SPN 1043 - FMI 11 (Fault Code 496)

SPN1043 FMI11
Engine Speed/Position Sensor #2 (Camshaft) Supply Voltage - Root Cause Not Known

Sensor Supply Circuit

Fault Code: 496
PID(P), SID(S): S221
SPN: 1043
FMI: 11/11
Lamp: Amber

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

EFFECT: Possibly hard to start or low power. Engine could possibly not 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 or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the sensor supply 1 signal voltage was out of range low.

Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK 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 amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• The “Reset All Faults” command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.

Shop Talk:
Possible causes of this fault code include:
• A short circuit to ground in the engine harness
• An open circuit in the engine harness
• Malfunctioning sensor
-Malfunctioning ECM

Read More:
SPN 94 - FMI 3 (Fault Code 546)
SPN 94 - FMI 4 (Fault Code 547)


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