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PACCAR PX-8 CM2150 (2007-09) Fault Code: 731 PID: SID 064 SPN: 723 FMI: 7 Engine Speed/Position Camshaft and Crankshaft Misalignment – Mechanical System Not Responding Properly or Out of Adjustment. Engine position signal from the engine speed sensor and camshaft position sensor do not match.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

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.

This fault code is logged when there is a mechanical misalignment between the crankshaft engine position sensor and the camshaft engine position sensor.

Possible causes:

1)Engine speed sensor rings that are loose or not aligned correctly
2)Mechanical misalignment.

Possible repairs:

1)Replace the position or speed sensor.
2)Replace the tone wheel.
3)Replace, tighten, or clean the ground wires or connections.
4)Remove and install camshaft to properly align timing marks at TDC.
5)Replace the crankshaft assembly if all steps have been completed and checked again.

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