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Engine Speed/Position Camshaft and Crankshaft Misalignment – Mechanical System Not Responding Properly, or Out of Adjustment
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 731 PID: S064 SPN: 723 FMI: 7/7 LAMP: Amber SRT: |
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. |
Engine will run derated. Hard start and rough idle is possible. |
 ISX – Engine Magnetic Speed/Position
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 ISM – Engine Magnetic Speed/Position
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Circuit Description
The crankshaft position and camshaft position sensors are hall effect type sensors. The electronic control module (ECM) provides a 5 VDC 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
Refer to Procedure 100-002 (Engine Diagrams) in Section E for a detailed component location view.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running.
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 immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.
Shop Talk
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. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
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 for this fault code include:
- Engine speed sensor rings that are loose or not aligned correctly.
- Mechanical misalignment.
Refer to Troubleshooting Fault Code t05-731
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