the engine camshaft speed/position sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The camshaft speed/position sensor provides a signal to the ECM on the camshaft speed/position sensor signal circuit. This sensor generates a signal to the ECM as the camshaft speed indicator lobe moves past the sensor. The ECM interprets this signal into an engine speed reading and determines engine position. This sensor is used as a backup sensor if the primary engine crankshaft speed/position signal is lost.

Component Location:
The camshaft position sensor is located below the intake side of the engine in the cylinder head to the right of the ECM.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position and the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected a loss of the camshaft speed/position sensor while the engine was running.
Action Taken When the Fault Code is Active:
• The ECM illuminates the red STOP ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• The fault code status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.
• The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.
• It is necessary to use the "Reset All Faults" command in the recommended Cummins® electronic service tool or equivalent to clear this fault.

Shop Talk:
Possible causes of this fault code include:
• Damaged or malfunctioning camshaft position sensor.

Read More:
SPN 102 - FMI 3 (Fault Code 122)
SPN 190 - FMI 10 (Fault Code 121)


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