Cummins ISX12 CM2250 (2010-12) Fault Code: 731 PID: SID 64 SPN: 723 FMI: 7 Engine Speed/Position Camshaft and Crankshaft Misalignment- Mechanical System Not Responding or Out of Adjustment
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 lobes on 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 to determine the position of the engine by the ECM.
Component Location
The crankshaft position sensor and camshaft prosition sensor location varies with the engine.
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 does not match the camshaft position signal input to the ECM.
Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE light and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
Diesel exhaust fluid injection into the aftertreatment system is disabled.
Active and stationary regeneration of the diesel particulate filter will be disabled.
The EGR valve will be closed.
Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.
Conditions for Clearing the Fault Code
To validate the repair using a Diagnostic Road Test, utilize a route that incorporates both stop-and-go city driving and steady state highway driving. It may be necessary to load the unit for certain diagnostics in the ECM to run.
To validate the repair using a Chassis Dynamometer Test, utilize a routine that incorporates acceleration and motoring events, steady state highway operation, and load. This will simulate normal driving and allow the diagnostics in the ECM to run.
The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
The ECM will turn off the amber CHECK ENGINE lamp after the diagnostic runs and passes.
For On-Board Diagnostic (OBD) engines, the ECM will turn off the MIL after three consecutive trips where the diagnostic runs and passes.
The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.
Shop Talk
The ECM monitors the position of the missing tooth on the crankshaft speed sensor target and the camshaft speed sensor target. If the two positions do not match, the ECM then determines that there is a mechanical misalignment between the two sensors.
Possible causes for this fault code include:
Engine speed sensor rings that are loose or not aligned correctly
Mechanical misalignment.
Possible Cause:
1) Loose Connection or ground wires
2) Engine timing
3) ECM calibration
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